45MnMoB Grade Drilling Pipe: The Hard-Core Solution for Extreme Conditions
Engineered specifically for ultra-deep wells, high-pressure reservoirs, and highly abrasive formations, the 45MnMoB-grade drilling pipe combines a high-manganese-molybdenum alloy composition with enhanced mechanical properties to deliver unmatched reliability in challenging drilling environments.
Core Advantages
1. Extreme Load-Bearing
Tensile strength ≥790 MPa, hardness up to 28–32 HRC (after quenching & tempering), ensuring reliable performance in ultra-deep wells (>3,000m) and high-pressure formations (≥50 MPa).
2. Wear & Corrosion Resistance
High manganese (1.05–1.35%) and molybdenum (0.20–0.25%) content enhance abrasion resistance, while a refined microstructure improves fracture toughness for extended service life in harsh conditions.
3. Balanced Toughness
Elongation ≥14% balances strength and ductility, effectively absorbing sudden impacts (e.g., stuck pipe, vibration) to prevent brittle failure.
4. Specialized Adaptability
Optimized for hard rock, high-sand content, and complex formations. Optional quenching & tempering (QT) treatment further increases surface hardness (up to 32 HRC) for enhanced durability.
Why Choose 45MnMoB?
Tougher and more wear-resistant than conventional carbon steels (e.g., 1541), yet more cost-targeted than 4130/4140—designed specifically for high-demand drilling scenarios.
Mn-Mo alloy formula + precision engineering ensures high-temperature stability and fatigue resistance, meeting modern deep-well requirements.
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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