Drill Pipe

Drill Pipe

  1. Full API 5DP compliance, grades E75, X95, G105, S135 and domestic alloy 4145H, 35CrMo
  2. Inertia friction welded heavy‑duty tool joints for high torque underground operation
  3. Multiple standard NC thread types: NC26, NC31, NC38, NC40; standard R2 length 9.14 m
  4. High torsional & tensile performance, fit for oil‑gas, HDD, water well, geological and mine drilling
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Product Overview

Drill Pipe is a high-strength alloy drilling tool designed for underground drilling operations and manufactured according to API Spec 5DP, SY/T 5290 and GB/T 2970 standards. It is produced using high-performance alloy materials including 4145H, 35CrMo and API grades E75, X95, G105 and S135 to meet different drilling depth and torque requirements.

Designed for demanding drilling environments, this drill pipe provides reliable torque transmission, tensile performance and connection strength through friction-welded heavy-duty tool joints. The upset thickened tool joint structure and inertia friction welding process help maintain stable performance during high-load rotation, pulling-out and impact operations.

The product supports multiple NC thread connection types, including NC26, NC31, NC38 and NC40, with the industry-standard R2 length of 9.14 m for compatibility with mainstream drilling rigs and down-hole assemblies.

Drill Pipe is widely used in oil and gas wells, coal-bed methane exploration, water well construction, geological exploration, horizontal directional drilling (HDD), mine ventilation drilling and rock bolt anchoring projects. Different steel grades can be selected according to drilling depth, load conditions and operating environment.

Drill Pipe

Chemical & Mechanical Property Snapshot

Grade C (%) Mn (%) P (%) Max S (%) Max Yield Strength (MPa) Tensile Strength (MPa) Elongation (%) Hardness (HRC)
E75 0.24–0.28 1.20–1.50 0.020 0.015 517–655 ≥689 ≥19 ≤22
X95 0.26–0.30 1.25–1.55 0.020 0.015 655–758 ≥724 ≥18 ≤26
G105 0.28–0.32 1.30–1.60 0.020 0.015 724–827 ≥793 ≥17 ≤28
S135 0.30–0.35 1.35–1.65 0.020 0.015 931–1069 ≥1000 ≥15 ≤32
4145H 0.42–0.49 0.65–1.10 0.025 0.025 830–980 ≥980 ≥14 28–34
35CrMo 0.32–0.40 0.40–0.70 0.025 0.025 ≥835 ≥980 ≥12 28–32

Detailed Technical Specifications

Item Details
Product Name Drill Pipe
Applicable Standards API Spec 5DP, SY/T 5290, GB/T 2970
Material Grades 4145H, 35CrMo, E75, X95, G105, S135
Common Outer Diameter 2-3/8″, 2-7/8″, 3-1/2″, 4″, 4-1/2″
Standard Length R2: 9.14 m
Tool Joint Type Upset thickened tool joint
Welding Method Inertia friction welding
Thread Connection NC26, NC31, NC38, NC40
Connection Performance High torque transmission, tensile load resistance, impact resistance
Application Depth Selection E75 for shallow/light-load drilling; G105 and S135 for deeper high-torque environments
Inspection Process Dimensional measurement, thread inspection, mechanical property testing, non-destructive testing
Certification Document Mill Test Certificate supplied for each batch
Thread Protection Protective caps installed on both ends for transportation protection
MOQ 5 Ton
Payment Terms T/T, L/C at Sight
Delivery Time 7–15 working days after receiving deposit
Package Waterproof paper + galvanized steel strap + seaworthy export wooden pallet

Dimension Table

Nominal Size (inch) OD (mm) Wall Thickness (mm) ID (mm) Unit Weight (kg/m) Thread Type Standard Length Range
2-3/8″ 60.33 4.83 50.67 16.02 NC26 / NC31 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
2-7/8″ 73.03 5.51 62.01 23.29 NC31 / NC38 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
3-1/2″ 88.90 5.49 77.92 29.76 NC38 / NC40 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
4″ 101.60 6.65 88.30 38.23 NC44 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
4-1/2″ 114.30 6.88 100.54 44.50 NC46 / NC50 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
5″ 127.00 7.52 111.96 53.41 NC50 / NC56 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
5-1/2″ 139.70 7.72 124.26 61.70 NC56 / NC61 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m
6-5/8″ 168.28 8.38 151.52 81.58 NC70 R1: 5.49–6.71 m / R2: 8.23–9.14 m / R3: 11.58–13.72 m

Product Comparison Table

Product Main Function Material / Standard Key Characteristics Typical Applications
Drill Pipe E75 Transfers torque and drilling force between surface equipment and drill bit API Spec 5DP, E75 Friction-welded tool joints, NC threads, medium tensile strength & torque, cost-effective Shallow wells, water wells, light-load geological drilling
Drill Pipe X95 Transfers torque and drilling force between surface equipment and drill bit API Spec 5DP, X95 Higher tensile strength, good impact resistance, medium-heavy load Medium-depth oil & gas wells, HDD horizontal directional drilling
Drill Pipe G105 Transfers torque and drilling force between surface equipment and drill bit API Spec 5DP, G105 High torque & tensile performance, fatigue-resistant Deep oil & gas wells, coal bed methane drilling
Drill Pipe S135 Transfers torque and drilling force between surface equipment and drill bit API Spec 5DP, S135 Ultra-high strength, heavy torque, high load capacity Ultra-deep wells, high-pressure high-torque mining drilling
Drill Pipe 4145H Transfers torque and drilling force between surface equipment and drill bit SY/T 5290, 4145H alloy steel Excellent abrasion and impact resistance Heavy-duty mine drilling, rock bolt anchoring projects
Drill Pipe 35CrMo Transfers torque and drilling force between surface equipment and drill bit GB/T 2970, 35CrMo alloy steel Good toughness, stable performance under dynamic load Geological exploration, mine ventilation drilling
Carbon Steel Seamless Steel Pipe Fluid and pressure transportation ASTM A106, GB/T 8163 and related standards No weld seam, suitable for pressure systems Boilers, hydraulic systems, chemical pipelines
Carbon Steel Welded Steel Pipe Structural and pipeline applications GB/T 3091, API, ASTM standards ERW / SSAW / LSAW production methods Water transmission, structural applications, large pipelines
API Oil / Casing Pipe Oilfield casing and tubing applications API Spec 5CT Designed for oil and gas wells Drilling casing and production wells
Stainless Steel Pipe Corrosion-resistant pipeline solutions ASTM / JIS / EN standards Excellent corrosion resistance Chemical, food, and sanitary industries

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Drilling for Oil and Gas Exploration

Water Well Drilling

Drilling for Geological Exploration

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

Drill Pipe is manufactured according to API Spec 5DP, SY/T 5290 and GB/T 2970 standards to meet drilling industry requirements.

Drill Pipe is available in 4145H, 35CrMo, and API grades including E75, X95, G105 and S135 for different drilling conditions.

The product supports NC26, NC31, NC38 and NC40 thread connection options for compatibility with different drilling equipment.

It is widely used in oil and gas wells, water wells, HDD horizontal directional drilling, geological exploration, coal-bed methane and mining projects.

Yes. Material grades, sizes, thread connections and other configurations can be selected according to drilling conditions and project requirements.

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  • ISO, SGS, TÜV, WTRUST, Lloyd’s Register, and DNV certifications

  • Customizable sizes, grades, and surface finishes

  • Full material traceability and inspection reports

  • Responsive support and fast global delivery


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