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| English | Chinese |
| old acid storage tank | 旧酸储存池 |
| old grade | 连前一炉异钢种钢水 (【参】在连铸专业中有时作"前一炉(异钢种)钢水"解，) |
| old grade | 老钢种 |
| old grade of steel being cast | 前一炉正在浇注的异钢种钢水 (In the grade change operation, the tundish containing the old grade of steel being cast is first emptied to a certain depth before pouring the new grade from the ladle. 变钢种操作时，在由钢包浇人下一炉异钢种钢水前，首先将盛有上一炉正在浇注钢种钢水的中间包排空到一定深度。) |
| old high bloomery | 老式熟铁冶炼用竖炉 |
| old-horse | 炉缸积【死】铁 |
| old-horse | 残铁 (高炉的) |
| old-horse | 死铁层 |
| old-horse | 炉底积【死】铁 |
| old-horse | 炉底死铁 |
| old-horse | 炉缸积铁 |
| old iron | 废铁 |
| old-metal | 废金属 |
| old sand | 黑砂 |
| old sand | 旧砂 |
| old-style door | 旧式炉门 |
| old-style door for coke oven | 旧式焦炉门 |
| old-style mill | 老式轧机 |