... b, Hardness:HB 160~220 Anealing c, Thickness and available for plates:10,12,14,16,18,20,23,25,28 ... ,330,340(mm), cutted any sizeopun custom's requirements. d, For round, diameter available:20~1200mm e, Chemical composition(%): C: 0 ... .5~0.8 Ni:0.40(max) f, Usage: Used for making mould buttomds,plartic mould, normal machinery parts and so on.