Feircróimiamis cóimhiotal iarainn é a bhfuil cróimiam agus iarann mar phríomhchodanna aige. Tá sé ar cheann de na príomhghníomhairí cóimhiotail sa tionscal cruach. Tá idir 50% agus 70% cróimiam i bhfearrochrome.
ZhenAn ferrochrome% 3a
| Grád | Comhdhéanamh Ceimiceach(%) | |||||
| Cr | C | Si | P | S | ||
Micreacharbóin |
FeCr{0}} | 58-68 | 0.03-0.15 | 1.0-2.0 | 0.03-0.06 | 0.025-0.03 |
| FeCr{0}} | 63-68 | 0.03-0.15 | 1.0-2.0 | 0.03-0.06 | 0.025-0.03 | |
Ísealcharbóin |
FeCr{0}} | 58-68 | 0.25-0.5 | 1.5-3.0 | 0.03-0.06 | 0.025-0.03 |
| FeCr{0}} | 63-68 | 0.25-0.5 | 1.5-3.0 | 0.03-0.06 | 0.025-0.03 | |
Meáncharbóin |
FeCr{0}} | 58-68 | 1.0-4.0 | 1.5-3.0 | 0.03-0.06 | 0.025-0.03 |
| FeCr{0}} | 63-68 | 1.0-4.0 | 1.5-3.0 | 0.03-0.06 | 0.025-0.03 | |
Ard-charbóin |
FeCr{0}} | 58-68 | 4.0-10.0 | 3.0-5.0 | 0.03-0.06 | 0.03-0.06 |
| FeCr{0}} | 63-68 | 4.0-10.0 | 3.0-5.0 | 0.03-0.06 | 0.03-0.06 | |
