The below describe grades are classified grey cast iron, ductile iron as well as cast iron. The ductile iron differ in graphite i.e ductile iron have nodule rather than flake . Nodule property is achieved by adding magnesium. Ductile iron are having excellent strength and ductility. The cast iron grades have flake graphite which results in a brittle alloy but can offer good dampening and hardness properties.
Grades and Chemical Composition of Cast iron |
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| SR NO | CAST | Other Common designation | UNS | ASTM | C | Mn | Cr | Ni | Mo | Fe | Cu | P | Si | S | N | Others |
| 1 | FG/Ht 350 | |||||||||||||||
| 2 | FG/HT300 | 2.9`3.2 | 0.9~1.1 | 0.15 max | 1.2~1.5 | 0.10 max | ||||||||||
| 3 | FG/HT260/250 | A48 Class 35 | 2.9`3.2 | 0.9~1.1 | 0.15 max | 1.3~1.6 | 0.12 max | |||||||||
| 4 | FG/HT200 | A48 Class 30 | 3.1~3.4 | 0.8~1.0 | 0.15 max | 1.5~1.8 | 0.12 max | |||||||||
| 5 | FG/HT150 | A48 Class 20 | 3.2~3.5 | 0.5~0.58 | 0.2 max | 1.9~2.3 | 0.12 max | |||||||||
| 6 | iso 400-18 | F32800 | A536 60-40-18 | 3.50~3.78 | 0.2~0.5 | 0.03~0.06 | 2.80~2.85 | 0.02~0.04 | ||||||||
| 7 | iso450-10 | F33100 | A536 65-42-12 | 3.30~3.80 | 0.2~0.5 | 0.03~0.06 | 2.40~2.90 | 0.02~0.04 | ||||||||
| 8 | iso 500-7 | A536 70-50-05 | 3.20~3.60 | 0.4~0.6 | ≤0.4 | 0.03~0.06 | 2.30~2.90 | 0.02~0.04 | ||||||||
| 9 | iso 600-3 | A536 80-60-03 | 3.00~3.50 | 0.3~0.5 | 0.30~0.40 | 0.03~0.06 | 2.40~2.80 | 0.02~0.04 | ||||||||
| 10 | iso 700-2 | F34800 | A536 100-70-03 | 3.65~3.90 | 0.3~0.5 | 0.30~0.40 | ≤0.06 | 1.70~1.90 | ≤0.03 | Sn: 0.03~0.06 | ||||||
| 11 | iso 800-2 | F36200 | A536 120-90-02 | |||||||||||||