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Stainless Steel 17-7PH AMS 5644
AMS 5644 is a sub-type specification of Stainless Steel 17-7PH which is a semi-austenitic precipitation hardening steel with high levels of Chromium and Nickel. This steel is mainly used in aerospace applications for manufacturing of flat springs, conical springs, washers, eyelets, and strain gauges. It also finds use in chemical processing equipment, heat exchangers, power boilers, superheater tubes and components that require high strength at high temperatures.
Main qualities of parts made of this stainless steel are high strength and hardness up to 600° F (315° C), excellent fatigue properties, minimal distortion upon heat treatment, good formability in the annealed condition, and good corrosion resistance.
AMS 5644 is available in the form of bars and forgings. Compared to other sub-type specifications of 17-7PH stainless steel, AMS 5644 is the best choice if welding is required during fabrication.
Parts made of this specification can be welded using conventional fusion and resistance techniques, followed by austenite conditioning and precipitation hardening for high-strength bond.
Overall, due to the high concentration of Aluminum and its ability to deteriorate the penetration of the weld, the bond will not be as strong as other steels in this category, namely specifications of Stainless Steel 17-4PH.