单词：direct hardening
direct hardening的用法和样例：
例句
- The maximum degree of hardness obtainable in steel by direct hardening is determined largely by the carbon content.直接淬火后的刚所能获得的最大硬度在很大程度上时由含碳量决定的。
- This article recommends the process of direct quenching after carburizing for sucker rod pump liners.介绍了抽油泵衬套渗碳后直接淬火处理工艺。
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