| 摘要 |
PROBLEM TO BE SOLVED: To produce tool steel excellent in weldability and machinability without deteriorating its mechanical property such as toughness and wear resistance and to provide a die excellent in various characteristics to be required. SOLUTION: This die is produced by refining tool steel having a compsn. contg., by weight, 0.45 to <0.65% C, 0.1 to 2.1% Si, 0.1 to 1.2% Mn, 4.5 to 12.0% Cr, one or two kinds of Mo and W so as to satisfy (Mo+1): 1.5 to 3.5%, 0.05 to <0.5% V, and the balance Fe with inevitable impurities, in which eutectic value Z=[=8×(C%)+0.6×(Cr%)] is controlled to <=10.8 to the hardness of >=55 HRC and executing machining. Preferably, in the tool steel, the content of Cr is controlled to 4.5 to 9.0%, the contents of one or two kinds of Mo and W are controlled to (Mo+1/2W):1.5 to 2.5%, and 0.005 to 0.1% S, <=5.0% Ni and <=100 ppm Ca are controlled. Additionally, it is applied to quenching at 1000 to 1050 deg.C and tempering at >=500 deg.C to control its hardness to >=55 HRC.
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