ASTM A989/A989M-25

Detail information

Designation: ASTM A989/A989M-25

Publication date: 01/09/2025

Pages: 8

Country: American technical standard

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Anotation

This specification covers hot isostatically-pressed, powder metallurgy, alloy steel piping components such as flanges, fittings, valves, and similar parts for use in pressure systems and high-temperature services. Compacts shall be manufactured by placing a single powder blend into a can, evacuating the can, and sealing it. The entire assembly shall be heated and placed under sufficient pressure for a sufficient period of time to ensure that the final consolidated part meets the density requirements. The powder shall be prealloyed and made by a melting method such as vacuum induction melting followed by gas atomization. Alloy steels shall undergo annealing, liquid quenching, and tempering in accordance to heat treatment temperature and cooling media requirements. The steel both as a blend and as a part shall conform to the chemical composition requirements for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, columbium, tantalum, and titanium. Density measurement, microstructural examination, and hydrostatic, tension, hardness, and fatigue tests shall be performed; wherein, the specimens shall conform to the specified structural integrity and mechanical property requirements such as porosity, microstructure, tensile strength, yield strength, elongation, reduction of area, and Brinell hardness.


Keywords:
alloy steel, chromium-alloy steel, chromium-molybdenum steel, gas-atomized powder, hot isostatically-pressed alloy steel parts, piping applications, pipe fittings, steel, pressure containing parts, steel flanges, steel valves, temperature service applications, elevated, temperature service applications, high,, ICS Number Code 49.025.10 (Steels)