... 20 mm 470 mm Flat bars thickness 20 mm Tool steel , mould steel , die steel , DIN 1.2343 / ASTM H-11Size range , Round bars 20 ... tool steel : H13/1.2344 , H11/1.2343 , 1.2714 , 1.2767 etc.Cold working tool steel :D2/1.2379 , D3/1.2080, D6/1.2436 , O1/1.2510 ,1.2316 etc.High speed steel : M2/1 ...