AISI 4135 (35CrMo)
Cr-Mo quench-and-temper alloy steel — the lower-carbon version of 4140 (42CrMo4). Lower C (0.33-0.38%) gives better weldability and toughness than 4140 with slightly lower strength. Primarily a US/ASTM designation. Used for drill pipe, tubing, couplings, and oil field applications where weldability matters more than maximum strength.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 4135 | — | REF |
| 🇪🇺 | EN | Europe | 34CrMo4 (1.7220) approx | 1.7220 | 85% |
Sources: ASTM A29, EN 10083-3
Mechanical properties — Pro
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Elastic Modulus | ||
| Density |
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