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Product introduction
Product Description
API 5L ERW Steel Pipe For Oil Projects is a high-performance electric resistance welded steel pipe manufactured strictly in accordance with API 5L standard (PSL 1/PSL 2), specially developed foroil exploration, oilfield development, crude oil transmission, refinery process, and offshore oil pipeline projects. Adopting high-quality API 5L grade steel coils and advanced high-frequency electric resistance welding (ERW) technology, this pipe features excellent pressure-bearing capacity, stable weld integrity, precise dimensional accuracy, and strong corrosion resistance to crude oil, oilfield brine, and harsh oilfield environments. Designed for long-term service under high-pressure, high-temperature, and corrosive oil project conditions, it is widely used in onshore oilfields, offshore oil platforms, crude oil long-distance transmission pipelines, and refinery internal process pipelines worldwide, providing safe, efficient, and standard-compliant pipeline solutions for global oil and gas industry projects[1][4][5].
Basic Product Specifications
Product Name: API 5L ERW Steel Pipe For Oil Projects
Executive Standard: API 5L (PSL 1/PSL 2), compatible with GB/T 9711, ISO 3183, GB/T 3091, and AWWA C200 (for oilfield supporting projects)
Manufacturing Process: ERW (Electric Resistance Welding), high-frequency induction welding, steel coil uncoiling & slitting, precision cold forming, weld normalization, internal/external weld bead trimming, stress-relieved heat treatment, hydrostatic testing, and anti-corrosion finishing[2][3]
Steel Grade: API 5L Gr.B, X42, X52, X60 (core grades for oil projects); X65, X70 optional for high-pressure oil transmission and offshore oil projects[4]
Outer Diameter (OD): 21.3mm – 660mm (0.84inch – 26inch), mainstream specifications (88.9mm – 508mm) for oilfield and crude oil transmission[1][4]
Wall Thickness (WT): 2.11mm – 30.18mm, custom thick-wall up to 35mm for high-pressure offshore oil pipelines and heavy-load oilfield applications[4]
Standard Length: 8m – 12.5m (standard for oil project construction), 6m/9m optional, custom fixed lengths up to 14m available[1][4]
Delivery Condition: Normalized + stress-relieved (standard for oil projects), ensuring weld toughness and resistance to stress corrosion cracking; low-temperature tempering optional for cold-region oilfields[3]
Surface Finish: Black bare steel with anti-rust oil (for indoor storage); 3PE/FBE anti-corrosion coating (for buried/offshore oil pipelines); epoxy resin inner coating (for crude oil transmission to prevent scaling and corrosion)[3][5]
Pipe End: 30°–45° beveled ends (for on-site welding, standard for oil pipelines); plain ends/flanged ends optional (for refinery process pipeline connections)
Application: Onshore oilfield exploitation pipelines, offshore oil platform auxiliary pipelines, crude oil long-distance transmission pipelines, refinery internal process pipelines, oilfield brine discharge pipelines, oil storage tank connecting pipelines, and oil well casing pipe blanks[1][5]
Grade & Process Explanation
API 5L Grade Performance for Oil Projects: API 5L grades (Gr.B to X70) are specially formulated for oil and gas transmission, with strict control of chemical composition and mechanical properties to adapt to the harsh conditions of oil projects. API 5L Gr.B (minimum yield strength ≥245MPa) is suitable for conventional low-to-medium pressure oilfield pipelines and refinery auxiliary pipelines. X42-X52 grades (yield strength ≥290MPa-360MPa) are ideal for medium-high pressure crude oil transmission pipelines. X60-X70 grades (yield strength ≥415MPa-485MPa) feature high strength, excellent impact toughness, and corrosion resistance, suitable for high-pressure offshore oil pipelines and cold-region oilfield projects[4]. All grades adopt low-sulfur (≤0.030% for PSL1, ≤0.015% for PSL2) and low-phosphorus (≤0.030% for PSL1, ≤0.025% for PSL2) composition, effectively resisting corrosion from crude oil, oilfield brine, and hydrogen sulfide (H₂S), avoiding stress corrosion cracking and fatigue damage in long-term oil service[3][4].
ERW Process Advantages for Oil Pipes: High-frequency ERW welding technology heats the steel coil edges through high-frequency induction, forging them together under pressure without the need for filler metal, ensuring dense weld seams and high weld strength[2]. The post-weld normalization and stress-relieved heat treatment (920-950℃ heating, 5-15 minutes insulation) eliminate residual stress, refine weld grain structure, and ensure weld mechanical properties are consistent with the base metal, which is critical for oil pipelines to withstand high pressure and frequent pressure fluctuations[3]. ERW process features high production efficiency, precise dimensional control, and stable quality, making it suitable for large-scale oil pipeline construction, and its cost competitiveness is significantly higher than seamless pipes while maintaining equivalent performance[1][2].
Oil Project-Oriented Special Design: Optimized for the core needs of oil projects, including high-pressure bearing, corrosion resistance, and easy on-site installation. Strict dimensional tolerance ensures reliable connection with oil pipeline fittings (flanges, valves, couplings), reducing on-site construction errors. Professional anti-corrosion coating systems (3PE/FBE) isolate soil, seawater, and crude oil, extending the service life of the pipeline to over 30 years in harsh oilfield environments[3][5]. The pipe body is designed with excellent anti-extrusion and anti-explosion performance, adapting to the complex terrain of onshore oilfields and the high-pressure, corrosive environment of offshore oil platforms[1].
Dimensional Tolerance (API 5L Standard, PSL 1/PSL 2)
|
Item |
PSL 1 Tolerance |
PSL 2 Tolerance (More Stringent) |
|
Outer Diameter |
±0.75% of nominal OD |
±0.5% of nominal OD |
|
Wall Thickness |
≤12.5% under nominal WT |
≤10% under nominal WT |
|
Out-of-Roundness |
≤1.0% of outer diameter |
≤0.8% of outer diameter |
|
Straightness |
≤2.0 mm per meter |
≤1.5 mm per meter |
|
Length |
+200 mm / −0 mm |
+150 mm / −0 mm |
Mechanical Properties (API 5L Reference, PSL 1/PSL 2)
|
Property |
Gr.B |
X42 |
X52 |
X60 |
|
Minimum Yield Strength |
≥245 MPa |
≥290 MPa |
≥360 MPa |
≥415 MPa |
|
Tensile Strength |
415–655 MPa |
≥415 MPa |
≥460 MPa |
≥520 MPa |
|
Elongation |
≥21% |
≥21% |
≥21% |
≥20% |
|
Hydrostatic Test |
100% tested at 1.5× working pressure (minimum 3.0MPa), holding time ≥30 minutes, no leakage or permanent deformation[3] |
|||
|
Charpy Impact (PSL 2) |
≥27 J at 0℃; optional ≥34 J at -20℃ for cold-region oil projects[3][4] |
|||
|
Flattening / Bend Test |
No cracks, weld separation or structural defects; flattening to 2/3 of outer diameter, bend test without fracture[3] |
|||
Note: For offshore oil projects and H₂S-containing oilfield pipelines, additional sulfide stress corrosion cracking (SSCC) test and TOFD diffractiondetection are optional to ensure pipeline safety in corrosive and high-pressure environments[3].
Chemical Composition (Max. %, API 5L PSL 1/PSL 2)
|
Element |
C |
Mn |
P |
S |
Si |
|
PSL 1 (All Grades) |
≤0.28 |
≤1.40 |
≤0.030 |
≤0.030 |
≤0.45 |
|
PSL 2 (All Grades) |
≤0.24 |
≤1.45 |
≤0.025 |
≤0.015 |
≤0.45 |
Residual elements: Cu ≤0.50%, Ni ≤0.30%, Cr ≤0.30%, Mo ≤0.15% (max. %). Strict control of impurities and non-metallic inclusions prevents rust, scaling, and stress corrosion cracking in crude oil and oilfield brine environments, ensuring the long-term stability and safety of oil pipelines[3][4]. The steel coils are subjected to strict surface derusting, cleaning, and edge trimming before forming and welding, further improving weld quality and corrosion resistance[2].
Manufacturing Process (ERW for Oil Projects)
Raw Material Inspection: Select high-quality API 5L grade steel coils (Gr.B/X42/X52/X60) that comply with API 5L PSL 1/PSL 2 standards, and strictly inspect the chemical composition, mechanical properties, and surface quality before production. The steel coils undergo derusting, oil removal, and cleaning to eliminate surface impurities, ensuring weld quality and structural stability of the pipe body[2][3].
Steel Coil Uncoiling & Slitting: Uncoil the steel coil and slit it to the precise width matching the required pipe diameter, ensuring the width uniformity and edge flatness, laying a foundation for subsequent forming and welding[2].
Precision Cold Forming: The slit steel strip passes through a series of forming rolls, gradually bending from a flat strip into an open circular section, ensuring uniform wall thickness, high roundness, and consistent dimensional accuracy of the pipe body[2].
High-Frequency ERW Welding: Use high-frequency induction heating to heat the edges of the formed steel strip to the welding temperature, then forge the edges together under pressure to form a continuous, full-penetration weld without filler metal. The welding process is controlled by an intelligent system to ensure uniform weld formation and stable quality[2][3].
Weld Bead Trimming & Normalization: Trim the internal and external weld beads to ensure the inner and outer surfaces of the pipe are smooth, avoiding medium deposition during crude oil transmission. Perform weld normalization treatment to refine the weld grain structure and improve weld toughness[2][3].
Stress-Relieved Heat Treatment: Perform stress-relieved heat treatment on the welded pipe to eliminate residual stress, improve the anti-fatigue performance and stress corrosion resistance of the pipe body, and avoid cracking during oil pipeline installation and service[3].
NDT Inspection: 100% online ultrasonic testing (UT) of weld seams to detect internal defects; X-ray testing (RT) optional for high-safety oil projects (such as offshore oil pipelines); visual inspection of weld surface to ensure no pores, cracks, or incomplete fusion[3][4].
Hydrostatic Test: 100% pressure test is carried out at ≥1.5 times the working pressure, with a holding time of 30-60 minutes according to API 5L standard, ensuring no leakage or permanent deformation-critical for the safety and reliability of oil pipelines[3].
Anti-Corrosion Treatment (Optional): For buried, offshore, or H₂S-containing oil environments, apply 3PE/FBE anti-corrosion coating (external) and epoxy resin coating (internal) to isolate corrosive media, extend the pipeline service life, and meet the anti-corrosion requirements of oil projects[3][5].
Finishing: Cut the pipes to standard lengths, process pipe ends (beveled/plain/flanged), apply anti-rust oil to the surface, and carry out clear marking to complete the production process[2].
Product Advantages
API 5L PSL 1/PSL 2 Standard Compliance: Fully meets the international standard for oil and gas transmission pipes, accepted by global oil project owners, refineries, and third-party inspectors, ensuring smooth project acceptance[4][5].
Excellent High-Pressure Bearing Capacity: Optimized ERW process + high-strength API 5L grades, capable of withstanding high pressure and frequent pressure fluctuations in crude oil transmission and oilfield exploitation, avoiding pipeline leakage[3][4].
Superior Corrosion Resistance: Low-sulfur low-phosphorus composition + professional anti-corrosion coatings, resisting corrosion from crude oil, oilfield brine, seawater, and H₂S, adapting to harsh oilfield and offshore environments[3][5].
Stable ERW Weld Quality: High-frequency induction welding + post-weld normalization, dense weld seams, low defect rate, weld mechanical properties consistent with the base metal, ensuring long-term service stability in oil projects[2][3].
High Precision & Easy Installation: Strict dimensional tolerance control ensures perfect connection with oil pipeline fittings, reducing on-site construction time and cost; standard beveled ends facilitate on-site welding[4].
Cost-Effective & Efficient Production: ERW process has high production efficiency, suitable for large-batch production, low manufacturing cost; compared with seamless pipes, it has obvious cost advantages while maintaining equivalent performance for oil projects[1][2].
Complete Quality Traceability: Full heat number tracking, API-standard Mill Test Report (MTR) provided for each order; SGS/BV/CCS third-party inspection available to meet the strict quality requirements of oil projects[4].
Wide Specification Coverage: Outer diameter from 21.3mm to 660mm, wall thickness from 2.11mm to 35mm, covering all mainstream specifications for onshore/offshore oil projects, supporting custom requirements[1][4].
Main Applications
Onshore oilfield exploitation and oil well connecting pipelines
Offshore oil platform auxiliary pipelines and seabed crude oil transmission pipelines[5]
Crude oil long-distance transmission trunk pipelines[1][5]
Refinery internal process pipelines (crude oil, gasoline, diesel transmission)[5]
Oilfield brine discharge and treatment pipelines
Oil storage tank connecting pipelines and oil loading/unloading pipelines
Cold-region and desert oilfield pipelines (with low-temperature impact resistance)
H₂S-containing oilfield pipelines (with anti-stress corrosion treatment)
Oil well casing pipe blanks for oilfield development[1]
Quality Inspection & Certification
Dimensional Inspection: Full inspection of outer diameter, wall thickness, length, straightness, and out-of-roundness to meet API 5L PSL 1/PSL 2 standards, ensuring compatibility with oil pipeline fittings and on-site installation requirements[4].
Mechanical Property Testing: Tensile test, bend test, flattening test, hydrostatic test, and mandatory Charpy impact test (for PSL 2); optional SSCC test and fatigue test for offshore and high-pressure oil projects[3][4].
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) for weld seams; X-ray Testing (RT) and TOFD detection optional for high-safety oil projects; visual inspection of pipe body and weld surface[3].
Chemical Analysis: Heat-batch chemical composition analysis per API 5L PSL 1/PSL 2, strict control of harmful elements and non-metallic inclusions, ensuring the corrosion resistance and mechanical properties of the pipe[4].
Certification: API 5L standard Mill Test Report (MTR) provided for each order, with full heat number traceability; third-party inspection (SGS, BV, CCS) available on request to meet global oil project acceptance standards[4].
Packaging & Delivery
Packaging: Pipes are bundled with heavy-duty steel strips (6-10 strips per bundle), wrapped with waterproof and oil-proof woven cloth to prevent rust, oil pollution, and damage during transportation and on-site storage; high-strength plastic or steel end caps are installed to protect pipe ends and internal surfaces, avoiding dust and moisture contamination (critical for crude oil transmission cleanliness).
Marking: Each pipe is clearly marked with API 5L, ERW, PSL 1/PSL 2, steel grade, outer diameter×wall thickness, heat number, batch number, length, manufacturing date, and "Oil Pipeline Steel Pipe" identification, facilitating on-site identification and management, complying with the marking requirements of API 5L[4].
Trade Terms: FOB, CIF, CFR, DAP, DDU all available, supporting various international trade cooperation methods for global oil projects[5].
Shipping Ports: Major Chinese coastal ports (Tianjin, Qingdao, Shanghai, Ningbo), with professional loading equipment for oil pipeline steel pipes, ensuring efficient and convenient global transportation, supporting timely delivery for oil project schedules.
Customization: Accept customized wall thickness (2.11mm-35mm), anti-corrosion coating (3PE/FBE/epoxy resin), lengths (matching oil project construction design), and pipe ends (beveled/plain/flanged) to meet specific oil pipeline project requirements.
Contact Us
For quotation, stock availability, delivery lead time, and customized technical solutions of API 5L ERW Steel Pipe For Oil Projects, please contact our sales team. We have rich experience in supporting onshore/offshore oil projects, refinery projects, and crude oil transmission projects, providing API 5L PSL 1/PSL 2 compliant ERW oil pipes, and professional technical support for on-site installation, pressure testing, and anti-corrosion treatment, ensuring the safe, stable, and efficient operation of your oil pipeline systems.
About us
Hebei Huayang Steel Pipe Co., Ltd. was founded in 2005, with a registered capital of 500 million yuan. The company covers an area of more than 1,000 mu, with annual sales of 10 billion yuan, more than 600 employees and an annual productivity of 2.75 million tons. The company has 17 new automatic steel pipe production lines and 14 high-frequency production lines, with a diameter of 73-660 mm; Three double-sided submerged arc welded steel pipe production lines with diameters of 406.4-1422.4mm;; 24 hot tube expanding production lines, with a diameter of 230-820mm; Two anticorrosion steel pipe production lines with a diameter of 73-1626 mm; 2 automatic painting production lines. With 3 branches and 5 offices, the products are sold to various cities and exported to more than 80 countries such as Southeast Asia, Middle East, Europe and America.
Packaging, transportation and delivery
Packaging, transportation and delivery
At Hebei Huayang Steel Pipe Co., Ltd., we apply standardized and reliable packaging solutions for all our steel pipe products. Our pipes can be securely packed by hexagonal bundling or circular bundling according to product diameter, wall thickness and customer requirements. Each pipe end is protected with high‑strength plastic pipe caps to avoid collision damage, dust and moisture during transportation and storage. The whole bundle is firmly wrapped with durable woven bags to enhance stability and prevent scratches or deformation.
We support a complete range of transportation methods to satisfy global customers, including road transportation, railway transportation, sea freight and container shipping. Based on our strategic location in Cangzhou, Hebei Province, we enjoy convenient access to major ports such as Tianjin Port, which greatly improves logistics efficiency and reduces transportation costs.
For standard specifications and normal order quantities, the general delivery time is about 30 days after order confirmation and deposit receipt. For large‑scale orders, special sizes or customized processing requirements, our production and sales team will formulate a detailed production plan and provide an accurate delivery schedule accordingly to ensure on‑time supply and stable performance for projects and clients worldwide.
Strict quality control
1. During and after the production, experienced quality inspectors randomly check the products to ensure that each steel pipe is qualified for production and application.
2. A nationally recognized laboratory with CNAS certification and certification by French Classification Society.
3. Have CNOOC access certificate, KOC oil company access network, ADNOC Abu Dhabi oil company access network, Petrobras access network, etc.
4. Accept the inspection by the third party designated/paid by the buyer, such as SGS and BV.
Certifications
API 2B
API 5L
GOST
ISO 9001
EN 10219
EN 10210
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