73mm 89mm Forged One-Piece Cold-Drawn 4140 Alloy Steel HDD Drill Pipe for Trenchless Drilling
Price:
Negotiable
MOQ:
1MT
Delivery Time:
Negotiable
Brand:
HONGBAO
Product Description
73mm / 89mm Forged One Piece Cold Drawn 4140 HDD Drill Pipe For Trenchless Drilling
73mm / 89mm Forged One-Piece Cold-Drawn HDD Drill Pipe for Trenchless Drilling
Designed for the rigors of modern trenchless technology, our 73mm/89mm Forged One-Piece Cold-Drawn HDD Drill Pipes deliver uncompromising strength, precision, and durability for horizontal directional drilling (HDD) applications. Engineered to excel in complex underground environments—from urban utility installation to long-distance pipeline routing—these pipes are the backbone of efficient, low-disruption drilling operations.
Crafted from high-strength alloy steel (e.g., 42CrMo or equivalent), the drill pipes undergo a forged one-piece manufacturing process to eliminate weld seams, a critical weakness in multi-piece designs. This seamless structure, combined with cold-drawing technology, ensures exceptional dimensional accuracy (outer diameter tolerance ±0.1mm, straightness ≤0.3mm/m) and a smooth inner surface (Ra ≤1.6μm), reducing friction and torque loss during drilling. The cold-drawing process also refines the steel's grain structure, enhancing tensile strength (≥1100 MPa) and yield strength (≥950 MPa) to withstand extreme axial loads, torsional stress, and abrasive geological conditions (e.g., hard rock, gravel, or clay).
Key Features & Benefits
- Forged One-Piece Construction: No welds = no weak points. Resists fatigue cracking and torsional failure in long-reach or high-torque drilling (max torque capacity: 25,000 N*m for 89mm, 15,000 N*m for 73mm).
- Cold-Drawn Precision: Tight tolerances and smooth bores minimize fluid resistance, improve mud flow efficiency, and extend tool joint life.
- Corrosion & Wear Resistance: Optional surface treatments (e.g., nitriding, phosphate coating) protect against mud chemicals and abrasive wear, ideal for high-salinity or rocky formations.
- Size Versatility: Available in 73mm (2-7/8") and 89mm (3-1/2") outer diameters, with lengths from 3m to 6m (customizable), fitting most HDD rigs and drill string configurations.
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
- Stress Relief Annealing after Cold Working (+SR) (BKS)
- Normalizing (+N) (NBK)
- Quenching & Tempering (QT)
Frequently Asked Questions
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
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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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Jiangsu Hongbao Group Co., Ltd.
Location
DAXIN TOWN,ZHANGJIAGANG,JIANGSU P.R.CHINA
Contact Person
Angela