Premium Oil & Gas Drilling Pipes (4140 Grade) – Unmatched Strength & Durability​​
​​1. Exceptional Mechanical Strength for Extreme Conditions​​
​​Tensile Strength: ≥950 MPa​​ (Superior resistance to burst and collapse under ultra-high downhole pressures, ideal for deep/complex wells).
​​Yield Strength: ≥850 MPa​​ (Maintains structural integrity under heavy loads, preventing deformation even in prolonged drilling operations).

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2. Optimized Hardness for Enhanced Wear Resistance (28–33 HRC)​​
Hardened surface (quenched & tempered) delivers ​​superior abrasion resistance​​ against drilling cuttings and formation friction, extending service life.
Controlled hardness range ensures ​​balance between toughness and durability​​, avoiding brittleness while maximizing wear protection.

​​3. Reliable Performance via Quenching & Tempering (QT Process)​​
​​ QT (Quenched & Tempered) delivery condition​​ refines microstructure, eliminating internal stresses and enhancing uniformity in strength/hardness.
Delivers ​​consistent mechanical properties​​ across the entire pipe length, critical for reliable performance in variable well conditions.

​​4. Superior Fatigue & Impact Resistance​​
High-strength Cr-Mo alloy (Chromium-Molybdenum) base improves ​​cyclic load resistance​​ (vital for extended reach drilling and repeated tripping operations).

Maintains ​​impact toughness​​ even at elevated hardness levels, reducing the risk of sudden failure under dynamic stresses.

​​5. Proven Alloy Composition (4140 Steel)​​
Chromium (0.80–1.10%)​​ enhances corrosion resistance in mildly aggressive fluids (better than standard carbon steels).

​​Molybdenum (0.15–0.25%)​​ boosts high-temperature stability, ensuring reliability in hot wells or during cementing operations.

Excellent weldability​​ (with proper pre/post-weld heat treatment), facilitating field repairs or custom connections.

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6. Ideal for Demanding Applications​​
Perfect for ​​deep drilling​​, ​​high-pressure/high-temperature (HPHT) wells​​, and ​​abrasive formations​​ where maximum strength and wear resistance are non-negotiable.

Also suitable for ​​heavy-duty casing/tubing​​ requiring long-term durability in challenging environments.

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Why Choose Our 4140 Drilling Pipes?​​
​​1. Ultimate Strength​​ – Outperforms standard grades (e.g., 4130) with higher tensile/yield values, ideal for critical well sections.

2. Longer Service Life​​ – Hardness (28–33 HRC) and wear resistance minimize downtime from pipe damage or erosion.

3. Engineered Reliability​​ – QT process ensures consistent performance, reducing the risk of unexpected failures.

4. Global Compliance​​ – Meets/exceeds API and industry standards for high-performance drilling applications.

Applications include fore poling (advance support), mine blasting, water well drilling, geothermal well drilling, and coal/nonferrous metal mining.​​

Chemical Composition

Mechanical Properties

Delivery Condition:

1. Stress Relief Annealing after Cold Working (+SR) (BKS)

2. Normalizing (+N) (NBK)

3. Quenching & Tempering (QT)

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.