CrMoV steel is a heat resistant steel typically used in applications such as shafts and fasteners used in high temperature service.

The chromium is used in this steel to increase resistance to corrosion and oxidation, to impart high temperature strength and to increase the hardenability.  The molybdenum addition also imparts higher hardenability and increases high temperature tensile and creep strengths.  The vanadium addition inhibits grain growth during heat treating while improving strength and toughness.  This steel is referenced in the industry specification AMS 6304.

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Chemical Composition Ranges
and Limits Charts.