SAE AMS 5931B
Steel, Wear, Galling, and Corrosion-Resistant Bars, Wire, Forgings, Extrusions, Mechanical Tubing, Rings, and Stock for Forgings, Rings, and Extruding 5.0Mn - 3.5Si - 16.5Cr - 5.0Ni - 0.14N Solution Heat Treated