Historical
SAE AMS 5643U-2016 (SAE AMS5643U-2016)
Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr - 4.0Ni - 0.30Cb Nb) - 4.0Cu Solution Heat Treated, Precipitation Hardenable
Society of Automotive Engineers [sae]