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ISO 9001:2015 · CE · SGS / BV READY

SQUARE AND RECTANGULAR STEEL TUBE

Carbon, alloy, seamless and sharp-corner square & rectangular sections -- every piece backed by an original mill test certificate and cut to your drawing before loading.

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Aug 12, 2026

Q235 Q345 A36 Pre Galvanized Square Rectangular Steel Tube Supplier

<p><strong>Q235 Q345 A36 Pre-Galvanized Square & Rectangular Steel Tube, ERW welded, custom side length, wall thickness, and length</strong> — pre-galvanized zinc coating delivers uniform corrosion resistance for outdoor and concrete-embedded structural use, covering GB grades alongside SS400 and A36 for international project compatibility. - Full traceability with original mill test certificates, ISO 9001:2015 certified, and SGS/BV third-party inspection available for every shipment.</p>

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Aug 12, 2026

Q235 Q345 Galvanized Square Rectangular Steel Tube 1-30mm ERW Supplier

<p><strong>Q235 Q345 Galvanized Square Rectangular Steel Tube, ERW welded, wall thickness 1–30 mm, side length 20–500 mm</strong> — hot-dip galvanized zinc coating 30–275 g/m² ensures corrosion resistance for outdoor structural frames, scaffolding, and machinery bases. Q235 covers general construction while Q345 delivers higher yield strength for load-bearing applications. Custom cutting, punching, and bending available per drawing.</p> <ul> <li>Steel grades Q195/Q235/Q355 mapped to S235JR/S275JR/S355JR/SS400/A36 for global equivalence</li> <li>Original mill test certificate with heat number traceability provided before shipment</li> <li>ISO 9001:2015 and CE certified, third-party inspection via SGS/BV supported for smooth customs clearance</li> </ul>

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Aug 12, 2026

ASTM A500 Gr.B Rectangular Steel Tube 15×20-700x800mm Supplier

<p><strong>Gr.B Rectangular Steel Tube, ASTM A500, wall thickness 1–30 mm, sizes 15×20 to 700×800 mm</strong> — available in ERW welded and seamless techniques with hot-dip galvanized, black painted, or bare surface treatment per project specification. Custom cut-to-size and non-standard dimensions supported to reduce on-site rework. Full range of structural hollow sections in stock with original mill test certificates, ISO 9001:2015 and CE certification, plus SGS/BV third-party inspection for complete traceability and smooth customs clearance.</p>

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Aug 12, 2026

ASTM A500 GR.B Rectangular Steel Tube 1-30mm Wall Hot Dipped Galvanized Supplier

<p><strong>GR.B Rectangular Steel Tube, ASTM A500, wall thickness 1–30 mm, sizes 15×20 to 700×800 mm</strong> — hot dipped galvanized (200–700g/sqm zinc coating) or black painted, ERW welded with ±1% tolerance control, available in S235/S275/S355/STK400 grades for structural frames, curtain walls, and infrastructure supports. Full range sizes in stock with original mill test certificates, ISO 9001:2015 and CE certified, third-party inspection (SGS/BV) available before shipment.</p>

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Aug 12, 2026

Q235B Galvanized Square Rectangular Steel Tube ASTM Custom Cutting Supplier

<p><strong>Q235B Galvanized Square and Rectangular Steel Tube, ASTM, wall thickness 0.5–200 mm, length 6 m / 12 m</strong> — hot-dip galvanized surface delivers strong corrosion resistance for outdoor structural frames, bridges, and fluid transport systems. Available in Q195–Q460 grades with ±1% thickness tolerance and custom cutting, bending, and punching services to reduce on-site rework. ISO 9001:2015 and CE certified with original mill test certificates and SGS/BV third-party inspection for full traceability and smooth customs clearance.</p>

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Aug 12, 2026

Q235 Q345 Galvanized Rectangular Steel Tube 0.5-200mm ASTM CE Supplier

<p><strong>Q235 Q345 Galvanized Rectangular Steel Tube, ASTM/JIS, wall thickness 0.5–200 mm, lengths 6 m / 6.4 m / 12 m</strong> — hot dipped galvanized surface ensures superior corrosion resistance for outdoor, marine, and underground applications. Grade range covers Q195–Q460 and SS330–SS540 with ±1% tolerance, suitable for both light structural frames and heavy-load infrastructure. - Custom cut-to-size processing available to reduce on-site fabrication work - Original mill test certificates with full heat number traceability provided with every shipment ISO 9001:2015 and CE certified, with SGS/BV third-party inspection and complete export documentation for smooth global customs clearance.</p>

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Aug 12, 2026

Q235B Q345B Galvanized Square Rectangular Steel Tube ASTM Custom Cutting Supplier

<p><strong>Q235B Q345B Galvanized Square Rectangular Steel Tube, ASTM, wall thickness 0.5–200 mm, length up to 12 m</strong> — hot-rolled or cold-rolled SHS/RHS with zinc coating for corrosion resistance in outdoor and structural environments. Available in DC51D+Z, DC52D+Z, DC53D+Z grades for varying forming depths, with custom cutting, bending, and punching services to reduce on-site rework. Every shipment includes original mill test certificates, ISO 9001:2015 certification, and third-party inspection by SGS or BV for full traceability and smooth customs clearance.</p>

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Aug 11, 2026

Q235 Galvanized Square Steel Tube 20×20-150x150mm Supplier

<p><strong>Q235 Galvanized Square Steel Tube, 20×20–150×150 mm, length 1–12 m</strong> — hot-rolled carbon steel with zinc coating for long-term anti-corrosion protection in outdoor and structural environments. Available in square and rectangular sections up to 800×800 mm with custom cutting to reduce on-site rework. - ISO 9001:2015 and CE certified with original mill test certificates and SGS/BV third-party inspection for full traceability.</p>

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Send grade, dimension and tonnage. We return an equivalent-grade proposal, cutting plan and loading method for your port within 12 working hours.

  • Original mill test certificate, heat-number traceable
  • Plasma / flame cutting to your drawing (± 2 mm typical)
  • Flatbed, open-top and break-bulk shipping planning

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