ASTM A320 Grade L7 Chemical Composition
Find typical requirement for ASTM A320 Grade L7 Chemical Compositions with allowable variation. Chemical analysis of raw material or finished products manufactured to ASTM A320 Grade L7 specification must comply with below analysis. The chemical composition is equivalent to Alloy A286 or UNS S66286 stainless steel used as a raw material to produce 660 bolts, studs and nuts.
| ASTM A320 Grade L7 Chemical Composition Note | ||
| Elements | Range | Variation, % |
| Carbon | 0.38 - 0.48C | 0.02 |
| Manganese | 0.75 - 1.00 | 0.04 |
| Phosphorus, max | 0.035 | 0.005 over |
| Sulfur, max | 0.040 max | 0.005 over |
| Silicon | 0.15 - 0.35 | 0.02 | Chromium | 0.80 - 1.10 | 0.05 |
| Molybdenum | 0.15 - 0.25 | 0.02 |
Note : Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H.