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DIN2391 drill rod tube
, 42CrMo steel oil drilling pipe
, core barrel inner tube
DIN2391 Drill Rod Tube 42CrMo Steel Grade Oil Drilling Pipe Core Barrel Inner Tube & Outer Tube
4140(42CrMo/42CrMo4) Grade Drilling Pipe – The Powerhouse for Extreme Oilfield Challenges
When conventional drilling pipes falter under pressure, 4140 grade drilling pipe steps up as the ultimate workhorse for the most demanding oilfield operations. Forged with high-strength chromium-molybdenum (Cr-Mo) alloy and engineered through precision heat treatment, this premium-grade pipe redefines performance in high-pressure, high-wear, and high-stress environments.
Why 4140
1. Unmatched Load-Bearing Capacity
Tensile Strength: ≥950 MPa | Yield Strength: ≥850 MPa – Outperforms standard grades by 15–20%, ensuring rock-solid stability in ultra-deep wells (>3,000m) and high-pressure reservoirs (≥50 MPa). Whether drilling through hard rock formations or enduring extreme torque, 4140 maintains structural integrity where others weaken.
2. Elite Wear & Abrasion Resistance
Hardness: 28–33 HRC (Hardened & Tempered) – Nearly double the hardness of conventional carbon steels (e.g., 1541), 4140’s hardened martensitic microstructure fights off drill cuttings, sandstone abrasion, and casing friction. This translates to longer service life and fewer replacements in abrasive formations.
3. Engineered for Extreme Conditions
Quenched & Tempered (QT) Process – Delivers the perfect balance of hardness and toughness. Unlike brittle high-hardness steels, 4140 absorbs sudden impacts (e.g., stuck pipe, pressure spikes) without cracking, ensuring reliable performance in volatile wellbore conditions.
Cr-Mo Alloy Synergy – Chromium enhances corrosion resistance in mildly aggressive fluids (e.g., brine, CO₂), while molybdenum boosts high-temperature stability and fatigue resistance for long-cycle drilling operations.
4. Smart Cost-to-Performance Ratio
While premium-priced compared to 1541 or 4130, 4140 delivers exponential value by reducing downtime, repair costs, and casing failures in harsh environments. Its extended service life and failure-resistant design make it a smart investment for high-stakes drilling projects.
Applications include fore poling (advance support), mine blasting, water well drilling, geothermal well drilling, and coal/nonferrous metal mining.
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 |
|
| 45MnMoB |
0.43-0.48 |
0.17-0.37 |
1.05-1.35 |
≤0.020 |
≤0.015 |
|
0.20-0.25 |
0.001-0.005 |
|
1541
|
0.36-0.44 |
- |
1.35-1.65 |
≤0.040 |
≤0.050 |
|
|
|
|
30CrMnSiA
|
0.28-0.34 |
0.90-1.20 |
0.80-1.10 |
≤0.020 |
≤0.015 |
0.80-1.10 |
|
|
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 |
| 45MnMoB |
+ N |
≥790 |
≥600 |
≥14% |
- |
| 1541 |
+ SR |
≥813 |
≥690 |
≥15% |
≥24 |
| 30CrMnSiA |
QT |
≥850 |
≥750 |
≥14% |
26 - 31 |
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.
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