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发明公开
CN101629267A 工具钢及其制备方法 有权

工具钢及其制备方法
摘要：
本发明提供一种工具钢，其包含：0.55质量％至0.85质量％的C、0.20质量％至2.50质量％的Si、0.30质量％至1.20质量％的Mn、0.50质量％或更低的Cu、0.01质量％至0.50质量％的Ni、6.00质量％至9.00质量％的Cr、0.1质量％至2.00质量％的Mo+0.5W、以及0.01质量％至0.40质量％的V，其余为Fe和不可避免的杂质，其中当等效圆直径为2μm或更大的粗碳化物在平行于锻造方向的横截面内的面积比率由L(％)表示，并且所述粗碳化物在垂直于锻造方向的横截面内的面积比率由T(％)表示时，面积比率L为0.001％或更高，面积率T为0.001％或更高，并且L/T的比值为0.90至3.00。本发明的工具钢在淬火和回火时表现出各向同性的尺寸变化。
摘要（英）：

The present invention provides a tool steel containing, by mass percent, 0.55 to 0.85% of C, 0.20 to 2.50% of Si, 0.30 to 1.20% of Mn, 0.50% or less of Cu, 0.01 to 0.50% ofNi, 6.00 to 9.00% of Cr, 0.1 to 2.00% of Mo+0.5W, and 0.01 to 0.40% of V, with the balance of Fe and inevitable impurities, in which, when an area rate of a coarse carbide having a circle equivalent diameter of 2 [mu]m or more in a cross section parallel to a forging direction is represented by L(%) and an area rate of the coarse carbide in a cross section perpendicular to the forging direction is represented by T(%), the area rate L is 0.001 % or more, the area rate T is 0.001 % or more, and the ratio L/T is within a range from 0.90 to 3.00. The tool steel of the invention exhibits an isotropic size change in quenching and tempering.

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