ISO/TR 15608 Material Groups

ISO/TR 15608 Material Group 1.1 e.g. P265GH: Unalloyed Low carbon steel with a specific minimum yield strength R_eH ≤ 275 N/mm^{2 a} and with follow analysis:
C ≤ 0,25%; Si ≤ 0,60%; Mn ≤ 1,8%; Mo ≤ 0,70%^b; S ≤ 0,045%; P ≤ 0,045%; Cu ≤ 0,40%^b; Ni ≤ 0,5%^b; Cr ≤ 0,3%^b; (0,4% for castings; Nb ≤0,06%; V ≤ 0,1%^b; Ti ≤0,05%;

Remarks:
^a In accordance with the specification of steel product standards, R_eH may be replaced by Rp_0,2 or R_t0,5;
^b A higher value is accepted, provided Cr+Mo+Ni+Cu+V ≤ 0,75%

Features of unalloyed low carbon steel such as P265GH

Unalloyed Low carbon steels are those that contain other alloying elements such as manganese, chromium, nickel, vanadium, or titanium in smaller quantities. In terms of quality, they can be with special characteristics in terms of toughness, grain size, formability, yield strength, ductility, cold formability and weldability.
Specified yield strength R_eH ≤ 275 N/mm²

Applications of unalloyed low carbon steel such as P265GH

Due to the moderate carbon content and the specified low alloy constituents, the steels in this material group are suitable for application temperatures up to approx. 300 °C. These steels also have specified strength characteristics such as yield strength or tensile strength. These characteristics make this material group essential in the manufacture of parts and machinery, pressure equipments for the chemical industry, the oil industry and other industries, among others.

For Unalloyed Low carbon steel with specified 275 < R_eH ≤ 360 N/mm²: see Group 1.2

For Unalloyed Low carbon steel with specified R_eH > 360 N/mm²: see Group 1.3

Typical unalloyed low carbon steels in Group 1.1

Name /Grade	Number	Standards	Product	Remarks
P195TR2 P195TR2	1.0108 1.0108	EN 10216-1 EN 10217-1	Seamless tube Welded tube	EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2 & EN 12953-2
P195GH P195GH	1.0348 1.0348	EN 10216-2 EN 10217-2	Seamless tube Welded tube	EN 13445-2 & 12953-2 & EN 12953-2 EN 13445-2 & 12953-2 & EN 12953-2
P215NL P215NL P215NL P215NL TC2	1.0451 1.0451 1.0451 1.0451	EN 10216-4 EN 10217-6 EN 10217-4 EN 10253-2	Seamless tube Submerged arc welded tube Electrical welded tube Fitting	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P235TR2 P235TR2 P235TR2 TC2	1.0255 1.0255 1.0255	EN 10216-1 EN 10217-1 EN 10253-2	Seamles tube Welded tube Fitting	EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2
P265TR2 P265TR2 P265TR2 TC2	1.0259 1.0259 1.0259	EN 10216-1 EN 10217-1 EN 10253-2	Seamles tube Welded tube Fitting	EN 13445-2 & EN 13480-2 & 12953-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P235GH P235GH P235GH P235GH P235GH TC2 P235GH	1.0345 1.0345 1.0345 1.0345 1.0345 1.0345	EN 10028-2 EN 10216-2 EN 10217-2 EN 10217-5 EN 10253-2 EN 10273	Plate Seamles tube Welded tube Submerged arc welded tube Fitting Bar	EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P245GH	1.0352	EN 10222-2	Forging	EN 13445-2 EN 12953: Valves
P250GH	1.0460	EN 10273	Bar	EN 13445-2 & EN 13480-2
P265GH P265GH P265GH P265GH P265GH TC2 P265GH	1.0425 1.0425 1.0425 1.0425 1.0425 1.0425	EN 10028-2 EN 10216-2 EN 10217-2 EN 10217-5 EN 10253-2 EN 10273	Plate Seamless tube Welded tube Submerged arc welded tube Fitting Bar	EN 13445-2 & EN 13480-2 & EN 12953-2 EN 13445-2 & EN 13480-2 & EN 12953-2 EN 12953-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P255QL	1.0452	EN 10216-4	Seamless tube	EN 13445-2 & EN 13480-2
P265NL P265NL P265NL	1.0453 1.0453 1.0453	EN 10216-4 EN 10217-4 EN 10217-6	Seamless tube Electrical welded tube Submerged arc welded tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
L245ME	1.0418	EN ISO 3183	Pipe for gas pipelines	–
L245NE	1.0457	EN ISO 3183	Pipe for gas pipelines	–
P275NH P275NH	1.0487 1.0487	EN 10028-3 EN 10273	Plate Bar	EN 13445-2 & EN 13480-2 & 12953-2 EN 13445-2 & EN 13480-2
P275NL1 P275NL1 P275NL1	1.0488 1.0488 1.0488	EN 10028-3 EN 10216-3 EN 10217-3	Plate Seamles tube Welded tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
GP240GH	1.0619	EN 10213	Steel casting	EN 13445-2 & EN 13480-2 EN 12953: Valves
GP240GR	1.0621	EN 10213	Steel casting	EN 13445-2 & EN 13480-2
P275NL2 P275NL2 P275NL2	1.1104 1.1104 1.1104	EN 10028-3 EN 10216-3 EN 10217-3	Plate Seamles tube Welded tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
G17Mn5	1.1131	EN 10213	Steel casting	EN 13445-2 & EN 13480-2
1008 1008	G10080 G10080	ASTM A-576 ASTM A-1008	Bar Tube	ASME BPVC
1010 1010	G10100 G10080	ASTM A-513 ASTM A-576	Tube Bar	ASME BPVC ASME BPVC
1015 1015 1015	G10150 G10150 G10150	ASTM A-108 ASTM A-519 ASTM A-576	Bar Tube Bar	ASME BPVC ASME BPVC ASME BPVC
1018 1018 CW 1018 HR G10180	G10180 G10180 G10180 G10180	ASTM A-108 ASTM A-519 ASTM A-519 ASTM A-576	Bar Tube Tube Bar	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
1020 1020 CW 1020 CW 1020 HR G1020	G10200 G10200 G10200 G10200 G10200	ASTM A-108 ASTM A-513 ASTM A-519 ASTM A-519 ASTM A-576	Bar Tube Tube Tube Bar	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
1022 CW 1022 HR G10220	G10220 G10220 G10220	ASTM A-519 ASTM A-519 ASTM A-576	Tube Tube Bar	ASME BPVC ASME BPVC ASME BPVC
1025 CW 1025 CW 1025 HR G10250	G10250 G10250 G10250 G10250	ASTM A-513 ASTM A-519 ASTM A-519 ASTM A-576	Tube Tube Tube Bar	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
A –	K01200 K01200	ASTM A-178 ASTM A-179	E.R.W. tube Smls. tube	ASME BPVC ASME BPVC
–	K01201	ASTM A-192	Smls. tube	ASME BPVC
D C	K12037 K12037	ASTM A-633 ASTM A-724	Plate Plate	ASME BPVC ASME BPVC
SA283 A A	K01400 K01400	ASTM A-134 ASTM A-283	Welded pipe Plate	ASME BPVC ASME BPVC
A	K01501	ASTM A-414	Sheet	ASME BPVC
SA285 A A A45	K01700 K01700 K01700	ASTM A-134 ASTM A-285 ASTM A-672	Welded pipe Plate Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
	K01701	ASTM A-662	Plate	ASME BPVC
SA283 B B	K01702 K01702	ASTM A-134 ASTM A-283	Welded pipe Plate	ASME BPVC ASME BPVC
55 C55	K01800 K01800	ASTM A-516 ASTM A-672	Plate Fusion welded pipe	ASME BPVC ASME BPVC
A	K01802	ASTM A-633	Plate	ASME BPVC
– A2 A2	K01807 K01807 K01807	ASTM A-214 ASTM A-556 ASTM A-557	E.R.W. tube Smls. tube E.R.W. tube	ASME BPVC ASME BPVC ASME BPVC
IV	K02009	ASTM A-765	Forging	ASME BPVC
60 CC60 C60	K02100 K02100 K02100	ASTM A-516 ASTM A-671 ASTM A-672	Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
I II	K02104 K02104	ASTM A-524 ASTM A-524	Smls. pipe Smls. pipe	ASME BPVC ASME BPVC
SA285 B B A50	K02200 K02200 K02200	ASTM A-134 ASTM A-285 ASTM A-672	Welded pipe Plate Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
B	K02201	ASTM A-414	Welded pipe	ASME BPVC
B	K02203	ASTM A-662	Plate	ASME BPVC
SA283 C C 60 CB60 B60	K02401 K02401 K02401 K02401 K02401	ASTM A-134 ASTM A-283 ASTM A-515 ASTM A-671 ASTM A-672	Welded pipe Plate Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
65 CC65 C65	K02403 K02403 K02403	ASTM A-516 ASTM A-671 ASTM A-672	Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
65 CC65 C65	K02501 K02501 K02501	ASTM A-516 ASTM A-671 ASTM A-672	Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
A570–30 A570–33 A570–40	K02502 K02502 K02502	ASTM A-211 ASTM A-211 ASTM A-211	Welded pipe Welded pipe Welded pipe	ASME BPVC ASME BPVC ASME BPVC
C	K02503	ASTM A-414	Sheet	ASME BPVC
E, A	K02504	ASTM A-53	Resistance welded pipe	ASME BPVC
D	K02505	ASTM A-414	Sheet	ASME BPVC ASME BPVC ASME BPVC
C	K02007	ASTM A-662	Plate	ASME BPVC
A	K02508	ASTM A-139	Welded pipe	ASME BPVC
A	K02509	ASTM A-135	E.R.W. pipe	ASME BPVC
Ib	K02601	ASTM A-618	Tube	ASME BPVC
SA283 D D	K02702 K02702	ASTM A-134 ASTM A-283	Welded pipe Plate	ASME BPVC ASME BPVC
B WPB 6 FPB WPL6 C2	K03006 K03006 K03006 K03006 K03006 K03006	ASTM A-106 ASTM A-234 ASTM A-333 ASTM A-369 ASTM A-420 ASTM A-556	Smls. pipe Fitting Smls. & welded pipe Forged pipe Fitting Smls. tube	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
–	K11224	ASTM A-562	Plate	ASME BPVC
T1b T1b	K11422 K11422	ASTM A-209 ASTM A-250	Smls. tube E.R.W. tube	ASME BPVC ASME BPVC
–	K11500	ASTM A-587	E.R.W. pipe	ASME BPVC
T1 T1 P1 FP1	K11522 K11522 K11522 K11522	ASTM A-209 ASTM A-250 ASTM A-335 ASTM A-369	Smls. tube E.R.W. tube Smls. pipe Forged pipe	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
A L65 CM-65	K11820 K11820 K11820	ASTM A-204 ASTM A-672 ASTM A-691	Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
C	K12000	ASTM A-633	Plate	ASME BPVC
B L70 CM-70	K12020 K12020 K12020	ASTM A-204 ASTM A-672 ASTM A-691	Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
A H75	K12021 K12021	ASTM A-302 ASTM A-672	Plate Fusion welded pipe	ASME BPVC ASME BPVC
T1a T1a	K12023 K12023	ASTM A-209 ASTM A-250	Smls. tube E.R.W. tube … E.R.W. tube	ASME BPVC ASME BPVC
D C	K12037 K12037	ASTM A-633 ASTM A-724	Plate Plate	ASME BPVC ASME BPVC
F1	K12520	ASTM A-336	Forging	ASME BPVC
F1	K12822	ASTM A-181	Forging	ASME BPVC
CP1	J12521	ASTM A-426	Centrifugal cast pipe	ASME BPVC
WCA	J02502	ASTM A-426	Casting	ASME BPVC
WCC	J02503	ASTM A-216	Casting	ASME BPVC
WCB	J03002	ASTM A-216	Casting	ASME BPVC
LCB WCB	J03003 J03003	ASTM A-352 ASTM A-660	Casting Centrifugal cast pipe	ASME BPVC ASME BPVC
LC1	J12522	ASTM A-352	Casting	ASME BPVC
2	J12523	ASTM A-356	Casting	ASME BPVC
WC1	J12524	ASTM A-217	Casting	ASME BPVC
M 108 M 110 M 112 M 115 M 117	– – – – –	ASTM A-575 ASTM A-575 ASTM A-575 ASTM A-575 ASTM A-575	Bar Bar Bar Bar Bar	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
G10080 G10100 G10120 G10150 G10160 G10170 G10180 G10190 G10200	– – – – – – – – –	ASTM A-576 ASTM A-576 ASTM A-576 ASTM A-576 ASTM A-576 ASTM A-576 ASTM A-576 ASTM A-576 ASTM A-576	Bar Bar Bar Bar Bar Bar Bar Bar Bar	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
–	–	ASTM A-836	Forging	ASME BPVC
CS A CS B DS B	– – –	ASTM A-1008 ASTM A-1008 ASTM A-1008	Sheet Sheet Sheet	ASME BPVC ASME BPVC ASME BPVC
CS B DS B SS 33 SS 36 1 SS 36 2	– – – – –	ASTM A-1011 ASTM A-1011 ASTM A-1011 ASTM A-1011 ASTM A-1011	Sheet Sheet Sheet Sheet Sheet	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
A A25 A25P BM BMO BMS BN BNO BNS BNQ BQO BQS BQR	– – – – – – – – – – – – –	API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L	Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Welded pipe Welded pipe Welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC

FAQs to ISO/TR 15608 Material Group 1.1

Read More

ISO 15614-1: Which range of material groups according to ISO/TR 15608 are qualified?

What are designations for materials such as EN-Material No., Grade, AISI, or UNS?

What are HIC resistant steels?

ISO 15608 Material Group 1.2 : Low carbon steels (C ≤ 0,25%;) with a specific minimum yield strength 275 N/mm² < R_eH ≤ 360 N/mm^{2 a} and with follow analysis:
C ≤ 0,25%; Si ≤ 0,60%; Mn ≤ 1,8%; Mo ≤ 0,70%^b; S ≤ 0,045%; P ≤ 0,045%; Cu ≤ 0,40%^b; Ni ≤ 0,5%^b; Cr ≤ 0,3%^b; (0,4% for castings; Nb ≤0,06%; V ≤ 0,1%^b; Ti ≤0,05%;

Remarks:
^a In accordance with the specification of steel product standards, R_eH may be replaced by R_p0,2 or R_t0,5;
^b A higher value is accepted, provided Cr+Mo+Ni+Cu+V ≤ 0,75%

Features of low carbon steels ISO 15608 material group 1.2

The carbon of low carbon steels is limited with C ≤ 0,25 %. )Non-alloy steels or low carbon steels are those that contain other alloying elements such as manganese, chromium, nickel, vanadium, or titanium in smaller quantities. In terms of quality, they can be with special characteristics in terms of toughness, grain size, formability, yield strength, ductility, cold formability and weldability.
Carbon in low Carbon steels : C ≤ 0,25%
Specified yield strength: 275 < R_eH ≤ 360 N/mm²

Applications of materials in ISO 15608 material group 1.2

Due to the moderate carbon content and the specified low alloy constituents, the steels in this material group are suitable for application temperatures up to approx. 300 °C. These steels also have specified strength characteristics such as yield strength or tensile strength. These characteristics make this material group essential in the manufacture of parts and machinery, pressure equipments for the chemical industry, the oil industry and other industries, among others.

For unalloyed carbon steels with specified R_eH ≤ 275 N/mm²: see Material Group 1.1

For unalloyed carbon steels with specified R_eH > 360 N/mm²: see Material Group 1.3

Typical low carbon steels in ISO 15608 Material group 1.2

Name	Number	Standard	Product	Remarks
P280GH	1.0426	EN 10222-2	Forgings	EN 13445-2 & EN 12953-2
L290ME	1.0429	EN ISO 3183	Pipe for gas pipelines	–
P355GH	1.0473	EN 10028-2 EN 10273	Plate Bar	EN 13445-2 EN 13445-2
P285NH	1.0477	EN 10222-4	Forging	EN 13445-2
P285QH	1.0478	EN 10222-4	Forging	EN 13445-2 & 13480-2
P295GH P295GH	1.0481 1.0481	EN 10028-2 EN 10273	Plate Bar	EN 13445-2 & 13480-2 & 12953-2 EN 13445-2
L290GA	1.0483	EN ISO 3183	Pipe for Pipelines	–
L290NE L290NB L290NE	1.0484 1.0484 1.0484	EN ISO 3183 EN 10208-2 EN 10253-2	Pipe for Pipelines Pipe for Pipelines Fittings	– EN 13445-2 EN 13445-2
P305GH	1.0436	EN 10222-2	Forgings	EN 13445-2
P355N P355N P355N P355N TC2	1.0562 1.0562 1.0562 1.0562	EN 10028-3 EN 10216-3 EN 10217-3 EN 10253-2	Plate Seamless Tube Welded Tube Fitting	EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2
P355NH P355NH P355NH P355NH P355NH P355NH TC2	1.0565 1.0565 1.0565 1.0565 1.0565 1.0565	EN 10028-3 EN 10273 EN 10216-3 EN 10217-3 EN 10222-4 EN 10253-2	Plate Bar Seamless Tube Welded Tube Forging Fitting	EN 13445-2 & 13480-2 & 12953-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 EN 13445-2
P355GH	1.0473 1.0473	EN 10028-2 EN 10273	Plate Bar	EN 13445-2 & 13480-2 & 12953-2 EN 13445-2 & 13480-2
P355NL1 P355NL1 P355NL1 P355NL1 TC2	1.0566 1.0566 1.0566 1.0566	EN 10028-3 EN 10216-3 EN 10217-3 EN 10253-2	Plate Seamless Tube Welded Tube Fitting	EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2
P355QH	1.0571	EN 10222-4	Forging	EN 13445-2 & EN 13480-2
L360NE L360NB L360NE	1.0582 1.0582 1.0582	EN ISO 3183 EN 10208-2 EN 10253-2	Pipe for pipelines Pipe for pipelines Fittings	– EN 13445-2 EN 13445-2
L360ME L360MB	1.0578 1.0578	EN ISO 3183 EN 10208-2	Pipe for pipelines Pipe for Pipelines	– –
L360QE L360QB L360QE	1.8948 1.8948 1.8948	EN ISO 3183 EN 10208-2 EN 10253-2	Pipe for pipelines Pipe for pipelines Fitting	– – –
GP280GH	1.0625	EN 10213	Steel casting	EN 13445-2 & EN 13480-2
P355NL2 P355NL2 P355NL2 P355NL2	1.1106 1.1106 1.1106 1.1106	EN 10028-3 EN 10216-3 EN 10217-3 EN 10253-2	Plate Seamless Tube Welded Tube Fittings	EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2
18MnMo4-5	1.5414	EN 10028-2	Plate	EN 13445-2 & EN 13480-2
15MnMoV4-5	1.5402	EN 10222-2	Forging	EN 13445-2
20MnNb5	1.0471	EN 10216-2	Seamless Tube	EN 13445-2 & EN 13480-2
16Mo3 16Mo3 16Mo3 16Mo3 16Mo3 16Mo3 TC2 P1 F1 WP1	1.5415 1.5415 1.5415 1.5415 1.5415 1.5415 – – –	EN 10028-2 EN 10273 EN 10216-2 EN 10217-5 EN 10222-2 EN 10253-2 ASTM A335 ASTM A182 ASTM A234	Plate Bar Seamless Tube Submerged arc welded tubes Forgings Fittings Seamless and welded tubes Forgings Fittings	EN 13445-2 & 13480-2 & 12953-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 & 12953-2 EN 13445-2 & 13480-2 EN 13445-2 & 13480-2 & EN 12953-2 EN 13445-2 & 13480-2 ASME BPVC ASME BPVC ASME BPVC
G18Mo5	1.5422	EN 10213	Steel casting	EN 13445-2
G20Mn5	1.6220	EN 10213	Steel casting	EN 13445-2
P355M	1.8821	EN 10028-5	Plate	EN 13445-2 & 13480-2
P355ML1	1.8832	EN 10028-5	Plate	EN 13445-2 & 13480-2
P355ML2	1.8833	EN 10028-5	Plate	EN 13445-2 & 13480-2
P355Q	1.8866	EN 10028-6	Plate	EN 13445-2 & 13480-2
P355QH	1.8867	EN 10028-6 EN 10273	Plate Bar	EN 13445-2 & 13480-2 EN 13445-2 & 13480-2
P355QL1	1.8868	EN 10028-6	Plate	EN 13445-2 & 13480-2
P355QL2	1.8889	EN 10028-6	Plate	EN 13445-2 & 13480-2
1025 CW 1025 CW 1025 CW G10250	G10250 G10250 G10250 G10250	ASTM A-513 ASTM A-519 ASTM A-519 ASTM A-579	Tube Tube Tube Bar	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
L1, Cl. 1 L1, Cl. 2	K02302 K02302	ASTM A-707 ASTM A-707	Forging Forging	ASME BPVC ASME BPVC
C	K02705	ASTM A-500	Smls. & welded tube	ASME BPVC
B	K03000	ASTM A-500	Smls. & welded tube	ASME BPVC
A B	K03000 K03000	ASTM A-501 ASTM A-501	Smls. & welded tube Smls. & welded tube	ASME BPVC ASME BPVC
A B C L70 CM–70	K12020 K12020 K12020 K12020 K12020	ASTM A-204 ASTM A-204 ASTM A-204 ASTM A-672 ASTM A-691	Plate Plate Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
B H80	K12022 K12022	ASTM A-302 ASTM A-672	Plate Fusion welded pipe	ASME BPVC ASME BPVC
C L75 CM-75	K12320 K12320 K12320	ASTM A-204 ASTM A-672 ASTM A-691	Plate Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
Cl. 1 Cl. 2 Cl. 3 CD70 CD80 D70 D80 CMSH–70 CMSH–80	K12437 K12437 K12437 K12437 K12437 K12437 K12437 K12437 K12437	ASTM A-537 ASTM A-537 ASTM A-537 ASTM A-671 ASTM A-671 ASTM A-672 ASTM A-672 ASTM A-691 ASTM A-691	Plate Plate Plate Fusion welded pipe Fusion welded pipe Fusion welded pipe Fusion welded pipe Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC #ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
L3, Cl. 1 L3, Cl. 2 L3, Cl. 3	K12510 K12510 K12510	ASTM A-707 ASTM A-707 ASTM A-707	Forging Forging Forging	ASME BPVC ASME BPVC ASME BPVC
II	K12609	ASTM A-618	Tube	ASME BPVC
III	K12700	ASTM A-618	Tube	ASME BPVC
42 50	– –	ASTM A-572 ASTM A-572	Plate Plate	ASME BPVC ASME BPVC
T3, 50 T7, 50	– –	ASTM A-656 ASTM A-656	Plate Plate	ASME BPVC ASME BPVC
A, Cl. 1	–	ASTM A-841	Fitting	ASME BPVC
WPHY 42 WPHY 46 WPHY 52	– – –	ASTM A-860 ASTM A-860 ASTM A-860	Smls. & welded fittings Smls. & welded fittings Smls. & welded fittings	ASME BPVC ASME BPVC ASME BPVC
–	–	ASTM A-992	Shape	ASME BPVC
HSLAS 45 Cl. 1 HSLAS 45 Cl. 2 HSLAS 50 Cl. 1 HSLAS 50 Cl. 2	– – – –	ASTM A-1011 ASTM A-1011 ASTM A-1011 ASTM A-1011	Sheet Sheet Sheet Sheet	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
50	–	ASTM A-1066	Plate
X42M X42MO X42MS X42N X42NO X42NS X42Q X42QO X42QS X42R X46M X46MO X46MS X46N X46NO X46NS X46Q X46QO X46QS X52M X52MO X52MS X52N X52NO X52NS X52Q X52QO X52QS	– – – – – – – – – – – – – – – – – – – – – – – – – – – –	API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L	Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC

FAQs to Low carbon steels ISO/TR 15608 Material Group 1.2

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ISO 15614-1: Which range of material groups according to ISO 15608 are qualified?

What are designations for materials such as EN-Material No., Grade, AISI, or UNS?

What are HIC resistant steels?

ISO/TR 15608 Group 1.3: Normalised fine grain steels with a specific minimum yield strength R_eH > 360 N/mm^{2 a} and with follow analysis:
C ≤ 0,25%; Si ≤ 0,60%; Mn ≤ 1,8%; Mo ≤ 0,70%^b; S ≤ 0,045%; P ≤ 0,045%; Cu ≤ 0,40%^b; Ni ≤ 0,5%^b; Cr ≤ 0,3%^b; (0,4% for castings; Nb ≤0,06%; V ≤ 0,1%^b; Ti ≤0,05%;

Remarks:
^a In accordance with the specification of steel product standards, R_eH may be replaced by Rp_0,2 or R_t0,5;
^b A higher value is accepted, provided Cr+Mo+Ni+Cu+V ≤ 0,75%

Features of normalised fine grain steels ISO/TR 15608 material group 1.3

Non-alloy steels or carbon steels are those that contain other alloying elements such as manganese, chromium, nickel, vanadium, or titanium in smaller quantities. In terms of quality, they can be with special characteristics in terms of toughness, grain size, formability, yield strength, ductility, cold formability and weldability.
Specified Carbon: C ≤ 0,25%
Specified yield strength: R_eH > 360 N/mm²
Delivery condition: Normalised

Applications of normalised fine grain steels ISO/TR 15608 material group 1.3

Due to the moderate carbon content and the specified low alloy constituents, the steels in this material group are suitable for application temperatures up to approx. 300 °C. These steels also have specified strength characteristics such as yield strength or tensile strength. These characteristics make this material group essential in the manufacture of parts and machinery, pressure equipments for the chemical industry, the oil industry and other industries, among others.

For unalloyed carbon steels with specified R_eH ≤ 275 N/mm²: see Group 1.1

For unalloyed carbon steels with specified 275 < R_eH ≤ 360 N/mm²: see Group 1.2

Typical materials of normalised fine grain steels ISO/TR 15608 material group 1.3

Name	Number	Standard	Product	Remarks
8MoB5-4	1.5450	EN 10216-2	Seamless tube	EN 13445-2 & EN 13480-2
P460NL1 P460NL1 P460NL1	1.8915 1.8915 1.8915	EN 10028-3 EN 10216-3 EN 10217-3	Plate Seamless tube Welded tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P460NL2 P460NL2 P460NL2	1.8918 1.8918 1.8918	EN 10028-3 EN 10216-3 EN 10217-3	Plate Seamless tube Welded tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P460N P460N	1.8905 1.8905	EN 10216-3 EN 10217-3	Seamless tube Welded tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P420NH	1.8932	EN 10222-4	Forging	EN 13445-2 & EN 13480-2
P460NH P460NH P460NH P460NH	1.8935 1.8935 1.8935 1.8935	EN 10028-3 EN 10216-3 EN 10217-3 EN 10273	Plate Seamless tube Welded tube Bar	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
L415NE L415NB L415NE	1.8972 1.8972 1.8972	EN ISO 3183 EN 10208-2 EN 10253-2	Pipe for pipeline Pipe for pipeline Fitting	– – –
X56N X60N	– –	API Spec 5L API Spec 5L	Pipe for pipeline Pipe for pipeline	ASME BPVC ASME BPVC
HSLAS 55 Cl. 1 HSLAS 55 Cl. 2 HSLAS 60 Cl. 1 HSLAS 60 Cl. 2 SS55 SS60	– – – –	ASTM A-1011 ASTM A-1011 ASTM A-1011 ASTM A-1011 ASTM A-1011 ASTM A-1011	Sheet Sheet Sheet Sheet Sheet Sheet	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC

FAQs to ISO/TR 15608 Material Group 1.3

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ISO 15614-1: Which range of material groups according to ISO/TR 15608 are qualified?

What are designations for materials such as EN-Material No., Grade, AISI, or UNS?

What are HIC resistant steels?

Weathering steels are listed in ISO/TR 15608 material group 1.4 and are specified improved atmospheric corrosion resistance whose analysis may exceed the requirements for the single elements as indicated in the other groups (1.1, 1.2 and 1.3 see below)

What are weathering steels ISO/TR 15608 material group 1.4?

Steels that are chemically formulated to develop a protective patina layer – rust-like in appearance – that eliminates the need for paint. The dense oxide patina layer of weathered steel seals it off from the atmosphere. If a steel panel is scratched, its patina will self-heal. The steel is only not protected against further corrosion: it also delivers a unique finish that is an aesthetically pleasing – a warm, dark-brown, textured appearance that needs low or no maintenance.

The key elements in weathering steels are small amounts of copper, chromium, nickel, silicon, and phosphorus. These elements, when exposed to alternating wet and dry conditions, develop the protective oxide layer – the weathering steel’s patina.

Weathering steels are easily weldable.

For unalloyed carbon steels with specified  R_eH ≤ 275 N/mm²: see Group 1.1
For unalloyed carbon steels with specified 275 < R_eH ≤ 360 N/mm²: see Group 1.2
For unalloyed carbon steels with specified  R_eH > 360 N/mm²: see Group 1.3

Typical weathering steels ISO/TR 15608 material group 1.4

Name/Grade	Number	Standard	Product	Remarks/ Trade Marks
S235J0W	1.8958	EN 10025-5	Plate	structural steels
S235J2W	1.8961	EN 10025-5	Plate	structural steels
S355J0W	1.8959	EN 10025-5	Plate	structural steels
S355J2W	1.8965	EN 10025-5	Plate	structural steels
S355J2W+M		EN 10025-5	Plate	structural steels
S355J0WP	1.8945	EN 10025-5	Plate	structural steels
S355J2WP	1.8946	EN 10025-5	Plate	structural steels
S355K2W	1.8967	EN 10025-5	Plate	structural steels
S420J2W+N		EN 10025-5	Plate	structural steels
S420J2W+M		EN 10025-5	Plate	structural steels
S460J2W+M		EN 10025-5	Plate	structural steels
A A	K11430 K11430	ASTM A-588 ASTM A-588	Plate Bar	ASME BPVC ASME BPVC
B B	K12043 K12043	ASTM A-588 ASTM A-588	Plate Bar & Shape	ASME BPVC ASME BPVC

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ISO 15614-1: Which range of material groups according to ISO/TR 15608 are qualified?

What are designations for materials such as EN-Material No., Grade, AISI, or UNS?

What are HIC resistant steels?

ISO/TR 15608 Material Group 2.1 : Thermomechanically treated fine-grain steels and cast steels with a specific minimum yield strength 360 < R_eH ≤ 460 N/mm².

Thermomechanically steels (TM) rolled fine-grain structural steels is characterised by a high minimum yield strength R_eH by good weldability.

What is the thermomechnical (TM) process?

Exceptionally low alloying-element contents, expressed in low carbon equivalents, assure excellent weldability and high resistance to brittle cracking.
Thermomechanical rolling serves the purpose systematically adjusting its mechanical properties. This is a controlled process, extending from slab reheating, via rolling, up to and including (accelerated) cooling and, where necessary, tempering. The essential effects of thermomechanical rolling are based on micro-alloying with, for example, Nb. The main aim of all mechanisms used in thermomechanical rolling is the attainment of the finest possible grain, this being the necessary basis for the combination of high mechanical strength and toughness with only low alloying-element contents.

Application of thermomechanical treated fine-grain steels ISO/TR 15608 Material Group 2.1

Thermomechanically treated fine-grain steels(TMsteels) are used above all for highly stressed welded structures in the construction of pressure equipments (P…) and steel structures (S…).
The cryogenic grades P…ML are available for special applications at temperatures below -20 °C.

For thermomechanically treated fine-grain steels with specified R_eH > 460 N/mm²: see Group 2.2

Typical thermomechanically treated fine-grain steels ISO/TR 15608 Material Group 2.1

Name/Grade	Number	Standard	Product	Remarks
S420M	1.8825	EN 10025-4	Plate	structural steels
S420ML	1.8836	EN 10025-4	Plate	structural steels
S460M	1.8827	EN 10025-4	Plate	structural steels
S460ML	1.8838	EN 10025-4	Plate	structural steels
P420M	1.8824	EN 10028-5	Plate	EN 13445-2 & EN 13480-2
P420ML1	1.8835	EN 10028-5	Plate	EN 13445-2 & EN 13480-2
P420ML2	1.8828	EN 10028-5	Plate	EN 13445-2 & EN 13480-2
P460M	1.8826	EN 10028-5	Plate	EN 13445-2 & EN 13480-2
P460ML1	1.8837	EN 10028-5	Plate	EN 13445-2 & EN 13480-2
P460ML2	1.8831	EN 10028-5	Plate	EN 13445-2 & EN 13480-2
L415ME	1.8973	EN ISO 3183	Pipe for pipelines	–
L450ME	1.8975	EN ISO 3183	Pipe for pipelines	–
50 60	– –	ASTM A-1066 ASTM A-1066	Plate Plate	ASME BPVC ASME BPVC
X56M X56MO A56MS X60M X60MO A60MS	– – – – – –	API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L	Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC

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FAQs to ISO/TR 15608 Material Group 2.1

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ISO 15614-1: Which range of material groups according to ISO/TR 15608 are qualified?

What are designations for materials such as EN-Material No., Grade, AISI, or UNS?What are HIC resistant steels?

What are HIC resistant steels?

ISO/TR 15608 Material Group 2.2: Thermomechanically treated fine-grain steels (TM steel) and cast steels with a specific minimum yield strength R_eH > 460 N/mm².

Thermomechanically steels (TM) rolled fine-grain structural steels are characterised at a high yield strength by good weldability.

Thermomechanically steels (TM) rolled fine-grain structural steels is characterised by a high minimum yield strength R_eH by good weldability.

What is the thermomechnical process for fine grain steel?

Exceptionally low alloying-element contents, expressed in low carbon equivalents, assure excellent weldability and high resistance to brittle cracking.
Thermomechanical rolling serves the purpose systematically adjusting its mechanical properties. This is a controlled process, extending from slab reheating, via rolling, up to and including (accelerated) cooling and, where necessary, tempering. The essential effects of thermomechanical rolling are based on micro-alloying with, for example, Nb. The main aim of all mechanisms used in thermomechanical rolling is the attainment of the finest possible grain, this being the necessary basis for the combination of high mechanical strength and toughness with only low alloying-element contents.

Application of thermomechanical treated fine-grain steel ISO/TR 15608 Material Group 2.2

Thermomechanical treated fine-grain steels(TMsteels)are used above all for highly stressed welded structures in the construction of pressure equipments (P…) and steel structures (S…).
The cryogenic grades P…ML are available for special applications at temperatures below -20 °C.

For thermomechanical treated fine-grain steels with specified 360 < R_eH ≤ 460 N/mm²: see Group 2.1

Typical materials in group 2.2

Name	Number	Standard	Product	Remarks/ Trade Mark
L485ME	1.8977	EN ISO 3183	Pipe for Gas pipeline	–
L555ME	1.8978	EN ISO 3183	Pipe for Gas pipeline	–
T3, 70 T3, 80 T7, 70 T8, 80	– – – –	ASTM A-656 ASTM A-656 ASTM A-656 ASTM A-656	Plate Plate Plate Plate	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
X70M X70MO X70MS X80M X80MO	– – – – –	API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L	Pipe for pipeline Pipe for pipeline Pipe for pipeline Pipe for pipeline Pipe for pipeline	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC
S500M		EN 10025-4	Plate	structural steels
S500ML		EN 10025-4	Plate	structural steels
S550M		EN 10025-4	Plate	structural steels
S550ML		EN 10025-4	Plate	structural steels
S690M		EN 10025-4	Plate	structural steels
S690ML		EN 10025-4	Plate	structural steels

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FAQs to ISO/TR 15608 Material Group 2.2

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ISO 15614-1: Which range of material groups according to ISO/TR 15608 are qualified?

What are designations for materials such as EN-Material No., Grade, AISI, or UNS?What are HIC resistant steels?

ISO 15614-1: Which range of material groups according to ISO/TR 15608 are qualified?

What are HIC resistant steels?

High strength low alloy steel

ISO/TR 15608 Material Group 3.1: Quenched and tempered (QT) fine-grain high strength low alloy steel with a specific minimum yield strength 360 < R_eH ≤ 690 N/mm².

What is the quenched and tempering (QT) process of high strength low alloy steel?

Quenching and tempering is a heat-treatment method for high strength low alloy steel. Quenching and tempering consists of a two-stage heat-treatment process.
Stage 1 includes hardening, in which the plate is austenitised to approximately 900°C and then quickly cooled. The material is water-quenched in a quench unit, in which the plate is clamped to avoid warpage.
Stage 2 consists of tempering the material to obtain the desired material properties. Quenching and tempering achieves an extremely fine-grained and homogeneous microstructure. Quenched and tempered steel is characterised by high strength and good ductility.

Weldability of high strength low alloy steels ISO/TR 15608 Material Group 3.1

The high-strength tempered materials are generally weldable. However, certain requirements must be met during welding with regard to heat input and controlled cooling in the heat-affected zone and the use of hydrogen-reduced weld metal.

Normally, materials up to a wall thickness of 15 – 20 mm can usually be welded without preheating.

When welding high strength steels, it should be noticed that that a tempering effect occurs due to the heat input during welding, which influences the properties of the base material. The temperature-time cycles during welding have a significant effect on the mechanical properties of a welded joint and the heat effect zones. It is understood, that the t8/5-time is sufficient to describe the temperature-time characteristics. t8/5 is the cooling time from 800°C to 500°C and describes the cooling conditions of an individual weld pass for the weld metal and the corresponding heat affected zone (HAZ). t8/5 depends on the heat input during welding, the plate temperature (or interpass temperature), the shape factor (geometry) and on plate thickness if two dimensional heat flow occurs which is generally the case for thin plates. To achieve satisfactory weld metal properties the welding parameters must be limited with increasing yield strength. For example acceptable properties for an P690QL1 steel are normally obtained with cooling times between 5 s and 20 s. For lower cooling times the hardness of the heat affected zone may exceed limiting values with the risk of introducing cracks.

The hydrogen content of the consumables H2 has a significant influence on the preheating temperature. In order to reduce the risk of hydrogen-induced cracking the preheating temperature must be increased with growing hydrogen content.

Flame straightening of high strength low alloy steels ISO/TR 15608 Material Group 3.1

The maximum recommended temperatures for Flame straightening is usually < 550°C for quenched and tempered steels.

Quenched and tempered (QT) fine-grain steels with a specific minimum yield strength R_eH > 690 N/mm²: see Group 3.2

Typical materials in ISO/TR 15608 material group 3.1

Name/Grad	Number	Standard	Product	Remarks/Trade Mark
G20Mn5	1.5419	EN 10213	Cast	EN 13445-2 & EN 13480-2
20MnMoNi4-5	1.6311	EN 10028-2	Plate	EN 13445-2 & EN 13480-2
15NiCuMoNb5-6-4 15NiCuMoNb5-6-4	1.6368 1.6368	EN 10028-2 EN 10216-2	Plate Smls. tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
L415QE L415QE	1.8947 1.8947	EN ISO 3183 EN 10253-2	Pipe for natural gas pipeline Fitting	– –
L450QE L450QE	1.8952 1.8952	EN ISO 3183 EN 10253-2	Pipe for natural gas pipeline Fitting	– –
L485QE L485QE	1.8955 1.8955	EN ISO 3183 EN 10253-2	Pipe for natural gas pipeline Fitting	– –
L550QE	1.8957	EN ISO 3183	Pipe for natural gas pipeline	–
P460Q	1.8870	EN 10028-6	Plate	EN 13445-2 & EN 13480-2
P460QH	1.8871 1.8871	EN 10028-6 EN 10273	Plate Bar	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P460QL1	1.8872	EN 10028-6	Plate	EN 13445-2 & EN 13480-2
P460QL2	1.8864	EN 10028-6	Plate	EN 13445-2 & EN 13480-2
P500Q	1.8873	EN 10028-6	Plate	EN 13445-2 & EN 13480-2
P500QH P500QH	1.8874 1.8874	EN 10028-6 EN 10273	Plate Bar	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P500QL1	1.8875	EN 10028-6	Plate	EN 13445-2 & EN 13480-2
P500QL2	1.8865	EN 10028-6	Plate	EN 13445-2 & EN 13480-2
P620QH	1.8877	EN 10216-3	Smls. tube	EN 13445-2 & EN 13480-2
S690Q	1.8931	EN 10025-6	Plate	MAXIL® 690
P690Q	1.8879 1.8879	EN 10028-6 EN 10216-3	Plate Smls. tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
S690QL	1.8928	EN 10025-6	Plate	MAXIL® 690QL
P690QH P690QH P690QH	1.8880 1.8880 1.8880	EN 10028-6 EN 10216-3 EN 10273	Plate Smls. tube Bar	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
S690QL1	1.8988	EN 10025-6	Plate	MAXIL® 690QL1
P690QL1 P690QL1	1.8881 1.8881	EN 10028-6 EN 10216-3	Plate Smls. tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P690QL2 P690QL2	1.8888 1.8888	EN 10028-6 EN 10216-3	Plate Smls. tube	EN 13445-2 & EN 13480-2 EN 13445-2 & EN 13480-2
P620Q	1.8876	EN 10216-3	Smls. tube	EN 13445-2 & EN 13480-2
P620QL	1.8890	EN 10216-3	Smls. pipe	EN 13445-2 & EN 13480-2
P420QH	1.8936	EN 10224-4	Forging	EN 13445-2 & EN 13480-2
F F	K11576 K11576	ASTM A–517 ASTM A-592	Plate Forging	ASME BPVC ASME BPVC
B B	K11630 K11630	ASTM A–514 ASTM A-517	Plate Forging	ASME BPVC ASME BPVC
E	K11695	ASTM A–592	Forging	ASME BPVC
A A A	K11856 K11856 K11856	ASTM A–514 ASTM A-517 ASTM A–592	Plate Forging Forging	ASME BPVC ASME BPVC ASME BPVC
3, Cl. 1 3, Cl. 2	K12042 K12042	ASTM A-508 ASTM A-508	Forging Forging	ASME BPVC ASME BPVC
A, Cl. 1 A, Cl. 2 A, Cl. 3 J100	K12521 K12521 K12521 K12521	ASTM A-533 ASTM A-533 ASTM A-533 ASTM A-672	Plate Plate Plate Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
D, Cl. 1 D, Cl. 2 D, Cl. 3	K12529 K12529 K12529	ASTM A-533 ASTM A-533 ASTM A-533	Plate Plate Plate	ASME BPVC ASME BPVC ASME BPVC
B, Cl. 1 B, Cl. 2 B, Cl. 3	K12539 K12539 K12539	ASTM A-533 ASTM A-533 ASTM A-533	Plate Plate Plate	ASME BPVC ASME BPVC ASME BPVC
C, Cl. 1 C, Cl. 2 C, Cl. 3 C, Cl. 4	K12554 K12554 K12554 K12554	ASTM A-533 ASTM A-533 ASTM A-533 ASTM A-533	Plate Plate Plate Plate	ASME BPVC ASME BPVC ASME BPVC ASME BPVC
2, Cl. 1 2, Cl. 2	K12766 K12766	ASTM A-508 ASTM A-508	Forging Forging	ASME BPVC ASME BPVC
E E	K21604 K21604	ASTM A–514 ASTM A–517	Plate Plate	ASME BPVC ASME BPVC
P P	K21650 K21650	ASTM A–514 ASTM A–517	Plate Plate	ASME BPVC ASME BPVC
4N, Cl. 1 4N, Cl. 2 4N, Cl. 3	K22375 K22375 K22375	ASTM A-508 ASTM A-508 ASTM A-508	Forging Forging Forging	ASME BPVC ASME BPVC ASME BPVC
B, Cl. 1 B, Cl. 2 B, Cl. 3	K42339 K42339 K42339	ASTM A-543 ASTM A-543 ASTM A-543	Plate Plate Plate	ASME BPVC ASME BPVC ASME BPVC
5, Cl. 1 5, Cl. 2	K42365 K42365	ASTM A-508 ASTM A-508	Forging Forging	ASME BPVC ASME BPVC ASME BPVC
Q	–	ASTM A–514	Plate	ASME BPVC
C, Cl. 1 C, Cl. 2 C, Cl. 3	– – –	ASTM A-543 ASTM A-543 ASTM A-543	Plate Plate Plate	ASME BPVC ASME BPVC ASME BPVC
J80 J90	– –	ASTM A-672 ASTM A-672	Fusion welded pipe Fusion welded pipe	ASME BPVC ASME BPVC ASME BPVC
4, Cl. A 4, Cl. B 4, Cl. E	J13047 J13047 J13047	ASTM A-487 ASTM A-487 ASTM A-487	Casting Casting Casting	ASME BPVC ASME BPVC ASME BPVC
X56Q X56QO X56QS X60Q X60QO X60QS X65Q X65QO X65QS X70Q X70QO X70QS X80Q X80QO	– – – – – – – – – – – – – –	API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L	Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe Smls. & welded pipe	ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC

ISO/TR 15608 Material Group 3.2: Quenched and tempered (QT) fine-grain high strength steels with a specific minimum yield strength R_eH > 690 N/mm².

What is the quenched and tempering (QT) process of high strength steels?

Quenching and tempering is a heat-treatment method for high strength low alloy steel. Quenching and tempering consists of a two-stage heat-treatment process. 
Stage 1 includes hardening, in which the plate is austenitised to approximately 900°C and then quickly cooled. The material is water-quenched in a quench unit, in which the plate is clamped to avoid warpage. 
Stage 2 consists of tempering the material to obtain the desired material properties. Quenching and tempering achieves an extremely fine-grained and homogeneous microstructure. Quenched and tempered steel is characterised by high strength and good ductility.

Weldability of high strength steels ISO/TR 15608 Material Group 3.2

The high-strength tempered materials are generally weldable. However, certain requirements must be met during welding with regard to heat input and controlled cooling in the heat-affected zone and the use of hydrogen-reduced weld metal

When welding high strength steels, it should be noticed that that a tempering effect occurs due to the heat input during welding, which influences the properties of the base material. The temperature-time cycles during welding have a significant effect on the mechanical properties of a welded joint and the heat effect zones. It is understood, that the t8/5-time is sufficient to describe the temperature-time characteristics. t8/5 is the cooling time from 800°C to 500°C and describes the cooling conditions of an individual weld pass for the weld metal and the corresponding heat affected zone (HAZ). t8/5 depends on the heat input during welding, the plate temperature (or interpass temperature), the shape factor (geometry) and on plate thickness if two dimensional heat flow occurs which is generally the case for thin plates. To achieve satisfactory weld metal properties the welding parameters must be limited with increasing yield strength. For example acceptable properties for an P960QL steel are normally obtained with cooling times between 5 s and 20 s. For lower cooling times the hardness of the heat affected zone may exceed limiting values with the risk of introducing cracks.

The hydrogen content of the consumables H2 has a significant influence on the preheating temperature. In order to reduce the risk of hydrogen-induced cracking the preheating temperature must be increased with growing hydrogen content.

Flame straightening of high strength steels ISO/TR 15608 Material Group 3.2

The maximum recommended temperatures for flame straightening is usually 550°C for quenched and tempered steels.

Quenched and tempered (QT) fine-grain steels with a specific minimum yield strength 460 < R_eH ≤ 690 N/mm²: see Group 3.1

Typical materials in group 3.2

Name / Grade	Number	Standard	Product	Remarks
S700MC	1.8974	EN 10149-2	Plate	for cold forming
S900MC	1.8798	EN 10149-2	Plate	for cold forming
S690MC	1.8799	EN 10149-2	Plate	for cold forming
S890Q	1.8940	EN 10025-6	Plate	structural steels
S890QL	1.8983	EN 10025-6	Plate	structural steels
S890QL1	1.8925	EN 10025-6	Plate	structural steels
S960Q	1.8941	EN 10025-6	Plate	structural steels
S960QL	1.8933	EN 10025-6	Plate	structural steels
A, Cl. 1 A, Cl. 2 A, Cl. 3	K12521 K12521 K12521	ASTM A-533 ASTM A-533 ASTM A-533	Plate Plate Plate	ASME BPVC ASME BPVC ASME BPVC
J100	K12521	ASTM A-672	Fusion welded pipe	ASME BPVC

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What are HIC resistant steels?

ISO/TR 15608 Material Group 4.1: HSLA steel – Low vanadium alloyed Cr-Mo-(Ni) steels with Mo ≤ 0,7 %, V ≤ 0,1 %, Cr ≤ 0,3 % and Ni ≤ 0,7 %

Features of high strength low-allow steels (HSLA steel) material group 4.1

This group contain high strength low-alloy steels (HSLA) with specified yield strength (see below) with good toughness. High strength low-alloy steel provides better mechanical properties compared to carbon steels. Generally speaking, grain size is reduced to reduce pearlite structure, increasing the material’s yield strength. Typical elements that are added to achieve this are titanium, copper, niobium and vanadium. The carbon content of HSLA steel can be anywhere between 0.05 and 0.25% (in mass content) in order to retain formability and weldability.  Other elements include, but are not limited to, nickel, chromium, molybdenum and calcium. However, as low-alloy steels, the combined amount of alloying elements (excluding carbon) does mostly not exceed the limit of 2% in mass content.
Typical applications of HSLA steel: Cryogenic fluid transportation or refrigeration systems.

Low vanadium alloyed Cr-Mo-(Ni) steels with higher content of chromium and nickel: see Group 4.2

Typical materials in group 4.1

Name/Grade	Number	Standard	Product	Remarks
10MnMoNi5-5	1.6308	EN 10222-2	Forging	EN 13445-2 & EN 13480-2
15MnCrMoNiV5-3	1.6920	EN 10222-2	Forging	EN 13445-2 & EN 13480-2
4	K11267	ASTM A-333	Smls. & welded pipe	ASME BPVC
3, Cl. 1 3, Cl. 2	K12045 K12045	ASTM A-541 ASTM A-541	Forging Forging	ASME BPVC ASME BPVC
LF6, Cl. 2 E C	K12202 K12202 K12202	ASTM A-350 ASTM A-633 ASTM A-737	Forging Plate Plate	ASME BPVC ASME BPVC ASME BPVC
C	K12524	ASTM A-225	Plate	ASME BPVC
8620	G86200	ASTM A-108	Bar	ASME BPVC