303 stainless steel is austenitic free-cutting stainless acid steel, in order to improve the performance of the steel, can be added not more than 0.60 Mo in the steel, can resist ablation, product good cutting and burning resistance. Corrosion resistance. The mechanical properties of 303 stainless steel annealed and de-stressed, the tensile strength is 515 MPA, the yield is 205 MPA, and the elongation is 40% . Standard hardness HRB 90-100, HRC 20-25 for stainless steel 303 Note: HRB100 = HRC20