组成 | 镍 | 钴 | 铜 | 铁 | 锌 | 铅 | 钙 | 镁 | 钠 | 镉 | 锰 | 铬 | 汞 | 水不溶物 | |
Ni | Co | Cu | Fe | Ze | Pb | Ca | Mg | Na | Cd | Mn | Cr | Hg | |||
含量 | Ⅰ类优等品 | ≥22.2 | ≤0.050 | ≤0.0010 | ≤0.0010 | ≤0.0010 | ≤0.0010 | ≤0.010 | ≤0.010 | ≤0.020 | ≤0.0003 | ≤0.0030 | ≤0.0010 | ≤0.0010 | ≤0.010 |
Ⅱ类优等品 | ≥21.8 | ≤0.40 | ≤0.0015 | ≤0.0015 | ≤0.0010 | ≤0.0010 | ≤0.010 | ≤0.010 | ≤0.020 | ≤0.0003 | ≤0.0030 | ≤0.010 |