| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-steep tool steel having softening resistance by optimization of added amount of alloy elements in the steel and having, in particular, high toughness by considering added amount of Mo to added amounts of Cr, V, W, Nb.SOLUTION: There is provided the high-speed tool steel which contains, by mass%, C:0.60 to 0.75%, Si:0.10 to 2.50%, Mn:0.10 to 1.00%, Cr:3.00% to less than 5.00%, Mo:2.00 to 3.60%, W:3.00% or less with 2Mo+W:5.00 to 9.00%, V:0.50 to 2.00%, P:0.050% or less, S:0.030% or less, O:0.0100% or less, N:0.0400% or less and the balance Fe with inevitable impurities and in which ΔC is -0.1000 to 0.0600 and A value is 0.255 to 0.350.SELECTED DRAWING: None |
