EN ISO 15608 Material Group 5.3: Cr-Mo steels (free of vanadium) with
C ≤ 0,35 %, 3,5 % ≤ Cr < 7,0 % and 0,4 < Mo ≤ 0,7 %;
Features of material CrMo such as material no. 1.7362
This Material group are creep and heat resistant special structural (5Cr–0.5Mo) steels with ferrite–martensite microstructure. Creep resistance steels (well-known as CrMo steels), contain strong carbide and/or nitride forming elements. These are intended to provide a fine dispersion of precipitates that both increase the tensile strength and prevents the formation of the voids. Also, this increase the hardenability (the ability to form martensite).
It is mainly used in boiler and apparatus construction for boiler drums and pressure vessels. The materials are suitable for temperatures up to 550°C (590°C).
Applications for creep and heat resistant steels (5Cr–0.5Mo)
Industries that operate equipment under high temperatures can benefit from using chromium molybdenum alloys for boiler, apparatus construction and pressure vessels. for high temperature service These include power stations, energy, oil and gas, chemical, and metal production industries. These materials are often used as the base metal for clad components.
Weldability of Cr-Mo steels ISO 15608 Material Group 5.3
The chromium-molybdenum alloyed heat-resistant steels are generally welded with a preheating suitable for the steel grade and wall thickness in question e.g. min. 200 °C and max. interpass 350 °C. After welding, these steels generally have to be PWHT e.g. 730 – 760°C.
Typical materials in group 5.3
| Name/Grade | Number | Standard | Product | Remarks |
|---|---|---|---|---|
| GX15CrMo5 | 1.7365 | EN 10213 | Casting | EN 13445-2 & EN 13480-2 |
| X16CrMo5-1 | 1.7366 | EN 10222-2 | Forging | EN 13445-2 & EN 13480-2 |
| X12CrMo5 X11CrMo5 X11CrMo5 X11CrMo5 F5 T5 T5 WP5, Cl. 1 WP5, Cl. 3 P5 F5 FP5 5, Cl. 1 5, Cl. 2 5CR, Cl. 1 5CR, Cl. 2 – T5c P5c | 1.7362 1.7362+I 1.7362+N1&N2 1.7362 K41545 K41545 K41545 K41545 K41545 K41545 K41545 K41545 K41545 K41545 K41545 K41545 – K41245 K41245 | EN 10028-2 EN 10216-2 EN 10216-2 EN 10253-2 ASTM A-182 ASTM A-199 ASTM A-213 ASTM A-234 ASTM A-234 ASTM A-335 ASTM S-336 ASTM A-369 ASTM A-387 ASTM A-387 ASTM A-691 ASTM A-691 – ASTM A-213 ASTM A-335 | Plate Seamless tube Seamless tube Fitting Forging Smls. tube Smls. tube Fitting Fitting Smls. pipe Forging Forging pipe Plate Plate Fusion welded pipe Fusion welded pipe – Smls. tube Smls. pipe | 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 ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| C5 CP5 | J42045 J42045 | ASTM A-217 ASTM A-426 | Casting Centrifugal cast pipe | ASME BPVC ASME BPVC |
| F5a F5A | K42544 K42544 | ASTM A-182 ASTM A-336 | Forging Forging | ASME BPVC ASME BPVC |
| T5b P5b | K51545 K51545 | ASTM A-213 ASTM A-335 | Smls. tube Smls. pipe | ASME BPVC ASME BPVC |