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ISO/TR 15608 ISO/TR 15608 Material Group 6.3

ISO/TR 15608 Material Group 6.3: Steels with 3,5 % ≤ Cr < 7,0 %, Mo ≤ 0,7 % and 0,45 < V ≤ 0,55 %;

Features of low alloyed Cr-Mo-V steel (2.25Cr–1Mo–V)

Hydrosteel CrMo (V) steels with 0.5 % V offer better performance for petrochemical reactors compared to 10CrMo9-10 steels that means the specified yield strength and creep properties for this material is a lot of better compared to 10CrMo9-10 steel.
Depending on the heat treatment, the yield strength of 20CrMoV13-5-5 steel is in the range of Rp0,2 = 520 – 640 MPa.

Applications for low alloyed Cr-Mo-V (20CrMoV13-5-5) steel

This material may be used in all applications requiring service conditions under high temperature and high pressure of hydrogen. Steel for hydrogen service an elevated temperature and pressure is stell that not readily susceptible to decarbusation by hydrogen at elevated pressures and temperatures and thus to hydrogen and grain boundary embitterment. This characteristic is achieved ba adding alloying elements that from carbides at the operating temperature.

Is particularly suitable for pressure equipment in high temperature hydrogen service (e.g. hydrotreating reactors, exchangers, hydrotreating reactors, hydrodesulfurizers, hydrocrackers)

Welding conditions for 20CrMoV13-5-5 steel

Welding needs precautions, in particular: tight control of preheat, interpass temperature intermediate stress relieving and post weld heating to avoid cold cracking;

Weld metal and HAZ in the as welded condition are susceptible to hydrogen induced cold cracking.

However, the risk of cold cracking is known to occur in the weld metal more frequently than in the HAZ. Therefore, a preheat and minimum interpass temperature of 200°C is recommended for thickness higher than 30 mm. After welding a Dehydrogenation Heat Treatment ≥ 300 °C is recommended. After welding, these steels generally have to be PWHT e.g. 700 -730 °C.

NameNumberStandardProductRemark
20CrMoV13-5-5
D, Cl. 4a
1.7779
K31835
EN 10216-2
ASTM A-542
Smls. tube
Forging
EN 13445-2 & EN 13480-2
ASME BPVC
Table: Typical materials