API 2B ERW Steel Pipe 76mm

Product Description

API 2B ERW Steel Pipe 76mm is a high-performance electric resistance welded (ERW) steel pipe specially designed for oil and gas field surface pipelines, low-pressure petroleum transportation, and general industrial fluid delivery, with an outer diameter of 76mm (equivalent to DN65). Manufactured strictly in accordance with API 2B (Standard for Welded Steel Pipe for Oil Field Use), ASTM A53 Gr.B, and GB/T 3091 standards, the pipe adopts high-quality carbon steel strips and advanced high-frequency ERW welding technology. As a typical small-to-medium diameter ERW pipe, it features high production efficiency, uniform weld quality, excellent dimensional accuracy, and good corrosion resistance, which is consistent with the core characteristics of ERW pipes-welds formed by melting the base metal of the steel strip itself, with mechanical strength superior to ordinary welded pipes. Widely used in oil field gathering lines, low-pressure petroleum delivery pipelines, industrial water supply and drainage, and general fluid transmission systems, it provides a cost-effective and reliable pipeline solution for oil and gas field operations and industrial production. The ERW process adopted has the advantages of high production efficiency, low cost, material saving, and easy automation, making it widely used in the oil and gas field and industrial fields.

Basic Product Specifications

Product Name: API 2B ERW Steel Pipe 76mm

Executive Standard: API 2B, ASTM A53 Gr.B, GB/T 3091, GB/T 9711 (basic level)

Manufacturing Process: ERW (Electric Resistance Welding), high-frequency induction welding, steel strip precision forming, online weld annealing, cold sizing, straightening, surface anti-rust treatment

Steel Grades Available: ASTM A53 Gr.B, API 2B specified carbon steel, Q235B (low-alloy carbon steel for general industrial use)

Outer Diameter (OD): 76mm (fixed specification, consistent with API 2B small-diameter pipe requirements)

Wall Thickness (WT): 3.5mm - 10mm (custom thick-wall up to 12mm for high-pressure industrial scenarios)

Nominal Diameter (DN): DN65 (matching 76mm outer diameter for standard pipeline connection)

Delivery Condition: As-welded (standard for general use); Normalized (optional for low-temperature or high-stability requirements)

Standard Length: 6m / 12m (12m preferred for reducing on-site welding joints); Custom fixed lengths available (4m-12m)

Surface Finish: Black bare steel with internal and external anti-rust oil (standard); Hot-dip galvanized (HDG), Fusion Bonded Epoxy (FBE) anti-corrosion coating optional (for harsh working environments)

Pipe Ends: 30°/45° Beveled Ends (BE) for on-site welding (standard); Plain Ends (PE) or threaded ends (NPT/BSP) optional for quick connection

Application: Oil field surface gathering pipelines, low-pressure petroleum delivery lines, industrial fluid (water, gas, oil) transmission, oil depot auxiliary pipelines, chemical industry low-pressure fluid pipelines, general mechanical structure support

Grade & Process Explanation

Steel Grade for API 2B Standard: The core steel grade for API 2B ERW Steel Pipe 76mm is ASTM A53 Gr.B and API 2B specified carbon steel. ASTM A53 Gr.B has a minimum yield strength of ≥240MPa, tensile strength of 415-540MPa, and elongation ≥20%, with low sulfur (≤0.035%) and phosphorus (≤0.035%) content, ensuring good weldability and corrosion resistance-critical for long-term service in oil and gas field environments. Q235B low-alloy carbon steel is optional for general industrial scenarios, featuring stable mechanical properties and cost-effectiveness, suitable for low-pressure fluid transmission. These steel grades are widely used in ERW pipe production due to their excellent forming and welding performance.

ERW Process Advantages for 76mm Pipe: API 2B ERW 76mm pipes adopt high-frequency electric resistance welding technology, which utilizes the skin effect and proximity effect of high-frequency current to heat and melt the edge of the steel strip, then forms a firm weld under the action of extrusion rollers. The process realizes full-penetration longitudinal welding, and the weld seam undergoes online annealing (850-900℃) to eliminate internal stress, making its mechanical properties consistent with the base metal-effectively avoiding weld defects such as incomplete fusion and cracks. Compared with other welding processes, ERW has the advantages of high production efficiency, low cost, and uniform pipe wall thickness, which is especially suitable for the production of small-to-medium diameter pipes like 76mm. The entire production process is easy to automate, ensuring stable product quality batch after batch.

API 2B-Oriented Design: Strictly compliant with API 2B standard requirements, the pipe is optimized for oil field surface pipeline use-strict control of non-metallic inclusions to avoid pipeline blockage and corrosion; precise dimensional control ensures seamless connection with oil field valves, flanges, and other components. The smooth inner surface (Ra ≤12.5μm) reduces fluid resistance, preventing petroleum and industrial fluid deposition, which is consistent with the performance requirements of fluid transmission pipes. Optional anti-corrosion coatings (HDG/FBE) enhance resistance to soil corrosion and fluid corrosion, extending the service life of buried and harsh-environment pipelines.

Dimensional Tolerance (API 2B / ASTM A53 Standard)

Mechanical Properties (ASTM A53 Gr.B, API 2B Standard)

Note: Mechanical properties can be adjusted according to steel grade and wall thickness. For high-pressure oil field auxiliary pipelines (working pressure 4-6MPa), thick-wall (8-10mm) pipes are recommended to ensure pressure-bearing safety. The weld strength of ERW pipes is equivalent to the base metal, which can effectively withstand the cyclic pressure of fluid transmission.

Chemical Composition (Heat Analysis, Max. %, ASTM A53 Gr.B / API 2B Carbon Steel)

Residual elements: Cu ≤0.20%, Ni ≤0.15%, Cr ≤0.15%, Mo ≤0.08% (max. %); LF furnace refining is adopted to reduce non-metallic inclusions, improving weld quality and corrosion resistance, which is consistent with the quality requirements of API 2B standard for oil field pipes. Strict control of harmful elements ensures that the pipe will not cause contamination to petroleum and industrial fluids.

Manufacturing Process (ERW for API 2B 76mm Steel Pipe)

Raw Material Inspection: High-quality ASTM A53 Gr.B/API 2B carbon steel strips are selected, and strict inspection of chemical composition and mechanical properties is carried out before production-consistent with the raw material inspection requirements of ERW pipe production. The steel strips undergo pickling, derusting and oil removal to eliminate surface impurities, ensuring no contamination to the conveyed fluid and improving weld quality.

Steel Strip Forming: The steel strips are cold-formed into a cylindrical shape through intelligent forming rolls, with precise dimensional control to ensure uniform wall thickness and roundness. The out-of-roundness meets API 2B standard requirements, laying a foundation for subsequent welding and pipeline connection. The forming process ensures uniform deformation of the steel strip, small residual stress, and no scratches on the surface.

High-Frequency ERW Welding: High-frequency electric resistance welding is used to achieve full-penetration longitudinal welding. The weld seam undergoes online annealing (850-900℃) to eliminate internal stress, ensuring that the mechanical properties of the weld seam are consistent with the base metal-critical for preventing fluid leakage. The welding process utilizes the skin effect and proximity effect of high-frequency current to heat the edge of the pipe blank to the melting state, and forms a firm weld under the action of extrusion rollers. Weld seam 100% online ultrasonic testing is performed to eliminate welding defects such as cracks and incomplete fusion.

Sizing & Straightening: Precision sizing is carried out to meet API 2B and ASTM A53 dimensional tolerances; hydraulic straightening is used to ensure straightness ≤2.0 mm/m, facilitating on-site installation and reducing alignment difficulty. The sizing process further improves the dimensional accuracy of the pipe, ensuring the consistency of the outer diameter and wall thickness.

Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) of weld seams; Eddy Current Testing (ECT) of the pipe body (per API 2B and ASTM A53 standards). Full inspection ensures no internal defects that could affect pipeline safety, which is consistent with the non-destructive testing requirements of high-quality ERW pipes.

Heat Treatment (Optional): As-welded delivery is standard; normalized heat treatment is optional for low-temperature or high-stability requirements. The computer-controlled heat treatment furnace adjusts parameters according to the steel grade to ensure a uniform heat treatment effect and improve the low-temperature toughness of the pipe.

Finishing: Internal and external anti-rust oil coating is applied to prevent corrosion during storage and transportation; hot-dip galvanized/FBE anti-corrosion coating is available on request. Pipe ends are beveled (30°/45°) or processed into threaded ends, and clear marking is carried out to complete the production process. The finishing process ensures the surface quality of the pipe and facilitates on-site identification and use.

Product Advantages (Tailored for API 2B Application Scenarios)

API 2B Standard Compliance: Strictly manufactured in accordance with API 2B and ASTM A53 standards, fully meeting the quality requirements of oil field surface pipelines and low-pressure petroleum transportation, with complete certification documents to support project acceptance. The product performance is consistent with the requirements of API 2B standard for welded steel pipes for oil field use.

High-Quality ERW Weld: Advanced high-frequency ERW welding technology, full-penetration weld seam, online annealing to eliminate internal stress, weld mechanical properties consistent with the base metal, low leakage risk-suitable for long-term fluid transmission. The weld defect rate is low, and the structural stability is high, which is superior to ordinary welded pipes.

Precise Dimensional Accuracy: Strict control of outer diameter tolerance (±0.4mm) and roundness, ensuring seamless connection with oil field valves, flanges, and other components, reducing on-site installation errors and improving construction efficiency. The dimensional accuracy meets the requirements of API 2B and ASTM A53 standards, ensuring the interchangeability of the pipe.

Cost-Effective & Efficient: ERW process has high production efficiency and low manufacturing cost, balancing performance and economy-suitable for large-scale oil field and industrial pipeline construction. Compared with other welding processes, it has obvious cost advantages and can meet the needs of large-batch delivery.

Good Corrosion Resistance: Low-sulfur and low-phosphorus chemical composition, combined with optional HDG/FBE anti-corrosion coating, enhances resistance to soil corrosion and fluid corrosion, extending the service life of the pipeline (up to 25 years in general environments). It can adapt to the harsh working environment of oil fields and industrial sites.

Versatile Application: 76mm (DN65) specification is suitable for oil field gathering lines, low-pressure petroleum delivery, industrial fluid transmission, and other scenarios-strong versatility, meeting the needs of different industries. It can be used as both fluid transmission pipe and general mechanical structure pipe.

Full Traceability: Complete heat number and batch records, Mill Test Report (MTR) provided for each order, ensuring quality traceability and supporting pipeline inspection and maintenance. The entire production process is traceable, which is convenient for quality management and after-sales service.

Main Applications

Specialized for API 2B ERW Steel Pipe 76mm, widely used in:

Oil field surface gathering pipelines (crude oil, natural gas gathering and transportation).

Low-pressure petroleum delivery pipelines in oil depots and refineries.

Industrial fluid transmission (water, gas, oil, chemical reagents with low corrosion).

Auxiliary pipelines for oil field drilling and production equipment.

General mechanical structure support and low-pressure fluid pipeline systems.

Urban and industrial water supply and drainage, heating pipelines (with anti-corrosion coating).

Quality Inspection & Certification

Dimensional Inspection: Full inspection of outer diameter, wall thickness, length, straightness and out-of-roundness to meet API 2B and ASTM A53 tolerance requirements, ensuring compatibility with pipeline components. Each pipe is subject to strict dimensional inspection to ensure consistent quality.

Mechanical Property Testing: Tensile test, flattening test, bend test to verify yield strength, tensile strength and ductility; Charpy V-notch impact test optional for low-temperature environments. The test results are in line with API 2B and ASTM A53 standards, ensuring the mechanical performance of the pipe.

Hydrostatic Test: 100% pressure test at ≥1.2 times working pressure (minimum 5MPa), holding time per API 2B standard, ensuring no leakage or permanent deformation-critical for fluid transmission safety. The pressure test is carried out by a microcomputer-controlled device to ensure the accuracy of the test parameters.

Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) for weld seams; 100% Eddy Current Testing (ECT) for pipe body; RT testing available on request to ensure weld integrity and eliminate leakage risks. The non-destructive testing coverage rate is 100%, ensuring no internal defects in the pipe.

Chemical Analysis: Heat analysis to confirm chemical composition meets API 2B and ASTM A53 Gr.B requirements, strict control of harmful elements and non-metallic inclusions, ensuring product quality and corrosion resistance. The chemical composition is tested by a professional spectrometer to ensure accuracy.

Certification: Mill Test Report (MTR) provided for each order, with full heat number traceability; third-party inspection (SGS, BV) available on request to meet global oil field and industrial project acceptance standards. The product has passed relevant certifications and can be used in various domestic and foreign projects.

Packaging & Delivery

Packaging: 76mm steel pipes are bundled with high-strength steel strips (6-8 strips per bundle), wrapped with waterproof woven cloth to prevent rust and damage during transportation and on-site storage; high-strength plastic end caps are installed to protect pipe ends and internal surfaces, avoiding dust and moisture contamination. The packaging meets the requirements of long-distance transportation and on-site storage, ensuring the product is intact when delivered.

Marking: Each pipe is clearly marked with API 2B, ERW, 76mm (OD), steel grade, size (OD×WT), heat number, batch number, length, manufacturing date and "API 2B Steel Pipe" identification, facilitating on-site identification and management. The marking is clear and wear-resistant, ensuring long-term traceability.

Trade Terms: FOB, CIF, CFR, DAP, DDU all available, supporting various international trade cooperation methods for global oil field and industrial projects.

Shipping Ports: Major Chinese coastal ports (Tianjin, Qingdao, Shanghai, Ningbo), with professional loading equipment for 76mm steel pipes, ensuring efficient and convenient global transportation, supporting timely delivery for project schedules.

Customization: Accept customized wall thickness (3.5mm-12mm), lengths (matching project design), pipe ends (custom bevel angles/threaded ends), and anti-corrosion coating (HDG/FBE) to meet specific API 2B 76mm steel pipe project requirements. We can provide personalized solutions according to customer needs.

Contact Us

For quotation, stock availability, delivery lead time, and customized services ofAPI 2B ERW Steel Pipe 76mm, please contact our sales team. We have rich experience in supporting global oil field and industrial pipeline projects, providing API 2B/ASTM-standard 76mm ERW pipes, and professional technical support for on-site installation and fluid compatibility testing, ensuring the safe and stable operation of your pipeline systems.

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