Welded Steel Tube - High-Strength Carbon Steel Tubing for Structural Applications

Kuaima Steel Co., Ltd.

Verified Custom manufacturer · 7 yrs ·

China

Customizable Rock-bottom price

$655 1-49 ton Base price

$625 50-99 ton 4.6% off

$610 ≥100 ton 6.9% off

Price validity: subject to market conditions

Supplier's customization ability

Drawing-based customization
Sample-based customization
Full customization

Quantity

Minimum order quantity: 1 ton

Shipping total: To be negotiated

Subtotal of goods US$ 655.00

Start order request

Payment and delivery

Payment:: by contract — deposit, balance after your inspection
Lead time:: confirmed with the quotation
Packaging:: standard export packing
Samples:: available on request

Product details

Technical Specifications of Welded Steel Tube

Property	Parameter	Description
Product Name	Welded Steel Tube	Electric resistance welded (ERW) carbon steel tube
Material Grade	ASTM A500 Gr. B / EN 10219 S235JRH / Q235B	International grade equivalents
Manufacturing Process	ERW / HFW / LSAW / SSAW	Multiple welding processes available
Standard Compliance	ASTM A500, ASTM A513, EN 10219, EN 10210	Meets major international standards
Carbon (C)	≤0.26%	Carbon content for formability and strength
Manganese (Mn)	≤1.40%	Improves strength and hardenability
Phosphorus (P)	≤0.040%	Controlled for ductility
Sulfur (S)	≤0.050%	Low sulfur for weld integrity
Tensile Strength	≥400 MPa	Minimum tensile strength per ASTM A500 Gr. B
Yield Strength	≥290 MPa	Minimum yield strength
Elongation	≥23%	Ductility in 50mm gauge length
OD Range	10mm - 610mm	Round, square, and rectangular profiles available
Wall Thickness	0.5mm - 25mm	Standard and custom thickness options
Length	5.8m - 12m or custom	Standard and custom cut lengths
Surface Finish	Black, galvanized, painted, oiled	Multiple surface treatment options
Application	Structural, furniture, fencing, mechanical engineering	Typical application industries
Certification	EN 10204 3.1, ISO 9001, CE Marking	Quality certifications provided
Packaging	Bundled with steel strips, plastic caps on ends	Standard export packaging
MOQ	5 tons	Minimum order quantity

Welded Steel Tube - High-Strength Carbon Steel Tubing for Structural Applications

Welded steel tube is a versatile carbon steel product manufactured by forming flat steel strip into a tubular shape and joining the seam through high-frequency electric resistance welding (ERW) or submerged arc welding (SAW). Offering a superior balance of mechanical strength, dimensional consistency, and cost-effectiveness compared to seamless alternatives, welded steel tubing serves critical roles in structural frameworks, mechanical assemblies, and fluid transport systems across construction, automotive, and general industrial sectors.

What Is Welded Steel Tube?

A welded steel tube is a hollow steel section produced by rolling steel coil or strip into a cylindrical or rectangular profile and permanently fusing the longitudinal seam using thermal or pressure welding processes. This manufacturing method enables tight dimensional tolerances, high production efficiency, and competitive mill-direct pricing for large-volume orders.

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Welded Steel Tube Technical Specifications

Our welded steel tubing is manufactured according to ASTM A500 Grade B/C for structural hollow sections and ASTM A513 for mechanical tubing. Key parameters include:

Property	Value
Outside Diameter	21.3 mm – 610 mm (¾″ – 24″)
Wall Thickness	1.0 mm – 25.0 mm
Yield Strength (ASTM A500 Gr. B)	290 MPa minimum
Tensile Strength (ASTM A500 Gr. B)	400 MPa minimum
Carbon Content	0.26% maximum per ASTM A500
Length	6 m, 12 m, or custom cut-to-length
Surface Finish	Black, oiled, galvanized, or painted
Shape	Round, square, rectangular

Additional standards available include EN 10219 for cold-formed structural hollow sections and JIS G3444 STK400/STK490 for general structural purposes.

Key Applications of Welded Steel Tubing

Structural frameworks: Building columns, trusses, handrails, and scaffolding systems where ASTM A500 Grade C tubing delivers 317 MPa minimum yield strength.
Mechanical components: Conveyor rollers, machine frames, and automotive chassis parts requiring precise OD and wall tolerances per ASTM A513.
Fluid conveyance: Low-pressure water, gas, and steam lines manufactured to ASTM A53 Grade B with hydrostatic test certification.
Fencing and furniture: Ornamental and commercial applications benefiting from the smooth weld seam and uniform surface of ERW steel tube.

Frequently Asked Questions

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

Standard MOQ starts at 5 metric tons per size. Mixed-size container orders are accepted with a combined minimum of 20 metric tons.

Do you provide material test certificates?

Yes. Every shipment includes EN 10204 Type 3.1 mill test certificates documenting chemical composition, mechanical properties, and hydrostatic or non-destructive test results.

What is the typical delivery time?

Stock sizes ship within 7–10 business days. Custom-produced welded steel tubing typically requires 25–35 days depending on quantity and specification.

Can you cut to custom sizes?

Absolutely. We offer precision cut-to-length service with tolerances of ±1 mm, along with beveling, deburring, and bundling per client requirements.

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Get a Competitive Quote for Welded Steel Tube

Ready to source premium-grade welded steel tubing at factory-competitive pricing? Share your required dimensions, steel grade, quantity, and delivery destination. Our technical sales team will respond with a detailed quotation—including freight estimate and lead time—within 24 hours. Contact us now to get started.

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Ratings & Reviews

4.5

Based on 8 reviews

5 5

4 2

3 1

2 0

1 0

Wei Chen

Singapore

2025-02-17

Acceptable Tube Quality — Delivery Delay Resolved After Follow-Up

Ordered 15 tons of JIS G3444 STK490 round welded tube, OD 165.2mm, 7mm wall, for structural columns on a regional project. Material itself met spec — MTCs confirmed tensile strength at 510 MPa per STK490 requirements and surface finish was acceptable. However, delivery ran 6 days beyond the quoted 30-day lead time without proactive communication from the logistics team. We had to follow up twice before getting an updated ETA. The sales team did apologize and provided a partial freight credit, which was appreciated. No quality issues with the tube itself, so the project was not impacted. Supplier should improve shipment tracking communication — that would make this a straightforward 5-star experience.

Chris Martin

Canada

2025-03-02

Perfect Repeat Order — Consistent Quality Across Three Shipments

This is our third order from this supplier — 20 tons of ASTM A500 Grade B square tube 76.2×76.2mm, 4.78mm wall, 12m lengths, black finish — for handrail and fencing fabrication across multiple commercial sites in Ontario. Quality has been consistent across all three orders: carbon content 0.24% on latest MTCs, yield strength 298 MPa. Cut-to-length accuracy on our custom 5.8m pieces was ±0.7mm, which keeps our downstream fabrication waste minimal. Stock sizes shipped in 8 business days this time. The predictability of lead times and documentation quality is what keeps us coming back. Straightforward to work with at every stage.

Carlos Silva

Brazil

2025-03-24

Reliable Rectangular HSS for Industrial Framework

Placed an order for 22 tons of rectangular hollow structural sections 200×100×6mm, ASTM A500 Grade B, painted finish, for machine base frames at a food processing plant expansion. Material quality was consistent — wall thickness measured 5.95–6.05mm across sample checks, well within tolerance. EN 10204 3.1 certificates were provided digitally before shipment, which helped us clear our client's QA requirements ahead of delivery. Freight coordination to Santos port was handled smoothly. Minor note: paint finish had a few thin spots on cut ends, though this was expected and we touch up on-site anyway. Competitive pricing compared to local distributors. Will continue sourcing from this supplier.