| 摘要 |
PROBLEM TO BE SOLVED: To provide a tool steel cast steel article usable for a cold tool, a raw material for press die, a raw material for hot press die, a die raw material for casting of the like capable of short-period delivery without conducting solid solution treatment at high temperature for long term, and a manufacturing method therefor.SOLUTION: A tool steel cast steel article contains, by wt.%, C:0.5 to 1.0%, Si:0.2 to 1.2%, Mn:0.25 to 1.50%, Cr:4.0 to 8.0%, Mo:0.8 to 2.0%, V:0.2 to 1.0% and the balance Fe with inevitable impurities. By conducting a heat treatment by heating and holding at 840 to 880°C for 1 to 3 hours and cooling to any cooling temperature of 500°C to 720°C at -15 to -40°C/h, a matrix structure is granular pearlite, free carbide is 0.1% to 5% by area percentage and hardness after the heat treatment is HB180 to HB250.SELECTED DRAWING: Figure 6 |
