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In diffusion layer , cracks were found after hardening and tempering.
调质使得扩散层产生裂纹.
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The line has perfect performances and is widely used for hardening and tempering bearing parts.
该生产线消化吸收国外先进技术,性能优越,主要用于轴承零件的淬、回火.
This paper analyzes the problems existing hardening and tempering process of the large draw bar.
该文分析了大型拉杆调质工艺存在的问题.
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