This specification covers steel castings, martensitic stainless steel and alloys steel castings for valves, flanges, fittings, and other pressure-containing parts intended primarily for high-temperature and corrosive service. The grades of steels covered here are: Grade WC1, Grade WC4, Grade WC5, Grade WC6, Grade WC9, Grade WC11, Grade C5, Grade C12, Grade C12A, and Grade CA15. Heat treatment shall consist of normalizing and tempering for Grade C12A and tempering for all other grades. Heat treatments shall be performed after castings have been allowed to cool. Heat and product analyses shall be performed wherein specimens shall conform to required chemical composition of carbon, molybdenum, chromium, nickel, vanadium, manganese, phosphorus, sulfur, silicon, columbium, nitrogen, aluminum, copper, titanium, tungsten, and zirconium. The surface of the casting shall be examined visually and shall be free of adhering sand, scale, cracks and hot tears. Steels shall undergo tension test, and shall conform to the following mechanical requirements: tensile strength, yield strength, elongation, and reduction of area.
1.1 This specification covers martensitic stainlesssteel and alloy steel castings for valves, flanges, fittings, andother pressure-containing parts (Note 1) intended primarily forhigh-temperature and corrosive service (Note 2).
1.2 One grade of martensitic stainless steel andnine grades of ferritic alloy steel are covered. Selection willdepend on design and service conditions, mechanical properties, andthe high-temperature and corrosion-resistant characteristics (Note3).
Note1—Carbon steel castings for pressure-containing parts are coveredby Specification A216/A216M. Low alloy quench-and-tempered grades equivalent toSpecification A217/A217M grades may be found in both SpecificationsA352/A352M and A487/A487M.
Note2—The grades covered by this specification represent materials thatare generally suitable for assembly with other castings or wroughtsteel parts by fusion welding. It is not intended to imply thatthese grades possess equal degrees of weldability; therefore, it isthe responsibility of the purchaser to establish for himself asuitable welding technique. Since these grades possess varyingdegrees of suitability for high-temperature and corrosion-resistantservice, it is also the responsibility of the purchaser todetermine which grade shall be furnished, due consideration beinggiven to the requirements of the applicable construction codes.
Note3—The committee formulating this specification has included ninegrades of materials that are considered to represent basic types offerritic alloy steels suitable for valves, flanges, fittings, andother pressure-containing parts. Additional alloy steels that maybetter fulfill certain types of service will be considered forinclusion in this specification by the committee as the needbecomes apparent.
1.3 The values stated in either SI units orinch-pound units are to be regarded separately as standard. Thevalues stated in each system may not be exact equivalents;therefore, each system shall be used independently of the other.Combining values from the two systems may result in non-conformancewith the standard.