Plate stainless steel 17-4™

sheetfor the aerospace industry

ATI 17-4™ precipitation hardening stainless steel (S17400), ATI 17-4 is a chromium-nickel-copper precipitation hardening stainless steel used for applications requiring high strength and a moderate level of corrosion resistance. High strength is maintained to approximately 600°F (316°C). This alloy is designated Grade or Type 630 in several specifications The S17400 alloy is martensitic in structure in the annealed condition and is further strengthened by a low temperature treatment which precipitates a copper containing phase in the alloy. In comparison to many alloys in the precipitation hardening family, the S17400 alloy requires a simple heat treatment; a one step process conducted at a temperature in the range 900°F (482°C) to 1150°F (621°C) depending on the combination of strength and toughness desired. A wide range of properties can be produced by this one step heat treatment. Heat treatment in the 900°F (482°C) range produces highest strength. ATI produces ATI 17-4 in sheet, strip, and plate product forms. ATI 17-4 is produced in compliance with aerospace specifications such as AMS 5604 and standard industrial specifications such as ASTM A693 and ASME SA-693.