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Help CenterHot Rolled Cold Drawn Square Tube Q235B Q355B Carbon Square Hollow Section For Construction Frame
Product Spotlights
Thin & thick wall full specifications
Galvanized anti-corrosion optional
Easy welding, cutting & drilling
Custom cut & processing available
Factory price with full export certificates
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1. Product Overview
Square tube, also known as square pipe or square hollow section (SHS), is a cold-formed welded structural steel profile with regular square cross-section. It is widely adopted for load-bearing frames due to balanced stress distribution and neat appearance.Our factory supplies full-spec square tubes compliant with GB, ASTM and EN standards, including multiple steel grades and surface finishes. Thin, medium and thick wall options are available for light-duty, medium and heavy-duty projects. Custom cutting and secondary machining services are supported to meet diverse construction, new energy and mechanical manufacturing demands.
2. Specifications & Technical Parameters
| Item | Details |
|---|---|
| Material | Carbon Mild Steel |
| Available Steel Grades | Q235B, Q355B, ASTM A500 Grade B, S235JR, S355JR |
| Production Standards | GB/T6728, ASTM A500, EN 10219 |
| Production Process | Cold Formed Welded; Seamless Square Tube Optional |
| Classification | Thin Wall / Medium Wall / Thick Wall Square Tube |
| Surface Treatment | Black Welded Finish, Anti-rust Primer Painted, Hot Dipped Galvanized |
| Standard Length | 6m, 9m, 12m; Custom Cut Length Available |
| Size Scope | Outer Dimension: 10×10mm ~ 400×400mmWall Thickness: 0.8mm ~ 20mm |
3. Core Product Advantages
Accurate forming & stable structureUniform square outline, consistent wall thickness and straight tube body without twisting or bending. Smooth internal and external surfaces with clean welding seams, no burrs, greatly saving polishing labor cost. Balanced four-side stress distribution brings better stability than angle steel for frame fabrication.
Reliable mechanical performancePremium carbon steel raw material with uniform internal texture, free of pores, cracks and impurities. High tensile & yield strength, strong compression and load-bearing capacity. Q355 and A500 Grade B high-strength grades satisfy heavy-load chassis and large-span steel structures.
Multiple anti-corrosion solutions
Black welded square tube: cost-effective for indoor warehouse frames and internal equipment supports.
Primer coated tube: temporary rust protection, convenient for customer secondary painting.
Hot dipped galvanized tube: dense, uniform zinc coating with strong adhesion, resisting moisture, acid, alkali and seawater erosion, perfect for solar brackets, greenhouses and coastal outdoor projects.
Comprehensive custom machining serviceSupport fixed-length cutting, drilling, punching, bending and laser cutting according to drawings. Mixed-size bundling and personalized export packaging are acceptable. Full stock of thin to thick wall sizes for fast delivery.
Factory direct supply & complete certificationManufacturer direct sales without middlemen to offer competitive wholesale price. Small MOQ is acceptable; mixed container loading with I beam, channel steel and angle steel is supported. Each batch comes with original MTC, SGS third-party inspection, CE and full set of customs clearance certificates.
4. Wide Application Scope
New Energy: Solar mounting brackets, photovoltaic support frames
Construction Industry: Factory & warehouse steel frames, building partition supports
Agriculture: Greenhouse frames, breeding shed brackets
Municipal Works: Road guardrails, billboard supports, pipeline frames
Machinery Manufacturing: Equipment bases, vehicle chassis, mechanical stands
Outdoor Projects: Fence frames, platform structures, coastal anti-corrosion frames
5. Packaging & Shipment
Packing: Bundled with high-tensile steel strips, wrapped by waterproof plastic film, loaded on export wooden pallets to prevent collision damage during sea transit.
Loading Ports: Qingdao Port, Tianjin Port, Shanghai Port
Trade Terms: EXW, FOB, CFR, CIF
Lead Time: 7–15 working days for spot stock; 15–25 working days for customized mass orders
Loading Method: Mixed loading with other structural steel profiles to maximize container utilization.
6. FAQ
Q1: Do you supply thin wall and thick wall square tubes?A: Yes, we cover full range sizes from light thin wall to heavy thick wall square hollow sections for different load requirements.
Q2: Is galvanized square tube available?A: Hot dipped galvanized treatment is provided for long-term anti-rust outdoor and coastal use.
Q3: Can we customize cutting length and drilling holes?A: Free fixed-length cutting service is offered; drilling, punching and other deep processing are supported.
Q4: What is your minimum order quantity?A: MOQ is 1 ton, small trial orders are warmly welcomed.
Q5: Can you provide material test certificate?A: Original MTC will be provided for every shipment, and third-party inspection reports can be arranged as requested.
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