| 1. | Valve steels and alloys for internal combustion engines 内燃机用阀门钢和合金 |
| 2. | Valve steels and alloys for internal combustion engines 内燃机用阀门钢和合金 |
| 3. | Valve steel bars for internal combustion engines - technical requirements 内燃机气阀钢钢棒技术条件 |
| 4. | Valve steel bars for internal combustion engines technical requirements 内燃机气阀钢钢棒技术条件 |
| 5. | Valve steel bars for internal combustion engines - technical requirements 内燃机气阀钢钢棒技术条件 |
| 6. | Valve steels for internal combustion engines 内燃机用阀门钢 |
| 7. | Specification for aircraft material - nickel - chromium - tungsten valve steel 飞机材料规范.镍铬钨阀门钢 |