Month: January 2019

What is AMS 4640H?

  AMS 4640H is the current revision of AMS 4640.  This specification covers C63000 Nickel Aluminum Bronze alloy in bars, rods, shapes, tubes and forgings. Under this specification the Nickel Aluminum Bronze can be drawn and stress relieved (HR50) or temper annealed (TQ50). The AMS 4640 specification began in 1940 and was simply AMS 4640.