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Help CenterSteel Pipe & Tube & OCTG Pipe，Grade B、X42、X52、X60、X65、X70、X80
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1. Product Overview
Petroleum pipes (OCTG-Oil Country Tubular Goods) are high-strength alloy seamless & welded steel pipes specially used for oil & gas exploration, drilling, production, gathering and long-distance transportation. They are divided into four major categories: casing, tubing, drill pipe and line pipe. Manufactured with Cr-Mn-Mo-V low-alloy materials and quenched & tempered heat treatment, they can withstand extreme downhole conditions including high temperature, high pressure, collapse load, tensile force, H₂S & CO₂ corrosion. Complying strictly with international API petroleum standards and domestic special national standards for oil & gas, they are core special tubular products for oilfield development and long-distance oil & gas pipelines.
Applicable Standards
Core International API StandardsAPI 5CT (Casing & Tubing), API 5L (Line Pipe), API 5DP (Drill Pipe), API 5B (Thread Inspection)
Domestic National StandardsGB/T 9711, GB/T 19830, GB/T 28726, SY/T 6194
Equivalent International Standards: ISO 11960, ISO 3183
2. Product Classification & Common Steel Grades
2.1 Casing & Tubing (API 5CT)
For wellbore support and oil & gas lifting in production wells
Shallow wells: J55, K55, cost-effective for normal atmospheric pressure oil wells
Medium-deep wells: N80, L80, resistant to mild hydrogen sulfide corrosion, suitable for 2000–4000m well depth
Deep high-pressure wells: P110, ultra-high collapse & tensile resistance, for wells deeper than 4000m and high-pressure hydrocarbon wells
2.2 Line Pipe (API 5L)
For oilfield gathering and long-distance oil & gas trunk pipelines, divided into PSL1 basic grade and PSL2 high grade
Grades: Grade B, X42, X52, X60, X65, X70, X80
Manufacturing types: Seamless pipe, LSAW longitudinal submerged arc welded pipe, SSAW spiral submerged arc welded pipe, ERW high-frequency resistance welded pipe
2.3 Drill Pipe (API 5DP)
Tubular string for drilling operation, with thickened upset ends, excellent torsion resistance, wear resistance and fatigue resistance
3. Complete Production Process
Seamless Casing / Tubing / Drill Pipe Process
Refined steel billet incoming flaw detection → High-temperature heating → Piercing & hot rolling → Sizing & wall reducing → Cooling → Quenching & tempering heat treatment → Straightening → Cutting & threading (STC round thread / BTC buttress thread / premium airtight connection) → Coupling phosphating & copper plating → 100% non-destructive testing → Hydrostatic pressure test → Thread protection → Anti-rust coating → Marking & coding → Packing & warehousing
Welded Line Pipe Process
Steel plate/strip uncoiling & cutting → Rolling into pipe blank → Submerged arc / high-frequency welding → Post-weld heat treatment for stress relief → Expanding & rounding → NDT (UT/RT) → Hydrostatic test → 3PE external anti-corrosion / internal coating treatment → Fixed-length cutting → Marking & packing
4. Core Specification & Technical Parameters
Outer Diameter Range
Tubing: 60.3mm–114.3mm
Casing: 139.7mm–508mm
Line Pipe: 21.3mm–1422mm
Drill Pipe: 73mm–168mm
Wall Thickness Range: 4.5mm–60mm, standard & extra-heavy wall thickness per API standard with strictly controlled tolerance
Standard Fixed LengthCasing & tubing: 9.6m / 10.36m; Line pipe: 6m / 12m; Drill pipe: 9.14m, customized non-standard lengths available
Heat Treatment PerformanceAll products delivered under quenched & tempered condition with grain refinement and eliminated rolling stress. Superior tensile strength, yield strength and impact toughness, low risk of brittle fracture under low temperature; excellent anti-collapse, internal pressure resistance and tensile performance to bear complex downhole loads.
Optional Thread Types
STC Round Thread: Widely used for shallow wells, easy assembly & disassembly
BTC Buttress Thread: For medium-deep wells, high torque, reliable sealing and anti-slip performance
Premium Airtight Thread: For high-pressure sulfur-bearing gas wells, metal-to-metal sealing with zero leakage
Anti-Corrosion Treatment Options
Downhole casing & tubing: Thread phosphating & copper plating, special thread sealing grease, anti-rust oil on pipe body
Surface long-distance pipeline: 3PE three-layer polyethylene external anti-corrosion, fusion bonded epoxy internal coating, coal tar epoxy coating
Pressure Bearing PerformanceHydrostatic test pressure of each pipe far exceeds actual downhole working pressure; X70/X80 trunk line pipe can operate stably under delivery pressure above 10MPa long-term.
5. Core Product Advantages
Adaptable to extreme complex downhole working conditionsLow-alloy quenched & tempered material integrates high strength, collapse resistance, tensile resistance and H₂S/CO₂ corrosion resistance, suitable for deep wells, sulfur-bearing wells and offshore wells.
Reliable thread sealing performanceThread machining and full gauge inspection strictly in accordance with API 5B standard; premium airtight connections adopt metal hard seal to eliminate leakage under high pressure, reducing safety risks in downhole operation.
100% strict non-destructive testingPipe body and welds fully inspected by ultrasonic (UT), magnetic particle (MT) and eddy current (ET) testing to eliminate internal defects such as cracks, laminations and pores, 100% passing rate before delivery.
Precise size & weight controlWeight tolerance strictly complies with API standard, each pipe marked with actual weight, convenient for downhole string weight matching and engineering measurement accounting.
Complete anti-corrosion systemMature anti-corrosion processes matched for downhole and surface pipelines respectively, greatly extending service life of buried and downhole pipes.
Sufficient stock & stable delivery cycleFull series of steel grades and specifications in stock, shipped directly from Tianjin Port, production & delivery cycle 5–7 days. Customized special threads, extra-heavy wall thickness and dedicated anti-corrosion coatings available for bulk orders.
6. Main Application Fields
Onshore oil & gas drilling: Oil well casing, production tubing, drill pipe, downhole pup joints, supporting pipes for centralizers
Long-distance oil & gas pipeline network: Oilfield gathering pipelines, cross-provincial trunk oil & gas transmission pipelines, urban gas main pipes
Offshore oil & gas platforms: Subsea pipelines, offshore production well casing, platform process pipelines
Oil refinery & chemical plant: Crude oil delivery, finished oil & high-pressure natural gas process pipelines
Coalbed methane & shale gas development: Casing and production pipelines for shallow & deep shale gas wells
Geothermal & water injection wells: Temperature-resistant casing for formation water injection and geothermal exploitation
7. Factory Inspection & Qualification Documents
Full-item inspection for every pipe per batch, complete supporting documents attached for export shipment:
Visual, outer diameter, wall thickness, length and weighing dimensional inspection
Hydrostatic burst pressure test
100% ultrasonic, magnetic particle and eddy current non-destructive testing
Tensile, impact, hardness and collapse mechanical performance test
Thread dimension, sealing torque and interchangeability inspection
Chemical composition analysis and metallographic structure test
Factory certificate, API material test report, heat number traceability document, SGS third-party inspection report, CE certification document
8. Packaging, Marking & Logistics Delivery
Packaging
Casing & tubing: Plastic thread protectors on both ends, bundled with steel strips, separate protection for couplings; export goods can be packed in wooden cases for moisture & rust prevention
Large-diameter line pipe: Bundled with steel strips, plastic edge protectors at pipe ends to avoid bevel collision damage
MarkingPermanent printing on pipe body including standard number, steel grade, outer diameter × wall thickness, length, heat number, manufacturer, PSL level and thread type; product certificate label attached to each bundle.
LogisticsDirect shipment from warehouse to Tianjin Port, suitable for 20GP/40HQ full containers and bulk carrier loading; delivery cycle 5–7 days, full container and LCL export supported.
9. Comparison: Petroleum API Pipe VS Ordinary Alloy Seamless Steel Pipe
| Comparison Item | Special Petroleum API Pipe | Ordinary Alloy Seamless Steel Pipe |
|---|---|---|
| Applicable Standards | Special mandatory API 5CT/5L/5DP petroleum standards | General national standards for boiler & chemical alloy pipes |
| Mechanical Requirements | Mandatory assessment of collapse resistance, tensile resistance, torsion resistance and sulfur corrosion resistance for multiple downhole loads | Only normal/high temperature pressure resistance, no mandatory collapse or sulfur resistance requirements |
| Pipe End Processing | Precision API threads, premium airtight couplings with matching couplings | Only plain end, bevel end and simple threads, no special petroleum threads |
| Non-Destructive Testing | 100% full pipe mandatory inspection | Sampling inspection, no full testing requirement |
| Service Conditions | Deep oil & gas wells, high-pressure sulfur-bearing medium, long-distance high-pressure pipelines | Power plant boilers, general chemical high-temperature pipelines, not applicable for underground mining production |
| Precision Grade | Ultra-high tolerance for dimension, weight and threads | Conventional industrial tolerance, no weight control requirement |
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