Our high-quality ERW (Electric Resistance Welded) steel pipes are crafted via advanced high-frequency welding (HFW) or contact welding technology, shaping cold-rolled steel strips into precise cylindrical or custom profiles. With excellent weld integrity, dimensional accuracy, and smooth surface finish, these pipes are widely used in energy transmission, structural construction, mechanical systems, fluid conveyance, and low-pressure pressure piping. Offering superior weldability, formability, and mechanical performance, our ERW pipes provide a cost-effective and efficient alternative to seamless and standard welded pipes-ideal for large-scale, standardized engineering projects.
Key Features
Standards:
International:
API 5L (Line Pipe Specification): Grades A25, A, B, X42–X80, for oil, gas, and water transmission.
ISO 3183 (Equivalent to API 5L)
ASTM A53 (Black and galvanized welded steel pipe for mechanical/structural use)
ASTM A139 (Large-diameter electric-fusion-welded steel pipe)
EN 10217-1/-2 (Welded steel tubes for pressure purposes)
Chinese:
GB/T 9711 (Equivalent to API 5L)
GB/T 3091 (Welded steel pipes for low-pressure fluid transport)
GB/T 6728 (Cold-formed structural hollow sections)
Custom: Available per customer specification, MDS, or drawing.
Materials:
Carbon Structural Steels:
Q195, Q215, Q235 (GB/T 3091)
L245, L290, L360, L415, L450, L485, L555 (API 5L / GB/T 9711)
S235, S355 (EN 10025, for export projects)
Special Grades:
Weathering Steel: Q355NH
Sour Service: L360QS, L415QS (NACE MR0175/ISO 15156 compliant)
Steel strips sourced from top-tier mills (e.g., Baosteel, Ansteel, Shougang) with stable chemistry and excellent weldability.
Dimensions:
OD:
Round: 21.3 mm (1/2") – 660 mm (26")
WT: 1.0 – 25 mm
Length: Fixed (6m, 12m), multiple, up to 13.5m
Tolerances (API 5L / GB/T 9711):
OD: ±0.75%D or ±0.5mm
WT: +15% / -12.5%
Straightness: ≤0.2% of length
Applications:
Energy: Onshore/offshore oil/gas gathering lines, city gas networks, water pipelines;
Construction: Columns, trusses, curtain walls, scaffolding;
Mechanical: Hydraulic cylinders, shaft sleeves, equipment frames;
Fluid Systems: Low-pressure steam, air, cooling water;
Power & Telecom: Conduits, tower components, PV mounts;
Agriculture & Light Industry: Greenhouses, conveyors, racks.
Certifications:
Classification Society Approvals:
For marine and offshore applications:
CCS, ABS, DNV, BV, LR material and factory approval
MTC (Type 3.1/3.2) with class stamp, third-party inspection supported
End-User & Engineering Company Qualifications:
Approved by:
Owners: CNPC, CNOOC, Sinopec, PipeChina, China Energy, China Resources Gas
EPCs: CPECC, COOEC, CEEC, TechnipFMC, Saipem
International Projects: Supplied to pipeline projects in Central Asia, Middle East, Southeast Asia.
Quality & System Certifications:
API 5L Monogram License
ISO 9001:2015, ISO 14001:2015, ISO 45001:2018
PED 2010/35/EU (CE Marking)
NACE MR0175 / ISO 15156 Compliance
Common Customer Questions (Q&A Format)
Q: Do your ERW pipes comply with API 5L? Do you have the API Monogram?
A: Yes, we hold API 5L Monogram certification. All line pipes are manufactured to API 5L, with API marks stamped on each pipe for global traceability.
Q: Can you supply high-grade pipes like X60, X65, or L450?
A: Yes. We routinely supply grades from X42 to X70 (L360 to L485) for onshore and offshore oil & gas projects.
Q: What is your maximum ERW pipe size? Suitable for large-diameter water pipelines?
A: Max OD: 660mm (26"), WT: 25mm-ideal for large-diameter water, gas, and industrial pipelines.
Q: Do you offer H₂S-resistant ERW pipes, such as L360QS or L415QS?
A: Yes. We supply NACE-compliant grades (e.g., L360QS, L415QS) for sour service environments.
Q: Are you approved by SHELL, KOC, PETROBRASS ,CNPC, CNOOC, or Other Oil, Gas, EPC company ?
A: Yes. We have passed technical audits by Shell, Koc, Petrobrass, Petronas,CNPC, CNOOC, PipeChina, and other major energy companies.
Q: What is the typical lead time? Do you have stock for common sizes?
A: Lead time: 30–50 days. Common sizes (e.g., DN80–DN200, Grade B, X42) are in stock for fast delivery.
Q: Do you provide full quality documentation, such as MTC and NDT reports?
A: Yes. Each batch includes MTC (Type 3.1/3.2), chemical analysis, tensile, impact, bend, flattening tests, and UT/ET weld inspection reports.
Q: Can you manufacture per customer SPEC or MDS?
A: Yes. We fully support custom production per technical agreement, MDS, drawing, or SPEC, including special grades, tolerances, coatings (FBE, epoxy), and 3PE corrosion protection.
Q: Are your pipes suitable for offshore platforms or shipbuilding? Can you support class society inspection?
A: Yes. Widely used in marine projects. We support inspections by CCS, ABS, DNV, etc., and provide compliance documentation.
Q: What is your export packaging? Does it meet international shipping standards?
A: Packaged with rust preventive oil, plastic end caps, steel strapping, marine protection frames, clearly labeled (grade, heat no., size, standard), compliant with API RP 5L1 and international shipping requirements.
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