Stainless Steels: Cast

Stainless steel castings are of two broad groups: corrosion resistant and heat resistant castings. Corrosion resistant grades are suitable for use in aqueous and vapor service environments below 650 °C while the heat resistant variety is suitable for temperature above 650 °C, although this temperature distinctions overlap in some cases. The primary concern for the use of the corrosion resistant grade is the ability to resist corrosion while mechanical properties are of secondary importance; whereas for the heat resistant grade, the creep and rupture resistances are primary concerns. But the main distinction in these grades is based on the carbon content which for the corrosion resistant grade is usually below 0.20 wt% and quite higher in the heat resistant grade. Classification and designation in these grades are based on the systems developed by the High Alloy Product Group of the Steel Founders’ Society of America which reflects whether a specific grade is for corrosion control or high temperature service, and the presence of other microalloying elements.