1065 spring steel strip thickness: 0.05~45mm width:30~200mm surface:2B ... wheels, cover platerstensil strength:1100 to 2000 N/mm2Tempered spring steel stripMaterial grade: c50,c55,c60,c67,c70,c75 Thickness: 0 ... ,bright,white,polished,nature,grey,black Hardness: 40-55HRC for hardened and tempered treatment. Edge: slit, round, square edge Tensil stength ...