| 摘要 |
PURPOSE: A method of manufacturing high carbon tool steel strip for thick plate with high hardenability and impact resistance is provided. CONSTITUTION: The method includes the steps of reheating a steel sheet comprising C 0.7 to 0.9 wt.%, Si 0.2 to 0.5 wt.%, Mn 0.4 to 0.7 wt.%, 0.005 wt.% or less of S, 0.02 wt.% or less of P, Ni 0.5 to 2.0 wt.%, Cr 0.1 to 0.5 wt.%, Al 0.02 to 0.05 wt.%, N 0.005 to 0.015 wt.%, Ca 0.001 to 0.01 wt.%, a balance of Fe and incidental impurities at less than 1250°C for less than 250 minutes, followed by hot rolling; coiling the hot rolled steel sheet at 580 to 670°C; pickling the hot coil; spheroidizing the pickled hot coil in the temperature range of 650°C to A1 transformation point, followed by quenching and tempering.
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