Welded Steel Pipe Supplier - 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	Carbon steel pipe produced by welding process
Material Grade	ASTM A53 Gr.B / API 5L Gr.B / EN 10219 S235JRH	International grade equivalents
Manufacturing Process	ERW, LSAW, SSAW	Electric Resistance Welded, Longitudinal & Spiral Submerged Arc Welded
Standard Compliance	ASTM A53, ASTM A500, API 5L, EN 10219, BS 1387	Meets major international standards
Carbon (C)	≤0.26%	Carbon content per ASTM A53 Gr.B
Manganese (Mn)	≤1.20%	Improves strength and hardenability
Phosphorus (P)	≤0.035%	Controlled for ductility
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	Available outer diameter options across ERW/LSAW/SSAW
Wall Thickness	0.8mm - 40mm	Standard and custom thickness available
Length	5.8m - 12m or custom	Standard and custom lengths
Surface Treatment	Black, Galvanized, Anti-corrosion Coated, Varnished	Multiple surface treatment options
Application	Construction, Water Transport, Oil & Gas, Structural Support	Typical application industries
Certification	EN 10204 3.1, ISO 9001, API 5L, CE	Quality certifications provided
Packaging	Bundled with steel strips, plastic caps on ends	Standard export packaging
MOQ	5 tons	Minimum order quantity

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

As a professional welded steel pipe supplier, we deliver ERW, LSAW, and SSAW pipes manufactured from carbon steel and stainless steel grades to serve infrastructure, energy, and industrial construction sectors worldwide. Our production lines operate in strict compliance with ASTM A53, API 5L, and EN 10219 standards, ensuring every pipe meets rigorous dimensional tolerances and mechanical property requirements. Whether you need structural tubing for building frameworks or line pipe for fluid transmission, our mill-direct supply chain provides factory-competitive pricing with full traceability documentation.

Welded steel pipe manufacturer

What Is Welded Steel Pipe?

Welded steel pipe is a tubular product formed by rolling steel plate or strip into a cylindrical shape and joining the edges through electric resistance welding (ERW), submerged arc welding (SAW), or spiral welding processes. Unlike seamless pipe, welded pipe offers cost-effective production for larger diameters and consistent wall thickness, making it the preferred choice for structural, mechanical, and fluid conveyance applications.

Welded steel pipe wholesale

Welded Steel Pipe Technical Specifications

Our welded pipe range covers outside diameters from 21.3 mm to 2540 mm, with wall thicknesses from 1.0 mm to 40 mm. Key material grades include:

Standard	Grade	Yield Strength (Min)	Tensile Strength (Min)
ASTM A53/A53M	Grade B	240 MPa	415 MPa
API 5L PSL1	X42–X70	290–485 MPa	415–565 MPa
EN 10219-1	S235JRH–S355J2H	235–355 MPa	360–510 MPa
ASTM A312	TP304/TP316L	170–205 MPa	485–515 MPa

All pipes undergo hydrostatic testing per ASTM A530/A530M and non-destructive examination (NDE) including ultrasonic testing to verify weld seam integrity at 100% inspection rate.

Why Choose Us as Your Welded Steel Pipe Supplier

Comprehensive inventory: Over 15,000 metric tons of welded steel pipe readily accessible in carbon, stainless, and alloy grades across ERW, LSAW, and SSAW types.
Certified quality system: ISO 9001:2015 certified facility with mill test certificates (MTC) issued per EN 10204 Type 3.1 for every shipment.
Value-added processing: In-house cutting, beveling, coating (3LPE/3LPP/FBE), and galvanizing services reduce your procurement complexity.
Global logistics experience: Established export operations to over 40 countries with flexible packaging — bundle, bulk, or containerized loading.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ for welded steel pipe is 5 metric tons per size and grade. Mixed container orders combining multiple specifications are available upon request.

Do you provide material test certificates?

Yes. Every order ships with original mill test certificates conforming to EN 10204 Type 3.1, covering chemical composition, mechanical properties, and NDE results.

Welded steel pipe China

What is the typical delivery time?

Stock items ship within 5–7 business days. Custom-produced welded pipe orders, including special lengths or coatings, typically require 15–25 working days depending on quantity and specification.

Can you cut to custom sizes?

Absolutely. We offer precision cutting to fixed lengths ranging from 0.5 m to 18 m, along with beveling at 30° or 37.5° per ASME B16.25 for field welding readiness.

Get a Competitive Quote for Welded Steel Pipe

Ready to source welded steel pipe from a reliable supplier with mill-direct pricing? Contact our sales team today with your required specifications — including grade, diameter, wall thickness, and quantity — and receive a detailed quotation within 24 hours. We look forward to supporting your next project with dependable products and responsive service.

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

Robert Brown

United Kingdom

verified purchases

2025-09-17

Acceptable EN 10219 S235JRH ERW Tubes — Delivery Delay Resolved
Ordered 12 tons of EN 10219 S235JRH ERW circular hollow sections, OD 101.6mm, wall thickness 4mm, cut to 3m lengths for a light structural application. Material quality itself was fine — MTC showed mechanical properties within standard and dimensional checks on 20 sampled pieces passed our incoming inspection. The issue was delivery: stock items were quoted at 5–7 business days but actual dispatch took 11 business days due to a loading schedule conflict at the warehouse. After raising this with the sales team, they arranged expedited freight at no extra cost and provided a formal explanation. The pipe arrived in good condition with no handling damage. Quality of product is acceptable; the logistics coordination needs improvement for time-sensitive orders.

Wei Chen

Singapore

verified purchases

2025-10-05

Excellent API 5L X60 Line Pipe Supply for Regional Distribution
Acting as a trading intermediary, we placed a 350-ton order of API 5L PSL2 X60 LSAW line pipe, OD 762mm, wall thickness 9.5mm, for an end client in Southeast Asia. Full traceability documentation was critical for our client's project engineer — heat numbers, pipe numbers, and MTC data were provided in both hard copy and digital format. NDE results including ultrasonic and hydrostatic test records were complete for every pipe. The supplier accommodated a split shipment across two vessels to meet our client's site storage constraints. Response time from our RFQ to formal quotation was under 20 hours. This level of documentation control and logistics flexibility is why we continue to use this supplier for regional projects.

Carlos Silva

Brazil

verified purchases

2025-10-27

Reliable ASTM A53 Grade B ERW Carbon Steel Pipes for Industrial Piping
Sourced 25 tons of ASTM A53 Grade B ERW pipe in mixed sizes — OD 60.3mm to 114.3mm, wall thickness 3.91mm to 6.02mm — for a factory expansion project in São Paulo. Mixed container order combining 4 specifications was handled without issues, which not all suppliers accommodate at this MOQ level. MTC documentation was complete and chemical composition results were within standard limits. Delivery to Santos port took 24 working days, slightly longer than the 15–25 day range due to a public holiday period, but we were informed proactively. Pricing was 11% below our previous supplier for equivalent ASTM A53 material. Will evaluate for future orders based on this experience.

William Taylor

Australia

verified purchases

2025-11-18

Premium ASTM A53 Grade B ERW Pipes for Offshore Support Structure
Ordered 30 tons of ASTM A53 Grade B ERW pipe, OD 219.1mm, wall thickness 8.18mm, for jacket support structures on a platform project off the Western Australian coast. Yield strength on the MTC came in at 278 MPa against the 240 MPa minimum — good headroom for our structural calculations. We requested ultrasonic weld seam inspection reports separately and they were provided without additional charge. Galvanizing service was also used for 8 tons of smaller diameter sections — coating thickness averaged 92 microns per AS/NZS 4680. This is our second order with this supplier. Pricing is competitive versus local distributors, and the 3.1 certificates are accepted directly by our certifying authority.

Ahmed Al-Hassan

UAE

verified purchases

2025-12-11

Superior API 5L X52 SSAW Pipes for Water Transmission
Placed an order for 200 tons of API 5L PSL1 X52 SSAW pipes, OD 1016mm, wall thickness 10mm, with FBE internal coating for a municipal water supply pipeline in Abu Dhabi. Hydrostatic test certificates were provided per ASTM A530, with test pressure records for each pipe length. The FBE coating thickness averaged 420 microns across sample checks, meeting our project specification of 400 microns minimum. Containerized loading was well-organized — no pipe end damage on arrival. Lead time was 22 working days for this custom-produced order. Documentation package including packing list, MTC, and coating inspection report was complete and accepted by our client engineer without revision requests.

Hans Mueller

Germany

verified purchases

2025-12-27

Good Value ASTM A312 TP316L Welded Pipe for Chemical Plant
Purchased 18 tons of ASTM A312 TP316L stainless steel welded pipe, OD 168.3mm, wall thickness 6mm, for a chemical processing facility in Cologne. Chemical composition on the MTC showed carbon at 0.018% — well within the 0.03% max for L-grade. Price was approximately 8% lower than our previous European supplier for comparable specification. Minor point: one bundle had slight surface scratching on the outer diameter, likely from handling during transit. Supplier responded within 4 hours and provided a partial credit without dispute. Overall quality meets our process requirements and we would consider ordering again for future projects.

James Wilson

United Kingdom

verified purchases

2026-01-02

Excellent EN 10219 S355J2H ERW Tubes for Steel Frame Construction
Sourced 45 tons of EN 10219-1 S355J2H ERW structural hollow sections, 200x200mm square profile, 8mm wall thickness, for a commercial building framework project in Manchester. EN 10204 Type 3.1 mill test certificates showed tensile strength at 498 MPa, comfortably within the 470–630 MPa range. Dimensional tolerances were tight — we spot-checked 30 pieces and all were within ±0.5mm on wall thickness. Cut-to-length service at 6m fixed lengths saved us significant workshop time. Delivery took 7 business days from stock, exactly as quoted. Will be placing another order for Phase 2 of this development.

Michael Johnson

United States

verified purchases

2026-01-17

Outstanding API 5L X65 LSAW Pipes for Pipeline Project
Ordered 120 tons of API 5L X65 LSAW pipes, OD 508mm, wall thickness 12.7mm, with 3LPE coating for a natural gas transmission project in Texas. Mill test certificates confirmed yield strength at 462 MPa, well above the 448 MPa minimum. Weld seam ultrasonic testing results were included in the documentation package — 100% inspection rate as advertised. Beveling at 30° per ASME B16.25 was clean and consistent across all pieces. Shipment arrived at Houston port in 19 working days, within the quoted 15–25 day window. We compared quotes from 6 suppliers before choosing this mill. Third order with them and quality has been consistent throughout.