| 硅铁按硅及其杂质含量，分为十六个牌号，其化学成分如下表：（根据GB2277-87）
牌号 | 化学成分% | | Si | Al | Ca | Mn | CR | P | S | C | | 范围 | 不大于 | | FeSi90Al1.5 | 87.0-95.0 | 1.5 | 0.5 | 0.4 | 0.2 | 0.04 | 0.02 | 0.2 | | FeSi90Al3 | 87.0-95.0 | 3.0 | 0.5 | 0.4 | 0.2 | 0.04 | 0.02 | 0.2 | | FeSi75Al10.5-A | 74.0-80.0 | 0.5 | 1.0 | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 | | FeSi75Al10.5-B | 72.0-80.0 | 0.5 | 1.0 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 | | FeSi75Al1.0-A | 74.0-80.0 | 1.0 | 1.0 | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 | | FeSi75Al1.0-B | 72.0-80.0 | 1.5 | 1.0 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 | | FeSi75Al1.5-A | 74.0-80.0 | 1.5 | 1.0 | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 | | FeSi75 Al1.5-B | 72.0-80.0 | 1.5 | 1.0 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 | | FeSi75 Al12.0-A | 74.0-80.0 | 2.0 | 1.0 | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 | | FeSi75 Al12.0-B | 74.0-80.0 | 2.0 | 1.0 | 0.4 | 0.3 | 0.04 | 0.02 | 0.1 | | FeSi75 Al12.0-C | 72.0-80.0 | 2.0 | - | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 | | FeSi75-A | 74.0-80.0 | - | - | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 | | FeSi75-B | 74.0-80.0 | - | - | 0.4 | 0.3 | 0.04 | 0.02 | 0.1 | | FeSi75-C | 72.0-80.0 | - | - | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 | | FeSi65 | 65.0-<72.0 | - | - | 0.6 | 0.5 | 0.04 | 0.02 | - | | FeSi45 | 40.0-47.0 | - | - | 0.7 | 0.5 | 0.04 | 0.02 | - | |