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4140 seamless steel oil well pipe
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4140 Seamless Steel Oil Well Pipe 30-139.7mm OD for High-Pressure Drilling
4140 vs 4130 Oilfield Drilling Pipe Performance Comparison – Core Advantages of 4140 Grade
In the oilfield drilling sector, steel selection directly determines the load-bearing capacity, wear resistance, and long-term reliability of drill pipes and casings. Below is a comparison of key parameters between 4140 and 4130 grades, highlighting the core advantages of 4140-grade drilling pipes to help you make an informed choice.
I. Core Parameter Comparison: Why 4140 Outperforms
|
Performance Metric
|
4130 Grade (Benchmark)
|
4140 Grade (Our Product)
|
Advantage
|
| Tensile Strength |
≥813 MPa |
≥950 MPa |
17%+ higher – Handles ultra-high well pressures with ease, reducing burst risks. |
| Yield Strength |
≥690 MPa |
≥850 MPa |
23% higher – Stronger resistance to deformation, ensuring wellbore structural stability. |
| Elongation |
≥15% |
≥14% |
Slightly lower but balanced by high-strength toughness design. |
| Hardness (HRC) |
≥24 |
28–33 |
Significantly harder – Enhanced wear resistance, minimizing drill cuttings abrasion. |
| Delivery Condition |
Stress Relief Annealed (+SR) |
Quenched & Tempered (QT) |
QT process balances strength and toughness, combining hardness with impact resistance. |
| Typical Applications |
Conventional medium-low pressure wells, short-depth drilling |
High-pressure deep wells, complex formations, long horizontal sections |
Engineered for extreme load conditions. |
II. Four Core Advantages of 4140-Grade Drilling Pipes
1. Extreme High Strength: Greater Load Capacity, Higher Safety
4140 grade achieves its superior performance through higher carbon content (0.38–0.43) and alloy reinforcement (Cr 0.80–1.10, Mo 0.15–0.25). The quenched & tempered (QT) process delivers a tensile strength of ≥950 MPa and yield strength of ≥850 MPa—17% and 23% higher than 4130, respectively. This enables it to withstand greater downhole pressures, tension, and torque, making it ideal for high-pressure deep wells, complex formations (e.g., hard rock, fault zones), and reducing risks of fractures or deformations for safer operations.
2. Superior Wear Resistance: Extended Lifespan, Lower Maintenance Costs
With a hardness range of 28–33 HRC (vs. 4130’s ≥24 HRC), 4140’s fine-quenched and tempered martensitic microstructure significantly enhances surface durability. It effectively resists drill cuttings impact, formation friction, and casing abrasion, minimizing wear-induced thinning or leaks. This extends the service life of drill pipes/casings, reducing downtime and replacement costs.
3. Balanced Toughness: Impact Resistance Without Brittleness, Adapting to Complex Conditions
Despite its higher hardness, 4140 maintains excellent toughness through precise QT process control. Compared to 4130’s stress relief annealed (+SR) state, 4140 better resists downhole shock loads (e.g., stuck pipe, jarring) and temperature fluctuations, avoiding brittle fractures. It is suited for long horizontal sections, extended-reach wells, and high-dynamic-stress environments.
4. Professional Adaptability: Designed for High-Challenge Drilling Scenarios
4140 is the ideal choice for high-pressure/high-temperature (HPHT) wells, ultra-deep wells, and highly abrasive formations. Whether for offshore oil development, shale gas horizontal wells, or directional drilling in complex structures, its integrated high-strength, high-hardness, and high-toughness properties meet extreme operational demands—whereas 4130 is better suited for conventional medium-pressure wells or cost-sensitive short-depth projects.
III. Why Choose Our 4140-Grade Drilling Pipes?
Higher Standards: Manufactured to strict API and industry performance requirements, with each pipe undergoing eddy current testing, dimensional precision checks, and surface quality inspections.
Customizable Solutions: Tailored hardness ranges (28–33 HRC) or anti-corrosion coatings available based on your well conditions.
End-to-End Service: From grade selection consulting to after-sales technical support, we provide integrated “material + solution” services.
4140-Grade Drilling Pipes – Built for Extreme Drilling, Delivering Safer and More Efficient Every Run.
Chemical Composition
| Steel Grade |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
B |
| 4130 |
0.28-0.33 |
0.15-0.35 |
0.40-0.60 |
≤0.040 |
≤0.040 |
0.80-1.10 |
0.15-0.25 |
|
| 4140 |
0.38-0.43 |
0.15-0.35 |
0.75-1.00 |
≤0.040 |
≤0.040 |
0.80-1.10 |
0.15-0.25 |
|
Mechanical Properties
| Steel Grade |
Deliver Condition |
Tensile Strength
(Mpa)
|
Yield Strength
(Mpa)
|
Elongation
(%)
|
Hardness(HRC) |
| 4130 |
+ SR |
≥813 |
≥690 |
≥15% |
≥24 |
| 4140 |
QT |
≥950 |
≥850 |
≥14% |
28 - 33 |
Delivery Condition
- 1.
+SR (BKS) — Stress Relief Annealing after Cold Working
- 2.
+N (NBK) — Normalizing
- 3.
QT — Quenching & Tempering
FAQ:
1. Can you provide a sample to check the quality?
We can provide free sample with same or similar sizes for you to check tube quality.
You need to in charge of Express costs.
2. How about your production capacity?
3000 tons/Month.
3. What are your terms of payment?
30%TT in advance, Balance to be paid before shipment.
4. Where is your factory?
Zhangjiagang city, 1.5 hours away from Shanghai.
5. How can I get the quotation A.S.A.P?
Please send us an inquiry with full details as following,quotation will sent to you A.S.A.P:
1). Tube Standard
2). Steel Grade
3). Tube Size and Size Tolerance
4). Tube length
5). Quantity
6). If any special requirements
6. How about the minimum order quantity?
Normally for one size above 1 ton.
Welcome to contact us! Thanks.
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