Product Basic Information
| Item | Detailed Description |
| Product Name | ERW Rectangular Steel Pipe Q355 Building Frame Hollow Tube |
| Alternatives | Q355 ERW rectangular hollow tube, Q355 building frame steel pipe, ERW hollow structural steel tube, Q355 rectangular steel section, construction frame rectangular steel pipe |
| Product Type | Electric Resistance Welded (ERW) Hollow Structural Section (HSS) |
| Main Application | Building frame construction, structural support, warehouse framework, bridge engineering, mechanical equipment frame, stadium & exhibition hall structural engineering |
| Brand Positioning | High-strength low-alloy structural steel pipe for heavy-duty building frame engineering |
Product Standard & Material Grade Specification
| Item | Specification Details |
| Steel Grade | Q355 (Q355B/Q355C/Q355D, upgraded from traditional Q345 grade) |
| Executive Standards | EN 10219, GB/T 6728, ASTM A500, JIS G 3466, BS Standard |
| Material Feature | Low alloy high strength carbon steel, excellent toughness, weldability and pressure resistance, stable mechanical properties for long-term structural load-bearing |
| Grade Advantage | Higher yield strength than Q235 and Q345 steel, stronger anti-deformation and anti-seismic performance, suitable for high-rise and heavy-load building frames |
Dimensional Parameter Range (Customizable)
| Parameter Item | Available Size Range |
| Section Size (Width × Height) | 10×15mm - 400×300mm (custom special sizes acceptable) |
| Wall Thickness | 0.8mm - 16.0mm (heavy thickness for heavy-duty construction frames) |
| Standard Length | 6m / 12m (custom length: 3m-14m available) |
| Dimensional Tolerance | ±0.5mm (strict tolerance for precise building frame assembly) |
| Section Shape | Strict rectangular hollow section, flat and smooth surface, uniform wall thickness |
Mechanical & Physical Performance
| Performance Index | Test Standard Value |
| Yield Strength | ≥355MPa |
| Tensile Strength | 470 - 630MPa |
| Elongation Rate | ≥21% |
| Impact Toughness | Qualified at normal / low temperature (adapt to various construction environments) |
| Welding Performance | Excellent weldability, no crack after welding, stable structural integrity |
Production Technology & Process Flow
| Process Item | Detailed Process Description |
| Forming Technology | ERW (Electric Resistance Welding) cold forming technology, high-frequency welding molding |
| Weld Feature | Integrated seamless weld, high welding density, no air holes, strong pressure resistance, not easy to crack |
| Production Process | Raw material inspection → cold rolling forming → high-frequency ERW welding → weld polishing → fixed-length cutting → straightening → surface treatment → quality testing → packaging |
| Processing Advantage | High dimensional accuracy, smooth inner and outer wall, uniform stress distribution, perfect for building frame load-bearing structure |
Surface Treatment & Packaging
| Item | Details |
| Surface Treatment Options | Black pickled finish, hot-dip galvanized, cold galvanized, painted, anti-rust oil coating |
| Surface Quality | No rust, no burr, no scratch, flat and tidy surface |
| Packaging Method | Standard seaworthy packing: steel bundle packing with steel strips, waterproof plastic film wrapped, anti-collision protection |
| Shipping Adaptability | Suitable for long-distance sea transportation, moisture-proof, anti-rust, anti-damage |
Products Description
| Advantage Dimension | Specific Advantages |
| Structural Performance | Q355 high-strength material, superior load-bearing capacity, anti-seismic and anti-deformation, durable for decades in building frame structures |
| Cost Performance | ERW mature process, lower cost than seamless pipe, higher strength than ordinary Q235/Q345 pipe, optimal choice for engineering cost control |
| Engineering Adaptability | Light weight but high rigidity, convenient for cutting, welding and installation, greatly improving construction efficiency |
| Quality Stability | 100% factory inspection, compliant with international standards, stable batch quality, zero defect rate for engineering projects |
Application
| Application Field | Specific Usage Scenarios |
| Building Construction | High-rise building frame, factory warehouse steel structure, residential building load-bearing support, mezzanine floor frame |
| Public Engineering | Stadiums, exhibition halls, airport terminals, subway auxiliary structures, bridge support frames |
| Industrial Manufacturing | Mechanical equipment frame, conveyor support, engineering machinery base, industrial workshop steel truss |
| Other Projects | Greenhouse steel structure, fence frame, offshore platform auxiliary structure, municipal engineering support components |
Factory Supply & Service Terms
| Service Item | Detailed Terms |
| Supply Capacity | Annual output 150,000 tons, sufficient stock, fast bulk delivery |
| Custom Service | Support OEM/ODM, custom size, surface treatment, logo printing as customer requirements |
| MOQ | 1 Ton for conventional sizes, small batch trial order acceptable |
| Delivery Time | Stock goods: 3-7 days; Custom goods: 10-15 working days |
| Certification | ISO9001, CE, SGS, BV inspection certification, full test reports provided |
| After-sales Service | 24-hour online service, quality problem free replacement, professional engineering technical support |
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