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Help CenterSquare Steel & Square Tube，ASTM A500，EN10210、EN10219，JIS G3466
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Product Overview
Product Definition: Square Tube is hollow section steel with square cross‑section, divided into Welded Square Tube and Seamless Square Tube. It features excellent bending & torsion resistance, widely used as main hollow load‑bearing profile for steel‑structure and mechanical processing.
Production Process: Welded Square Tube is high‑frequency welded from steel strip with high productivity and complete sizes. Seamless Square Tube is cold‑drawn or hot‑extruded from seamless round pipe, weld‑free with outstanding pressure‑bearing capacity. Regular shape of Square Tube can be directly used for frame & support components to reduce machining work.
Product Difference: Ordinary Square Tube fits common building frames and guardrails. Welded Square Tube is cost‑effective with sufficient stock. Seamless Square Tube applies to heavy‑duty & high‑pressure working conditions with strict weld‑free requirements.
Processing Performance: Square Tube supports cutting, punching, bending, welding, sandblasting, painting, hot‑dip galvanizing and other secondary operations. Welded Square Tube suits mass regular projects; Seamless Square Tube meets high‑strength special equipment processing demand.
Application Feature: Square Tube enjoys stable supply and full‑range specifications. Welded Square Tube and Seamless Square Tube are widely applied in workshop steel‑structure, equipment frames, municipal guardrails, greenhouse frames, engineering machinery and other projects.
Advantages
Excellent section performance, light weight & high strength: Hollow square cross‑section of Square Tube brings large moment of inertia with superior bending and torsion resistance. Welded Square Tube features stable forming and anti‑distortion performance. Seamless Square Tube owns uniform metal structure for strong anti‑impact capacity under high pressure.
Good welding & processing property: Square Tube has uniform material for stable cutting, bending and welding performance.Welded Square Tube facilitates on‑site steel‑structure prefabrication & assembly. Seamless Square Tube can be directly machined with high finished‑product rate.
Stable mechanical performance: Square Tube achieves balanced strength‑toughness ratio. Weld seam of Welded Square Tube is online treated with strength close to base metal. Seamless Square Tube has no welding defects for heavy‑load and alternating‑force conditions.
Complete specifications & flexible customization: Square Tube covers wide size range from small to large bore. Welded Square Tube has abundant stock; Seamless Square Tube can produce heavy‑wall non‑standard sizes for special drawing requirements.
Diversified surface treatment: Square Tube can be delivered in black finish, also available for pickling, sandblasting, hot‑dip galvanizing anti‑corrosion. Galvanized Welded Square Tube for outdoor guardrail & greenhouse; polished Seamless Square Tube for direct equipment assembly.
Material & Specifications
Material Grade: Q235B, Q355B/C/D, 20#, 45#; export grades A36, SS400, S235JR, S355JR, qualified for Square Tube production.
Welded Square Tube Size: Side 20‑500mm, wall thickness 1.5‑16mm, rich standard sizes for mass supply.
Seamless Square Tube Size: Side 20‑400mm, wall thickness 3‑30mm. Heavy‑wall heavy‑duty Square Tube adopts seamless process, non‑standard sizes customizable.
Standard Length:6m,9m,12m, custom cut‑length 2‑12m available for Square Tube engineering nesting.
Delivery Condition: Welded Square Tube black welded finish with smooth weld seam; Seamless Square Tube hot‑rolled or cold‑drawn finish, weld‑free & burr‑free on inner & outer surface.
Tolerance: Welded Square Tube complies with GB/T6728; Seamless Square Tube complies with GB/T3094. Good squareness and straightness to reduce correction work.
Standards
Domestic Standard: GB/T 6728‑2017 Cold‑formed steel sections; GB/T3094‑2012 Cold‑drawn special‑shaped steel tubes; GB/T1591 for low‑alloy steel grade. All Square Tube produced and inspected per national standard.
International Standard: ASTM A500, EN10210, EN10219, JIS G3466. Export‑oriented Welded Square Tube and Seamless Square Tube satisfy import inspection of multiple countries.
Application
Steel‑structure Project: Workshop frames, steel‑structure supports, curtain wall keel, widely adopt Square Tube and Welded Square Tube.
Machinery Manufacturing: Equipment frames, engineering machinery components. High‑pressure heavy‑duty parts prefer Seamless Square Tube.
Municipal & Agricultural Engineering: Road guardrails, lamp‑post supports, greenhouse frames. Hot‑dip galvanized Square Tube widely used for outdoor projects.
General Processing: Container accessories, storage racks, equipment bases. Qualified Welded Square Tube and Seamless Square Tube guarantee reliable quality for all frame‑type structures.
Packing & Delivery
Packing: Bundled with steel straps, each bundle labeled with grade, size and heat‑number. Export reinforced packing with clear shipping marks to avoid bump damage & tube‑end deformation for Square Tube.
MOQ:5‑10 Metric Tons, support bulk purchase and custom cut‑length orders.
Lead Time:3‑7 days for stock Welded Square Tube;12‑20 working days for special‑grade, heavy‑wall Seamless Square Tube & non‑standard sizes.
Loading Port:Qingdao, Tianjin, Lianyungang.
Inspection: Tensile test, bend test, dimension & visual inspection for every batch of Square Tube. Extra weld seam inspection for Welded Square Tube; extra inner‑outer non‑destructive test for Seamless Square Tube. Mill test certificate, SGS / CE third‑party reports are available.
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