a high - strength , high corrosion - resistant and non - magnetic stainless steel which is further excellent in strength and corrosion resistance and safe in the living body and also can stand against various corrosive environments . the stainless steel comprises 0 . 15 % by weight or less of c , 1 . 0 % or less of si , 3 . 0 to 12 . 0 % of mn , 0 . 030 % or less of p , 0 . 50 % or less of ni , 15 . 0 to 21 . 0 % of cr , 0 . 70 to 1 . 50 % of n , 0 . 020 % or less of al and 0 . 020 % or less of o , and a remainder of fe and inevitable impurities .