Complete specifications for AISI 4130, a chromium-molybdenum low alloy steel with excellent weldability and strength for oil patch and aerospace applications.
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 lend itself to a wide variety of surface and subsea applications such as flanges, casing hangers, riser spools and hose connectors. With targeted cast analysis and controlled heat treatment, demanding API 6A 21st edition requirements 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 | Balance | Balance |
| Treatment | Temperature | Cooling | Purpose |
|---|---|---|---|
| Normalization | 1600-1700°F (871-927°C) | Air cool to room temperature | Refine grain structure and improve machinability |
| Hardening | 1575-1625°F (857-885°C) | Oil quench | Develop maximum hardness and strength |
| Tempering | 800-1300°F (427-704°C) | Air cool | Reduce brittleness while maintaining strength |
Excellent weldability with good strength for oil patch applications
High strength-to-weight ratio with excellent fatigue resistance
Superior weldability for fabricated structures with good impact resistance
Get competitive pricing on high-quality AISI 4130 steel with complete material certifications, heat treatment services, and API 6A compliance documentation.