Stainless Steel Grade: 200 series stainless steel: 201,202 (chromium, nickel, manganese - austenitic stainless steel) 300 stainless steel series: 301,302,302HQ, 303,304,304L, 304F, 304HC, 316,316L, 316F, 316S, 316Ti, 310,310S, 314,314L, 317,317L, 321 (chromium, nickel - austenitic stainless steel) 400 stainless steel series: 410,420,420J2,430,430F, 431 (ferritic and martensitic stainless steel) Note: L on behalf of low-carbon, low carbon content such as 304L than 304. H and S stands for high temperature, such as better than 310 temperature resistance 310S, 304H than 304 heat. Stainless steel wire can be called stainless steel wire, rod, plate element, but with different stainless steel wire rope. Main spring wire, screws, wire, bright line, annealing line, electrolysis line, car axis, hairpin lines. The hardness of the spring line has the following: all soft | 1/4 hard | Semi-hard | 3/4 hard | full hard | extra-hard. Specifications: Ф0.08mm ~ Ф12.6mm.