... 1921C/c mould steel HMD1Specialized tool steel(7CrSiMnV, CH, CH-1, Cr12MoV, 9Mn2V, CrWMn, GC15, T10A, CrSiMnMoV, HMD5,HMD1, G05, FH5 ... bars Dia: 80~450mm Length:2000-13000mm or as required 1) Chemical Composition(GB) %CSiMnCrMoV 0.701.00.851.0 0 ... forged, black or machined surface, Annealed, hardness: HRC=62-64. HBS:229-2353) Application: various large-sized mirror plastic mould, precision ...