AISI 4130 low alloy steel containing nominally 0.3% carbon, 1% chromium and 0.2% molybdenum is widely used in oil patch applications. It is similar to 4140 which has a higher carbon level giving 4130 improved weldability, at the expense of through thickness strength. The material characteristics lends itself to a wide variety of surface and subsea applications such as flanges, casing hangers, riser spools and hose connectors.
The hardenability limitations of this grade (depth to which it will harden / obtain the specified mechanical properties after heat treatment) must always be taken into account when designing and selecting equipment. With targeted cast analysis and Howco’s heat treatment control, the increased, demanding requirements of 10”ER QTCs per API 6A 21st edition can be satisfied.
| Element | Min | Max |
|---|---|---|
| C | 0.28 | 0.33 |
| Si | 0.15 | 0.40 |
| Mn | 0.40 | 0.60 |
| P | - | 0.035 |
| S | - | 0.040 |
| Cr | 0.80 | 1.10 |
| Mo | 0.15 | 0.25 |
| Fe | 0.00 | - |
| Property | Value |
|---|---|
| U.T.S | 95 KSI Min (655 N/mm2) |
| 0.2% Proof Stress | 75 KSI Min (517 N/mm2) |
| Elongation | 18% |
| Red of Area | 35% |