ASTM A351 / A351M

This specification covers austenitic steel castings for valves, flanges, fittings, and other pressure-containing parts.A number of grades of austenitic steel castings are included in this specification. Since these grades possess varying degrees of suitability for service at high temperatures or in corrosive environments, it is the responsibility of the purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical properties, and high-temperature or corrosion-resistant characteristics, or both.

Chemical Properties

Grade	Carbon	Manganese	Sulfur	Silicon	Phosphorus	Chromium	Nickel	Molybdenum	Columbium	Vanadium	Nitrogen	Copper

Note A: Grade CF8C shall have a columbium content of not less than 8 times the carbon content but not over 1.00 %. Note B: Grade CF10MC shall have a columbium content of not less than 10 times the carbon content but not over 1.20 %. Note C: Grade HG10MNN shall have a columbium content of not less than 8 times the carbon, but not over 1.00 %.

Mechanical Properties

Grade	Tensile strength, ksi [MPa]	Yield strength,A min, ksi [MPa]	Elongation in 2 in. [50 mm], min, %B

Note A: Determine by the 0.2 % offset method. Note B: When ICI test bars are used in tensile testing as provided for in Specification A985/A985M, the gage length to reduced section diameter ratio shall be 4 to 1.