| 牌号 | A290 Grade 4 Class L |
|---|---|
| 对应标准 | ASTM A290/A290M-2016(R2021)
减速齿轮齿圈用碳素钢和合金钢锻件标准规范 Standard Specification for Carbon and Alloy Steel Forgings for Rings for Reduction Gears |
| 归类 | 合金钢 |
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