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:
1.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).
2.Cold-Drawn Precision: Tight tolerances and smooth bores minimize fluid resistance, improve mud flow efficiency, and extend tool joint life.
3.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.
4.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.
1. Stress Relief Annealing after Cold Working (+SR) (BKS)
2. Normalizing (+N) (NBK)
3. Quenching & Tempering (QT)
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