Valve material
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Can 20G material and 15CrMo be welded together?
One is made of ordinary carbon steel, and the other is made of superalloy steel; in principle, boilers and pressure vessels made of different materials cannot be welded together.
Cracking is likely to occur when welding carbon steel with chromium-molybdenum steel; it’s best to use different materials for the flange surfaces. If that’s not possible, conducting a proper weld assessment should help as well. Controlling the welding process properly should also work. Based on the material, it seems it will be used in areas exposed to steam; locations that are not subject to corrosion should perform better
It cannot be welded – this is carbon steel and high-alloy steel; they cannot be welded to each other
If it is not used in locations such as pressure vessels or areas with high pressure, it can be welded