ASTM A988/A988M-26

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Metal fittings

Annotation of standard text ASTM A988/A988M-26 :

This specification covers hot isostatically-pressed, powder metallurgy, stainless steel piping components such as flanges, fittings, valves, and similar parts, for use in pressure systems and temperature service applications. The specification includes several grades of martensitic, austenitic, age hardening, and austenitic-ferritic stainless steels. Compacts shall be manufactured by placing a single powder blend into a can, evacuating the can, and sealing it. The powder shall be prealloyed and made by a melting method (such as but not limited to air or vacuum induction melting, followed by gas atomization) to produce the specified chemical composition for carbon, manganese, phosphorus, sulfur, nickel, chromium, molybdenum, columbium, tantalum, copper, tungsten, and nitrogen. Other manufacturing requirements including compact homogeneity, microstructure, and can material removal are given. Heat treatment requirements, such as austenitizing or solutioning, cooling, quenching, tempering, and ageing, and structural integrity requirements, such as density, hydrostatic tests, and ultrasonic tests are detailed as well. Mechanical properties include tensile strength, yield strength, elongation, and hardness. Product analysis shall conform to the chemical requirements.

Keywords:

age-hardening stainless steel, austenitic stainless steels, austenitic-ferritic stainless steel, gas-atomized powder, hot isostatically-pressed stainless steel parts, martensitic stainless steel, pipe fittings, steel, piping applications, pressure containing parts, stainless steel fittings, stainless steel flanges, steel valves, temperature service applications, elevated, temperature service applications, high,, ICS Number Code 23.040.40 (Metal fittings)