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| Grade | Chemical composition（%）≤ | ||||||||
| GB | ASTM | JIS | Cu | Ni+Co | Fe | Mn | Pb | P | S |
| B5 | – | – | Balance | 4.5-5.5 | 0.02 | – | ≤0.7 | 0.01 | 0.01 |
| C | Mg | Si | Zn | Sn | Others | ||||
| 0.03 | – | – | – | – | 0.5 | ||||
| Grade | Chemical composition（%）≤ | ||||||||
| GB | ASTM | JIS | Cu | Ni+Co | Fe | Mn | Pb | P | S |
| B5 | – | – | Balance | 4.5-5.5 | 0.02 | – | ≤0.7 | 0.01 | 0.01 |
| C | Mg | Si | Zn | Sn | Others | ||||
| 0.03 | – | – | – | – | 0.5 | ||||
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