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Factory Price Stable Quality ASTM Welded Carbon Square Rectangular Steel Pipe
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Asia Metal delivers high-precision welded carbon steel square and rectangular pipes at factory-direct pricing without compromising structural integrity or dimensional consistency. Manufactured to ASTM A500 Grade B/C and ASTM A513 standards, our pipes are ideal for structural frameworks, industrial equipment, agricultural machinery, furniture, fencing, and architectural applications. The electric resistance welding (ERW) process ensures uniform strength, clean internal surfaces, and excellent corner integrity. With strict in-line quality control and batch traceability, we guarantee stable mechanical performance across every order. Custom sizes, wall thicknesses, lengths, and surface treatments available to match your engineering drawings or project specs.
| Parameter | Standard Range | Customizable Options |
|---|---|---|
| Standards | ASTM A500 Gr. B/C, ASTM A513, EN 10219, GB/T 6728 | Also compliant with JIS G3466, DIN 2395, ISO 657-15 |
| Shape | Square: 20x20mm – 300x300mm Rectangular: 20x30mm – 200x400mm |
Yes — Custom profiles: oval, D-shape, tapered sections |
| Wall Thickness | 1.0mm – 12.0mm | Yes — Tolerance ±0.1mm for precision applications |
| Steel Grade | Q195, Q235, Q345, ASTM A500 Gr. B (Carbon Steel) | Yes — Higher strength: Q420, A572 Gr.50, S355JR |
| Surface Finish | Black (Mill Scale), Oiled, Pickled, Pre-Galvanized | Yes — Powder coated, epoxy painted, color-coded |
| Length | 6m, 12ft (Standard); 5.8m, 11.8ft (Shipping-Optimized) | Yes — Cut-to-length ±3mm; max 14m single piece |
| Corner Radius | 1.5xT (Standard per ASTM) | Yes — Sharp corners or custom radius available |
| Delivery Time | 7–14 Days (Standard Sizes) | Custom orders: 10–20 days; Rush 5-day for stocked profiles |
| Certifications | ISO 9001, SGS, MTC (EN 10204 3.1), CE, ASTM Certified | Additional: RoHS, REACH, Third-Party Dimensional Reports |
| Property | Square & Rectangular Pipe | Test Standard |
|---|---|---|
| Tensile Strength | ≥400 MPa (58,000 psi) | ASTM A370 |
| Yield Strength | ≥290 MPa (42,000 psi) | ASTM A370 |
| Elongation (in 50mm) | ≥23% | ASTM A370 |
| Weld Seam Integrity | 100% Visual + Eddy Current Tested | ASTM E309 / E426 |
| Flattening Test | Pass — No crack at 2/3 flattening per side | ASTM A500 |
| Corner Strength | Uniform hardness, no delamination | Internal QC Procedure |
A: ASTM A500 is designed for structural applications (buildings, frames) with emphasis on yield strength and weldability. ASTM A513 is for mechanical and general fabrication (furniture, machinery) with tighter dimensional tolerances. A500 Gr. B is most common for load-bearing uses.
A: Yes. We offer hot-dip galvanized (40–80μm), electro-galvanized, or powder-coated finishes in standard RAL colors. Pre-finished pipes eliminate your secondary processing, reduce lead time, and ensure uniform coverage — especially on internal corners.
A: Our forming lines use precision roller dies and controlled welding parameters. Every pipe undergoes automated optical inspection for corner radius, weld seam alignment, and surface defects. Hardness testing at corners ensures no work-hardening inconsistencies.
A: Absolutely. Submit your CAD/DXF files — we’ll optimize cutting patterns to minimize waste, pre-cut notches, holes, or miters, and bundle by assembly sequence. Ideal for prefab construction or kit-based manufacturing.
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