DTC Carbon Steel Square & Rectangular Tube | Hollow Structural Section Pipe

Product Overview

DTC carbon steel square & rectangular tubes, also known as hollow structural sections (HSS), are cold-formed hollow steel profiles manufactured from Q235B, Q355B carbon steel coils. With flat four-side surfaces and uniform wall thickness, our square and rectangular tubes deliver superior bending and torsion resistance compared with round pipes, making them the preferred structural material for construction, machinery manufacturing and municipal engineering projects.

Core Product Advantages

• High Structural Strength Square & rectangular hollow design provides excellent anti-bending and anti-torsion performance
• Flat Surface for Easy Processing Four flat sides simplify cutting, welding, punching, painting and galvanizing
• Stable Dimension Tolerance Precise forming control ensures consistent outer size and wall thickness
• Multiple Surface Options Black bare steel, hot-dip galvanized, painted anti-rust finish available
• Wide Size Selection Complete range of square & rectangular sizes for light to heavy load structures
• Cost-Effective Structural Material Lighter weight than solid steel bar with equal bearing capacity

Product Types & Sizes

• Square Tube: 10×10mm ~ 400×400mm, wall thickness 1.2mm ~ 16mm
• Rectangular Tube: 20×10mm ~ 500×300mm, wall thickness 1.2mm ~ 16mm
• Material Grade: Q235B for general structure, Q355B for high load heavy structure

Technical Specifications

• Raw Material: Q235B, Q355B carbon steel strip
• Production Process: Cold forming + high frequency welding
• Standard Length: 6m, 9m, 12m, custom cut lengths supported
• Surface Treatment: Black as-rolled, hot-dip galvanized, anti-rust oil, epoxy paint
• Executive Standards: GB/T 6728, ASTM A500, EN 10219
• Application Temperature: -20℃ ~ +425℃

Main Application Scenarios

• Steel structure workshop, warehouse, residential building frames
• Road guardrails, highway noise barrier support frames
• Construction scaffolding and temporary support structures
• Mechanical equipment racks, agricultural machinery frames
• Greenhouse agricultural support frames
• Container frame, trailer and vehicle chassis components
• Stair handrails, outdoor fence and decorative frames

Quality Control & Assurance

All DTC square and rectangular steel tubes are produced under ISO 9001 quality management system. Each batch undergoes dimensional measurement, wall thickness inspection, tensile strength test and weld seam flaw detection before delivery. Complete MTR material test reports can be provided for project bidding and acceptance. Custom size, galvanization and cutting service are supported for bulk orders.

Send us your size drawing or load requirement for customized quotation!