Low-temp stud bolts
ASTM A320 L7 — chemistry & properties
ASTM A320 L7 (Low-temp stud bolts, UNS G41400): chemical composition and mechanical properties. Low-temperature flange bolting to -101 °C (dia ≤ M65 / 2½ in.)
Chemical composition (wt %)
| C | 0.38 – 0.48 |
| Mn | 0.75 – 1 |
| P | ≤ 0.035 |
| S | ≤ 0.04 |
| Si | 0.15 – 0.35 |
| Cr | 0.8 – 1.1 |
| Mo | 0.15 – 0.25 |
Mechanical properties
| Tensile strength, min | 860 MPa |
| Yield strength, min | 725 MPa |
| Elongation, min | 16 % |
| Impact test | Charpy at −101 °C |