| FERRO CHROMIUM | | IS 1170 : 1992 |
| Grade No. | Grade Designation | Constituents, | Percent | | Remarks |
| | | Cr. | C | Si. Max | |
| (1) | (2) | (3) | (4) | (5) | (6) |
| a) | High Carbon Ferrochromium | | | | |
| 1 | 7 Fe Cr 65 | 60 to 70 | 6 to 8 | 1.5* | Ferrochromium with Si contents 1.5 to 4% and |
| | | | | | 4 to 6% can also be supplied in Grade 1 and 2. |
| 2 | 5 Fe Cr 58 | 60 to 70 | 4 to 6 | 1.5* | |
| 3 | 7 Fe Cr 58 | 55 to 60 | 6 to 8 | 4 | |
| 4 | 5 Fe Cr 58 | 55 to 60 | 4 to 6 | 6 | |
| | | | | | |
| b) | Medium-Carbon Ferrochromium | | | | |
| 5 | 15 Fe Cr 55 | 60 Max | 1 to 2 | 2 | |
| | 3 Fe Cr 55 | 60 Max | Over 2 & upto | 2 | |
| | | | Incl. 4.0 | | |
| 6 | 15 Fe Cr 64 | Over 60 upto | 1 to 2 | 2 | |
| | | & incl. 67 | | | |
| | 3 Fe Cr 64 | Over 60 upto | Over 2 & upto | 2 | |
| | | & incl. 67 | Incl. 4 | | |
| 7 | 15 Fe Cr 71 | Over 67 upto | 1 to 2 | 2.0 | |
| | | & incl. 75 | | | |
| | 3 Fe Cr 71 | Over 67 upto | Over 2 & upto | 2.0 | |
| | | & incl. 75 | Incl. 4 | | |
| | | | | | |
| c) | Low-Carbon Ferrochromium | | | | |
| 8 | 002 Fe Cr 55 | 60 Max | 0.030 Max | 1.5 | |
| | 004 Fe Cr 55 | 60 Max | Over 0.030 upto | | |
| | | | And incl. 0.050 | 1.5 | |
| | 008 Fe Cr 55 | 60 Max | Over 0.05 upto | | |
| | | | & incl. 0.10 | 1.5 | |
| | 03 Fe Cr 55 | 60 Max | Over 0.10 upto | | |
| | | | & incl. 0.5 | | |
| | 08 Fe Cr 55 | 60 Max | 0.75 Max | 1.5 | |
| 9 | 002 Fe Cr 64 | Over 60 upto | 0.030 Max | 1.5 | |
| | | & incl. 67 | | | |
| | 004 Fe Cr 64 | Over 60 upto | Over 0.030 upto | 1.5 | |
| | | & incl. 67 | & incl. 0.050 | | |
| | 008 Fe Cr 64 | Over 60 upto | Over 0.05 upto | 1.5 | |
| | | & incl. 67 | & incl. 0.10 | | |
| | 03 Fe Cr 64 | Over 60 upto | Over 0.10 upto | 1.5 | |
| | | & incl. 67 | & incl. 0.5 | | |
| | 08 Fe Cr 64 | Over 60 upto | 0.75 Max | 1.5 | |
| | | & incl. 67 | | | |
| 10 | 002 Fe Cr 71 | Over 67 upto | 0.030 Max | 1.5 | |
| | | & incl. 75 | | | |
| | 004 Fe Cr 71 | Over 67 upto | Over 0.030 upto | 1.5 | |
| | | & incl. 75 | & incl. 0.050 | | |
| | 008 Fe Cr 71 | Over 67 upto | Over 0.05 upto | 1.5 | |
| | | & incl. 75 | & incl. 0.10 | | |
| | 03 Fe Cr 71 | Over 60 upto | Over 0.030 upto | 1.5 | |
| | | & incl. 75 | & incl. 0.5 | | |
| | 08 Fe Cr 71 | Over 67 upto | 0.75 Max | 1.5 | |
| | | & incl. 75 | | | |
| 11 | 008 Fe Cr 64 Si 4 | 60 to 70 | 0.05 to 0.10 | 4 | |
| 12 | 008 Fe Cr 71 Si 4 | Over 67 upto | 0.05 to 0.10 | 4 | |
| | | & incl. 75 | | | |
| | | | | | |
| d) | High-Nitrogen Low-Carbon Ferrochromium | | | | |
| 13 | Fe Cr 64 N 075 | 60 to 67 | 0.10 Max | 1.0 | Nitrogen shall be 0.5 to 1.0 |
| 14 | Fe Cr 64 N 125 | 60 to 67 | 0.10 Max | 1.0 | Nitrogen shall be 1.0 to 1.5 |
| 15 | Fe Cr 64 N 175 | 60 to 67 | 0.10 Max | 1.0 | Nitrogen shall be 1.5 to 2.0 |
| 16 | Fe Cr 64 N 300 | 60 to 67 | 0.10 Max | 1.0 | Nitrogen shall be 2.0 to 4.0 |
| | | | | | |
| e) | Carbon-Free Ferrochromium | | | | |
| 17 | Fe Cr 70 | 65 to 75 | Taces | 2.0 | Aluminium content shall be 1.0% Max |
| | | | | | |
Note Unless otherwise specified by the purchaser the sulpher and phosphorus content in each grade shall be not more than 0.05 percent. | | | | | |