Choosing between AISI 4130 and 4140 alloy steels for oil and gas drilling equipment depends on the specific application requirements. Below is a detailed comparison to help you make an informed decision:
1. Chemical Composition (Weight %)
| Element | AISI 4130 | AISI 4140 |
|---|---|---|
| Carbon (C) | 0.28–0.33% | 0.38–0.43% |
| Chromium (Cr) | 0.80–1.10% | 0.80–1.10% |
| Molybdenum (Mo) | 0.15–0.25% | 0.15–0.25% |
| Manganese (Mn) | 0.40–0.60% | 0.75–1.00% |
| Silicon (Si) | 0.15–0.35% | 0.15–0.35% |
2. Mechanical Properties
| Property | AISI 4130 | AISI 4140 |
|---|---|---|
| Yield Strength (ReH) | ≥ 435 MPa (63,000 psi) | ≥ 655 MPa (95,000 psi) |
| Tensile Strength (Rm) | 670–980 MPa (97,000–142,000 psi) | 850–1000 MPa (123,000–145,000 psi) |
| Elongation (A) | ≥ 18% | ≥ 16% |
| Charpy V-Notch Impact | ≥ 27 J (20 ft-lb) at -18°C (0°F) | ≥ 27 J (20 ft-lb) at -18°C (0°F) |
3. Key Differences
| Aspect | AISI 4130 | AISI 4140 |
|---|---|---|
| Strength | Lower | Higher |
| Hardness | Lower | Higher |
| Weldability | Better | Good |
| Cost | Lower | Higher |
4. Applications in Oil & Gas Drilling Equipment
| Component | AISI 4130 | AISI 4140 |
|---|---|---|
| Drill Collars | Suitable | Preferred |
| Tool Joints | Suitable | Preferred |
| Casing and Tubing | Preferred | Suitable |
| Valve Bodies | Suitable | Preferred |
5. When to Choose AISI 4130 vs. 4140
Choose AISI 4130 if:
The application requires good weldability and moderate strength.
Cost-effectiveness is a priority.
Choose AISI 4140 if:
The application demands higher strength and hardness.
The component is subject to extreme wear and stress.
If you need further guidance on material selection for a specific application, feel free to ask!
Just like you, 70% customers choose long-term cooperation with BBN steel not only for our good product and service quality, good reputation in the international market, but also for our experienced one-stop raw material supply and further steel processing!
