Chromomolybdenum steel and 321 stainless steel
Thread Content
Which is more heat and wear-resistant, chromium-molybdenum steel valves or 321 valves, and which is suitable for use in catalytic desulfurization lines and slurry systems?
Chromomolybdenum steel is an umbrella term that is not precise; generally speaking, it offers better cost-performance for applications requiring heat and wear resistance.
Chromomolybdenum steel comes in many varieties; I’m not sure which one the original poster is referring to
As for chromium-molybdenum steel used in catalysis and coking, it is not as heat-resistant as 321. The wear resistance of valves depends mainly on the treatment of the sealing surfaces; methods such as surfacing with cemented carbide are used, but the core of the valve itself does not have good corrosion resistance