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| cored steel; hollow steel; drill steel (【技】一种断面多为圆形、正六角形，中心有通流体孔道的型钢。所使用的钢种主要是碳素中空钢及合金中空钢两大类，主要用来制造凿岩用的钎杆。); hollow-drill shank steel; hollow-drill steel | |||
| hollow drill steel | |||
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| hollow drill steel | |||
| 中 空钢: 11 phrases in 4 subjects |
| Automobiles | 1 |
| Metallurgy | 7 |
| Rail transport | 1 |
| Technology | 2 |
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