单孔式回油，模具采用高碳钨合金钢不易破损。

Punch dies made of high carbon tungsten steel and not easy to wear off.

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结果表明，碳对合金钢力学性能的影响显著。

The results show that carbon has a main effect on the mechanical property.

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结果表明，碳对合金钢力学性能的影响显著。

The results show that carbon has a main effect on the mechanical property.

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