Bulk Supply · No Middlemen · 2,800+ Specifications
Q235 ASTM Square Seamless Steel Tube 10-100mm Factory Direct Supplier
Q235 Square Seamless Steel Tube, ASTM, outer diameter 10–100 mm — hot-rolled carbon steel with ±1% tight tolerance, ideal for high-pressure fluid, boiler, and hydraulic pipeline systems. Non-oiled finish ensures optimal weldability, with full processing services including cutting, bending, and punching available. Factory-direct pricing with original mill test certificates and SGS/BV third-party inspection for every batch.
- ISO 9001:2015
- CE EN 10210 / 10219
- FPC Certified
- Mill Test Certificate
- SGS / BV On Request
- 1 t
- Trial MOQ
- 12 h
- Quote Reply
- 3-7 d
- Stock Dispatch
- 100%
- With Mill Certs
Send your size list, grade and monthly tonnage -- our export team returns pricing, stock status and documentation plan.
Technical Data
Specification parameters.
Non-standard sizes, grades and surface finishes are produced to order. Confirm exact tolerances with our engineering team before contract.
| Parameter | Value |
|---|---|
| Material Grade | Q195 - Q690 · 201 / 304 / 316L · ASTM A500 |
| Standard | ASTM A554 / A500 · EN 10219 / 10210 · JIS G3466 · GB |
| Production Type | ERW Welded · Seamless · Hot Dip Galvanized |
| Size Range | 20×20 - 500×500 mm · Wall thickness 0.8 - 20 mm |
| Length | 5.8 m / 6 m / 12 m · Custom cutting available |
| Surface Finish | BA Mirror · No.4 Satin · Pickled · Galvanized |
| MOQ | 1 ton trial order · Full container contract volume |
| Lead Time | Ready stock 3-7 days · Custom 15-25 days |
| Packing | Plastic film + woven bag + steel strapping, seaworthy |
| Port / Terms | FOB Qingdao · CIF / CFR · EXW negotiable |
Where It Is Used
Application scenarios.
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Construction & Structural
Steel frames, curtain wall supports, canopies and load-bearing hollow sections for commercial projects.
-
Infrastructure Projects
Highway guardrails, bridge components, transmission towers and municipal engineering works.
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Machinery & OEM
Equipment frames, agricultural machinery, conveyor structures and fabricated assemblies.
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Architecture & Decoration
Handrails, balustrades, interior fittings and decorative mirror-finish stainless tube.
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Furniture & Hardware
Shelving systems, display racks, office furniture tubing and hardware wholesale supply.
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Energy & Petrochemical
Fluid conveyance frameworks, platform structures and corrosion-resistant piping supports.
Inquiry · Factory-Direct Supply
Request a quotation for
Q235 ASTM Square Seamless Steel Tube 10-100mm Factory Direct Supplier
Share your required sizes, steel grades, monthly tonnage and destination port. Our export team returns a loaded-container quotation within 12 hours, including stock status, lead time and full documentation plan.
sales@xinjiyuan-steel.com · +86 531 8888 0000 · Mon-Sat 08:30-19:00 GMT+8
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20,000+
Tons monthly capacity
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2,800+
Specifications in stock
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50+
Countries served
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3
Production lines
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