Steel, Corrosion Resistant, Bars, Wire, and Forgings, 13Cr (0.30 - 0.40C) (SAE 51420), Annealed AMS5621E

These products have been used typically for parts requiring corrosion resistance and oxidation resistance up to 800 degrees F (427 degrees C) and hardness at room temperature within the range 40 50 HRC when heat treated, but usage is not limited to such applications.