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ISO/TR 15608 Material Group 10.1

ISO/TR 15608 Material Group 10.1: Austenitic ferritic stainless steels (Standard Duplex) with Cr ≤ 24,0 % and Ni > 4 %

Standard Duplex Steels ISO/TR 15608 Material Group 10.1

The duplex grades are used widely across all industry sectors. The primary factors that drive the use of duplex stainless steels are their improved stress corrosion cracking resistance and the potential to reduce cross sections in high-stress or high-pressure applications and tank construction. As with the other stainless steel families, the duplex grades have a range of corrosion resistance and can be divided into subgroups, depending on alloying content.

The standard duplex 2205 typically contain 21-25% chromium, 2-3% molybdenum and 0.15% nitrogen.  Grades in this category are used widely across all industry sectors and 2205 (S31803/S32205) has become by far the most widely used duplex grade. The 2205 grade has a yield strength that is more than twice that of Type 316 and a pitting and crevice corrosion resistance that is similar to Type 904L austenitic stainless steel.

An empirical relationship called the Pitting Resistance Equivalent Number (PREN) has been developed to relate a stainless steels composition to its relative pitting resistance in chloride solutions.

For comparison: Austenitic steels (PERN = 24-25); Lean Duplex steels (PREN=22-27), Standard Duplex steels (PREN =28-35); Super Duplex (PREN = 39-45); Hyper Duplex steels (PREN >45).

Applications for standard duplex grades include tanks, piping, process vessels and structural applications.

Weldability of Standard Duplex 2205 Steels ISO/TR 15608 Material Group 10.1

Duplex stainless steels have a very good cracking resistance due the high ferrite content, hot cracking is rarely a consideration when welding these steels. Therefore the problem of most concern in duplex steels are associated with the heat effect zone (HAZ) of welds. The HAZ problems can be loss of corrosion resistance , toughness, or post-weld cracking. To avoid these problems, the welding procedure should focus an minimising total time at temperature in the “red hot” range rather than managing the heat input for any one pass.

Preheating: As general guideline, the max. interpass temperature is limited to 150°C.
PWHT: Is not needed for Duplex stainless steels

Name/Type/GradeNumberStandardsProductAlloyRemarks
X2CrNiN23-4
X2CrNiN23-4
X2CrNiN23-4
X2CrNiN23-4

2304
S32304
S32304
1.4362
1.4362
1.4362
1.4362
S32304
S32304
S32304
S32304
EN 10028-7
EN 10272
EN 10216-5
EN 10217-7
ASTM A-240
ASTM A-928
ASTM A-790
ASTM A-789
Plate
Bar
Seamless tube
Welded tube
Plate
Welded pipe
Smls. & welded pipe
Smls. & welded tube




2304
2304
2304
2304
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
X2CrNiMoSi18-5-3
S31500
S31500
1.4424
S31500
S31500
EN 10216-5
ASTM A-789
ASTM A-790
Seamless tube
Smls. & welded tube
Smls. & welded pipe


EN 13445-2 & EN 13480-2
ASME BPVC
ASME BPVC
X2CrNiMoN22-5-3
X2CrNiMoN22-5-3
X2CrNiMoN22-5-3
X2CrNiMoN22-5-3
X2CrNiMoN22-5-3
X2CrNiMoN22-5-3
F51
F60
S32205


2205
4A
S31803
S31803

S31803
1.4462
1.4462
1.4462
1.4462
1.4462
1.4462
S31803
S32205
S32205
S32205
S32205
S32205
J92205
S31803
S31803
S31803
S31803
EN 10028-7
EN 10272
EN 10216-5
EN 10217-7
EN 10222-5
EN 10253-4
ASTM A-182
ASTM A-182
ASTM A-240
ASTM A-479
ASTM A-815
ASTM A-928
ASTM A-890
ASTM A-240
ASTM A-928
ASTM A-479
ASTM A-789
Plate
Bar
Seamless tube
Welded tube
Forging
Fitting
Forging
Forging
Plate
Bar
Fitting
Welded pipe
Casting
Plate
Welded pipe
Bar
Smls. & welded tube







2205
2205
2205
2205
2205
CD3MN



EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
ASME BPVC
Code Case N-741
Code Case N-741
Code Case N-741
Code Case N-741
Code Case N-741
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
GX2CrNiMoN22-5-3 1.4470EN 10213CastingsEN 13445-2
Table: Typical materials