Tool Die Steel rounds and flats D3, D2, H11, H13, P20, H21, O1, A2, O2, L6,1.2080, 1.2379, 1.2344, 1.2311, SKD61, NAK80, DC53, Cr12, Cr12MoV, 6CrW2Si etc.2. Alloy Steel Round BarsJIS SCr420, SCr440, SCM435, SCM440 etc.ASTM 5120, 5140, 4135, 4140, 4142, 5115, 8620 etc.En 17Cr3, 41Cr4, 34CrMo4, 42CrMo4, 16MnCr5 etc. 3. Bearing Steel Round Bars and flat bars Steel grade: 52100, 100Cr6, GCr15 4. Spring steel65Mn?50CrVA?51CrV4?50CrVA?55Cr3?55CrMnA?55Si2Mn?60Si2CrA?60Si2CrVA?60Si2Mn?A??60CrMnA?SAE5160?SAE6150?SAE9254?SUP11A?SUP9?A??SUP6?SUP7?60Si7?55Cr3?50CrV4 etc. high speed steel? was derived from the fact that it is capable of cutting metal at a much higher rate than carbon tool steel and continues to cut and retain its hardness even when the point of the tool is heated to a low red temperature. Tungsten is the major alloying element but it is also combined with molybdenum, vanadium and cobalt in varying amounts.
