Welded Steel Pipe Manufacturer - High-Quality Carbon & Stainless Steel Pipes

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

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Technical Specifications of Welded Steel Pipe

Property	Parameter	Description
Product Name	Welded Steel Pipe	Electric resistance welded (ERW) and LSAW/SSAW carbon steel pipe
Material Grade	ASTM A53 Gr.B / API 5L Gr.B / EN 10219 S235JRH	International grade equivalents
Manufacturing Process	ERW, LSAW, SSAW	High-frequency welding, longitudinal and spiral submerged arc welding
Standard Compliance	ASTM A53, ASTM A500, API 5L, EN 10219, EN 10217	Meets major international pipe standards
Carbon (C)	≤0.26%	Carbon content per ASTM A53 Gr.B
Manganese (Mn)	≤1.35%	Improves strength and hardenability
Phosphorus (P)	≤0.035%	Controlled for ductility and toughness
Sulfur (S)	≤0.035%	Low sulfur for improved weldability
Tensile Strength	≥415 MPa	Minimum tensile strength per ASTM A53 Gr.B
Yield Strength	≥240 MPa	Minimum yield strength
Elongation	≥22%	Ductility in 50mm gauge length
OD Range	21.3mm - 2540mm	ERW: 21.3-610mm; LSAW/SSAW: 219-2540mm
Wall Thickness	1.0mm - 40mm	Standard and custom wall thickness available
Length	5.8m - 12m or custom	Standard and random lengths
Surface Treatment	Black, galvanized, anti-corrosion coated, varnished	Multiple surface finish options
Application	Structural, water/gas transport, oil & gas pipeline, piling	Typical application industries
Certification	EN 10204 3.1, ISO 9001, API 5L, CE	Quality certifications provided by manufacturer
Packaging	Bundled with steel strips, plastic caps on ends	Standard export packaging
MOQ	5 tons	Minimum order quantity

Welded Steel Pipe Manufacturer - High-Quality Carbon & Stainless Steel Pipes

As a professional welded steel pipe manufacturer, we supply a comprehensive range of ERW (Electric Resistance Welded) and LSAW (Longitudinal Submerged Arc Welded) steel pipes engineered for structural, industrial, and energy infrastructure applications. Our production lines deliver carbon steel and stainless steel welded pipes conforming to ASTM A53, ASTM A500, EN 10219, and API 5L specifications, serving construction firms, pipeline contractors, and mechanical fabricators across global markets. With annual output capacity exceeding 200,000 metric tons, we provide factory-competitive pricing and reliable supply chain support for projects of every scale.

What Is Welded Steel Pipe?

Welded steel pipe is a tubular product formed by rolling steel strip or plate into a cylindrical shape and joining the seam through electric resistance welding, submerged arc welding, or high-frequency induction welding. Unlike seamless pipe produced by piercing solid billets, welded pipe offers cost-effective production in larger diameters and consistent wall thickness uniformity, making it the preferred choice for structural columns, water transmission, oil and gas gathering lines, and general mechanical applications.

Welded Steel Pipe Technical Specifications

Our welded steel pipes are manufactured according to the following standards and dimensional ranges:

Welded steel pipe manufacturer China

Parameter	ERW Pipe	LSAW Pipe
Outside Diameter	21.3 mm – 610 mm (1/2" – 24")	406 mm – 1422 mm (16" – 56")
Wall Thickness	1.0 mm – 20 mm	6.0 mm – 40 mm
Length	5.8 m, 6.0 m, 11.8 m, 12.0 m or custom	6.0 m – 18.0 m
Steel Grade	ASTM A53 Gr.B, API 5L Gr.B–X70, Q235B, Q345B	API 5L X42–X80, L245–L555
Yield Strength (Gr.B)	≥ 241 MPa per ASTM A53/A53M-22	≥ 245 MPa per API 5L 46th Ed.
Tensile Strength (Gr.B)	≥ 414 MPa	≥ 415 MPa
Surface Treatment	Black, galvanized, anti-corrosion coated (3LPE/FBE)	3LPE, 3LPP, FBE, bare

Why Choose Our Welded Steel Pipe Manufacturing Facility?

Integrated production: In-house steel strip slitting, forming, welding, heat treatment, and hydrostatic testing ensure full traceability from raw coil to finished pipe.
Rigorous quality control: Every welded pipe undergoes 100% ultrasonic testing (UT), eddy current inspection (ECT), and hydrostatic testing at 1.5× design pressure per ASTM A53 Section 10.
Certified operations: Our facility holds ISO 9001:2015, API 5L Monogram License, and CE marking (EN 10219-1:2006) certification.
Flexible processing: Beveling, threading, grooving, galvanizing, and custom coating services are available in-house to reduce your procurement complexity.

Frequently Asked Questions

What is the minimum order quantity (MOQ) for welded steel pipes?

Our standard MOQ is 5 metric tons per size and specification. For project-based orders requiring mixed dimensions, we accept combined shipments starting from 10 tons total.

Do you provide material test certificates?

Yes. Each shipment includes EN 10204 Type 3.1 Mill Test Certificates documenting chemical composition, mechanical properties, hydrostatic test results, and non-destructive examination records.

What is the typical delivery time?

Standard stock items ship within 7–10 business days. Custom-manufactured welded steel pipes with specific grades or coatings typically require 20–35 days depending on order volume and specification complexity.

Can you produce welded pipes in custom sizes and coatings?

Absolutely. We manufacture welded steel pipe to custom outside diameters, wall thicknesses, and lengths. Available coatings include hot-dip galvanizing (per ASTM A123), 3-layer polyethylene (3LPE per DIN 30670), and fusion bonded epoxy (FBE per CSA Z245.20).

Get a Competitive Quote for Welded Steel Pipe

Ready to source premium-grade welded steel pipes directly from the manufacturer? Contact our sales team today with your project specifications—including pipe size, steel grade, quantity, and required coating—and receive a detailed quotation within 24 hours. As an experienced welded steel pipe manufacturer, we deliver mill-direct rates, technical support, and on-time shipment to over 50 countries worldwide.

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Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Chris Martin

Canada

verified purchases

2025-01-28

Perfect LSAW Pipe Supply for Oil Sands Infrastructure
Sourced 95 tons of LSAW pipe in API 5L X70 PSL2, 914mm OD, 14.3mm wall with FBE internal and 3LPE external coating for an oil sands pipeline expansion in Alberta. The specification required low-temperature toughness testing at -46°C per CSA Z245.1, and the supplier confirmed capability before we committed. Charpy impact results at -46°C averaged 112 J — significantly above our 60 J requirement. Weld seam radiographic examination records were included in the documentation package alongside the EN 10204 3.1 certificates. Production completed in 33 days; pipe arrived at Edmonton laydown yard on day 37, within our project window. The mill-direct pricing saved our client approximately CAD 85,000 versus the domestic distributor quote we received. This is our first order with this manufacturer and it will not be the last.

Wei Chen

Singapore

verified purchases

2025-02-19

Acceptable Quality but Initial Certificate Discrepancy Needed Resolution
Placed an order for 25 tons of ERW pipe in API 5L Gr.B, 355mm OD, 9.5mm wall for a client's water transmission project in Indonesia. Pipe dimensions and mechanical properties were within specification when we verified against the mill certificates. However, the first set of 3.1 certificates issued had a clerical error in the heat number cross-referencing — our client's inspector flagged it before customs clearance. The supplier's quality team issued corrected documentation within two business days and the matter was resolved without shipment delay, as the error was administrative rather than a material nonconformity. The pipe itself passed our client's incoming inspection. We've flagged this for the supplier's document control process. Would consider reordering if the documentation QC improves.

William Taylor

Australia

verified purchases

2025-03-24

Reliable Galvanized ERW Pipe, Solid Technical Support
Ordered 22 tons of galvanized ERW pipe to ASTM A53 Gr.B, ranging from 2-inch to 6-inch OD, for marine jetty handrail and structural framing works in Darwin. Galvanizing coating weight averaged 610 g/m² per ASTM A123, which exceeded our project specification minimum of 550 g/m². Technical team responded to our pre-order specification queries within a few hours and confirmed compatibility with our design loads. Delivery took 14 days to Sydney warehouse, then onward freight to Darwin added time on our end. One pallet had minor transit damage to the pipe end caps, but the pipes themselves were undamaged. We sourced from three suppliers for this project; this order had the best documentation package of the three.

Carlos Silva

Brazil

verified purchases

2025-04-14

Superior ERW Stainless Pipe for Industrial Process Lines
Our second order with this manufacturer — 18 tons of ERW stainless steel pipe, 168mm OD, 4mm wall, in lengths of 6 metres for chemical process piping at our São Paulo plant. Surface finish on the weld seam interior was smooth and consistent, important for our fluid handling application. Hydrostatic test pressure records showed testing at 1.5× design pressure per ASTM A53 Section 10 with zero failures across the batch. We requested custom cut lengths of 5.5 metres on half the order and the factory accommodated without additional lead time. EN 10204 3.1 certificates arrived digitally within 48 hours of shipment. Pricing was 9% below the Brazilian import alternative we previously used. Reliable supply chain partner.

Ahmed Al-Hassan

UAE

verified purchases

2025-05-08

Excellent API 5L X65 LSAW Pipe for Subsea Pipeline
Procured 120 tons of LSAW pipe in API 5L X65 PSL2, 762mm OD, 19.05mm wall thickness with 3LPE coating per DIN 30670 for an offshore pipeline project in Abu Dhabi. This was a technically demanding specification — we required Charpy impact values at -20°C and full sour service documentation. All test reports were provided with the EN 10204 3.1 certificates, and impact values averaged 78 J, well above the 40 J minimum. Coating thickness uniformly measured between 3.2mm and 3.5mm. The API 5L Monogram on the pipe ends gave our client's engineer confidence during inspection. Delivery to Jebel Ali port completed in 32 days. Will be specifying this manufacturer for our upcoming 2026 pipeline tender.

Hans Mueller

Germany

verified purchases

2025-06-02

Good Value Welded Carbon Pipe, Minor Coating Delay
Purchased 30 tons of ERW pipe Q345B, 219mm OD, 8mm wall with hot-dip galvanizing per ASTM A123 for mechanical support structures at our Bavaria facility. Material quality was fully compliant — chemical composition and mechanical properties matched the mill certificates exactly. Our concern was a 4-day delay on the galvanizing step due to a coating line scheduling issue, which pushed final dispatch slightly. The sales team communicated the delay proactively and adjusted the freight booking accordingly, so our site schedule was not impacted. Price was competitive versus European stock suppliers. Would order again with a slightly earlier lead time buffer built in.

James Wilson

United Kingdom

verified purchases

2025-06-24

Premium LSAW Pipe Delivered Ahead of Schedule
We sourced 80 tons of LSAW pipe to EN 10219 S355J2H, 508mm OD, 12.7mm wall, in 12-metre lengths for a structural column application on a commercial development in Manchester. The dimensional tolerances were tight — wall thickness variation measured within ±0.3mm across the batch, which our welding team appreciated. 3LPE coating adhesion tested at over 15 N/mm per DIN 30670 requirements. Production and dispatch were completed in 28 days against a quoted 30-day lead time. CE marking documentation and the full EN 10204 3.1 certificate pack were emailed before shipment. Third order with this supplier and consistency has been solid throughout.

Michael Johnson

United States

verified purchases

2025-07-09

Outstanding ERW Pipe Quality for Gas Gathering Project
Ordered 45 tons of ERW pipe in API 5L Gr.B, 8-inch OD, 6.35mm wall thickness with FBE coating for a natural gas gathering line in West Texas. Mill test certificates showed yield strength at 268 MPa and tensile at 432 MPa, both well above ASTM A53 minimums. UT and hydrostatic test records were included in the EN 10204 3.1 documentation package — no issues flagged by our third-party inspector. Beveled ends were clean and within tolerance. Shipment arrived at Houston port in 18 days. We compared quotes from 6 suppliers; this facility came in 7% below domestic mill pricing. Already planning our next order for the Q4 expansion phase.