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Help CenterFactory Black Square Weld Tube Q355 Mild Rectangular Welded Pipe For Workshop Steel Structure
Product Spotlights
Refined Metal Grain, Stable & Consistent Mechanical Performance
Wide Size Coverage, Large OD & Heavy Wall Support
Low Impurity Raw Material, Reliable Medium Resistance
Strong Process Adaptability, Multiple Custom Options
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1. Product Introduction
ERW Electric Resistance Welded steel pipe (including round tube, square & rectangular hollow section SHS/RHS) is manufactured by cold forming hot rolled steel strip and high-frequency longitudinal welding without welding wire. It integrates high structural strength, stable welding seam and low cost, the most popular structural steel material for prefab house, labor camp, workshop steel frame, fence and scaffolding.
We supply two surface types: black oiled welded pipe and hot-dip galvanized welded pipe. Raw materials adopt Q235B, Q355B mild carbon steel, complying with ASTM A53, ASTM A500, GB/T3091 international standards. All sizes, wall thickness and lengths can be customized, widely matched with color steel sandwich panel to complete prefabricated building projects.
2. Core Advantages
Stable High-Frequency Welding Seam, High Structural SafetyAdopt advanced HF ERW welding technology, seamless fusion of strip edges, uniform weld without crack or leakage. Good tensile & bending performance, perfect for load-bearing frame of prefab house columns and purlins.
Two Surface Options For Different Working Environments
Black oiled pipe: Low cost, anti-rust oil protection, for indoor temporary construction site cabin frames
Hot-dip galvanized pipe: Full zinc coating ≥80–275g/m², anti-corrosion, anti-rust for outdoor, coastal humid & rainy areas, water supply pipeline
Lightweight & Easy Processing, Save Construction PeriodUniform wall thickness, smooth surface, convenient cutting, punching, bending and welding on site. Light weight reduces transport cost; fast assembly shortens prefab house construction cycle greatly.
Complete Sizes & Full Customization SupportRound tube, square tube, rectangular hollow section available; customize OD, wall thickness, fixed length, end threading, flat cutting, chamfering. OEM marking & packing acceptable for engineering bulk orders.
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Factory Direct Supply, Strict Quality InspectionFull automatic production line, raw material incoming inspection + finished size & weld test before shipment. Provide MTC material test certificate, ISO & CE certification, stable mass delivery for global prefab project buyers.
3. Technical Specification Parameter Table
Item Detailed Technical Data Product Type ERW Round Welded Pipe / SHS Square Tube / RHS Rectangular Hollow Section Raw Material Grade Q235B, Q355B; Equivalent ASTM A53 Gr.B, ASTM A500 Gr.B/C Executive Standard GB/T3091, ASTM A53, ASTM A500, BS1387, EN10255 Surface Treatment Black Anti-rust Oil / Hot Dipped Galvanized Zinc Coating (Z80-Z275)
4. Wide Application Scenarios
Prefabricated Building SystemPrefab house main column, wall purlin, container house frame, temporary dormitory, site office, labor camp support frame, light steel villa skeleton, modular workshop structure
Construction AuxiliaryBuilding scaffolding, guardrail, fence, temporary sentry box, mobile toilet support
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Fluid PipelineLow pressure water supply, drainage pipeline for prefab park, fire protection pipeline
Other EngineeringAgricultural greenhouse frame, solar bracket, factory storage rack, municipal traffic sign support
5. Packaging & Shipment
Stock Pipe Package: Bundled with steel strips, plastic end caps to prevent scratch & mud
Galvanized Pipe: Plastic film wrapped + steel bundle, avoid zinc layer friction damage
Customized Packing: Wooden pallet, plastic bag, OEM label printing as customer request
Loading Port: Qingdao, Tianjin, Shanghai, Ningbo
Lead Time: 7–15 working days after deposit receipt
Send Inquiry to This Supplier
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