Chemical Composition
| Grade | N | C | H | Fe | O | Al | V | Pa | Mo | Ni | Ti |
| Gr1 | 0.03 | 0.08 | 0.015 | 0.2 | 0.18 | / | / | / | / | / | bal |
| Gr2 | 0.03 | 0.08 | 0.015 | 0.3 | 0.25 | / | / | / | / | / | bal |
| Gr3 | 0.05 | 0.08 | 0.015 | 0.3 | 0.35 | / | / | / | / | / | bal |
| Gr4 | 0.05 | 0.08 | 0.015 | 0.5 | 0.4 | / | / | / | / | / | |
| Gr5 | 0.05 | 0.08 | 0.015 | 0.4 | 0.2 | 5.5~6.75 | 3.5~4.5 | / | / | / | bal |
| Gr7 | 0.03 | 0.08 | 0.015 | 0.3 | 0.25 | / | / | 0.12~0.25 | / | / | bal |
| Gr9 | 0.03 | 0.08 | 0.015 | 0.25 | 0.15 | 2.5~3.5 | 2.0~3.0 | / | / | / | bal |
| Gr12 | 0.03 | 0.08 | 0.015 | 0.3 | 0.25 | / | / | / | 0.2~0.4 | 0.6~0.9 | bal |
Tensile Requirements
| Grade | Tensile strength(min) | Yield Strength(min) | Elongation(%) | ||
| ksi | MPa | ksi | MPa | ||
| Gr1 | 35 | 240 | 20 | 138 | 24 |
| Gr2 | 50 | 345 | 40 | 275 | 20 |
| Gr3 | 65 | 450 | 55 | 380 | 18 |
| Gr4 | 80 | 550 | 70 | 483 | 15 |
| Gr5 | 130 | 895 | 120 | 828 | 10 |
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Aflola
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