| 摘要 |
PROBLEM TO BE SOLVED: To provide steel excellent in fatigue characteristics and moreover excellent in machinability without the remarkable increase of the cost and without deteriorating the toughness of a die by well balancing SKD 11 series steel with S without requiring the addition of expensive REM and the remarkable change of the components of steel kinds. SOLUTION: This steel is the one having a compsn. contg., as essential components, by weight, 0.65 to 1.50% C, <=2.0% Si, 5.0 to 13.0% Cr, 0.030 to 0.20% S and <=1.50% Mn, contg., as selective components, one or two kinds of Mo and W of 1.0 to 5.0% by Mo equivalent (Mo+1/2W) and one or two kinds of V on Nb of 0.05 to 1.0% by V equivalent (V+1/2Nb), and the balance Fe with inevitable impurities. Or, the steel is furthermore mixed with 0.20 to 3.0% Co.
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