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| 表面硬化钢; 渗碳钢 | |||
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| 渗碳钢 | |||
| 表面渗碳或淬火硬化钢 | |||
| 表面渗碳钢; 表面硬化钢; 表面硬化钢 (Armor plate and parts of rifles, typewriters and automobile engines are a few of the multitude of case-hardened steel components. 装甲钢板，步枪、打字机和汽车发动机的零部件是诸多表面硬化钢零部件中的几例。) | |||
| 表面渗碳硬化钢 | |||
| case -hardened steel: 2 phrases in 2 subjects |
| Aviation | 1 |
| Technology | 1 |