| 摘要 |
PURPOSE: A method is provided to economically produce a steel having excellent abrasion resistance, super high hardness, smooth surface and inner quality. CONSTITUTION: A molten steel is composed of 0.48 to 0.53wt% of C, 0.15 to 0.30wt% of Si, 0.80 to 1.00wt% of Mn, less than 0.020wt% of P, less than 0.005wt% of S, 0.85 to 1.05wt% of Cr, 0.15 to 0.25wt% of Mo, less than 2ppm of H and the remain of Fe and incidental impurities. The molten steel is continuously cast and secondly cooled by spraying 0.32 to 0.40liter/kg of water to be a casting piece. The casting piece is reheated in a temperature of 1100 to 1280°C in a heating furnace. The casting piece is also depressed in a roughing mill to be a thick steel strip. The steel strip is in a temperature of 550 to 600°C for 48 to 72hours and cooled with air. Then, the strip is heated in a temperature of 820 to 850°C and tempered in a temperature of 140 to 180°C to be a super high hardness steel.
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