CrMoV base materials provide good creep rupture
properties up to about 580°C, with a reasonable degree
of corrosion resistance in superheated steam.
Typical applications for the cast materials include
**valve casings and steam turbines, general use for
boilers, pressure vessels in the power generation and
petrochemical industries** . Vanadium increases the tempering stability of quenched steel and produces a secondary hardening effect. It also refines the grains, increases the strength and yield ratio and low-temperature toughness after normalizing, and improve the welding performance of ordinary low-alloy steel. It is vey important to observe specifications for preheating and post-weld heat treatment according to the base materials.
1¼%Cr-½%Mo alloyed steel consumables for
elevated temperature service with addition of vanadium.
After PWHT, the microstructure consists of
Materials to be welded
EN W.Nr.: G17CrMoV5-10 (1.7706), 21 CrMoV 5 11 (1.8070),
15 CrMoV 5 10 (1.7745),
GS-17CrMo 5 11 (1.7706) (cast). ASTM: A389 gr. C24 (cast),
A356 gr. 9 (cast).