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| 普通碳素工具钢 (Straight carbon tool steels are still used occasionally in machining, but fast rates of machining cause such a tool to heat so much that it over-tempers itself and softens. 虽然普通碳素工具钢在机加工中仍偶有使用，但车削速度过快会引起这种钢的刀具过热，以致产生过回火而软化。) | |||
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