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| Property | Parameter | Description |
|---|---|---|
| Product Name | Large Diameter Steel Pipe for Construction | Structural steel pipe used in building foundations, columns, piling, and civil engineering projects |
| Material Grade | ASTM A53 Gr.B / A500 Gr.C / EN 10210 S355J2H / GB/T 8162 20#, Q345B | International equivalents: S355J2H ≈ ASTM A500 Gr.C; Q345B ≈ S355JR; suitable for load-bearing structural applications |
| Standard Compliance | ASTM A53 / A500 / A252; EN 10210 / EN 10219; GB/T 8162 / GB/T 13793; JIS G3444 STK400/490 | Covers seamless and welded (ERW/SAW/LSAW/SSAW) large diameter structural pipes for construction use |
| Chemical Composition (C) | ≤ 0.26% (A53 Gr.B); ≤ 0.23% (S355J2H) | Low carbon content ensures weldability and formability for structural fabrication |
| Chemical Composition (Mn, Si, P, S) | Mn ≤ 1.60%; Si ≤ 0.55%; P ≤ 0.035%; S ≤ 0.035% | Controlled alloying elements improve strength, toughness, and corrosion resistance per ASTM/EN standards |
| Tensile Strength | 415–760 MPa (ASTM A53 Gr.B); 470–630 MPa (EN S355J2H) | High tensile strength ensures structural integrity under heavy construction loads and dynamic forces |
| Yield Strength | ≥ 240 MPa (A53 Gr.B); ≥ 355 MPa (S355J2H / Q345B) | Minimum yield strength guarantees resistance to permanent deformation in load-bearing structures |
| Elongation | ≥ 21% (A53 Gr.B longitudinal); ≥ 22% (S355J2H) | Adequate elongation provides ductility for seismic and impact resistance in construction applications |
| Outer Diameter (OD) | 219 mm – 2,500 mm (8.625 in – 98.4 in) | Large diameter range covers piling pipes, structural columns, bridge supports, and underground utility casings |
| Wall Thickness | 6 mm – 100 mm (0.236 in – 3.937 in) | Heavy wall options available for high-pressure or deep foundation piling applications |
| Length | 6 m – 18 m (customizable) | Standard mill lengths; custom cut lengths available per project specification and transport requirements |
| Surface Finish | Black (mill finish), hot-dip galvanized, epoxy coated, 3LPE/3LPP anti-corrosion coating | Surface treatment selected based on exposure environment: buried, submerged, or above-ground structural use |
| Pipe Type | Seamless (SMLS); ERW; LSAW (UOE/JCOE); SSAW (spiral welded) | LSAW and SSAW preferred for large diameters; seamless for critical high-stress structural sections |
| Application | Building foundations, steel structure columns, bridge piling, port construction, underground tunnels, offshore platforms | Widely used in civil engineering, infrastructure, and heavy construction projects worldwide |
| Certification | ISO 9001:2015; CE Marking (EN 1090); API 5L; BV / SGS / TÜV third-party inspection available | Full mill test reports (MTR), hydrostatic test certificates, and dimensional inspection reports provided |
| Packaging | Bundled with steel strips; end caps fitted; wooden dunnage or steel cradle support; seaworthy export packing | Packaging designed to prevent deformation and corrosion during long-distance ocean or land transportation |
| MOQ | 10 Metric Tons (MT) per size; 50 MT for mixed specifications | Lower MOQ negotiable for project-based procurement; mill direct supply available for large construction contracts |
Initial coating issue on galvanized pipe — resolved satisfactorily
Ordered 90 tons of 457 mm OD x 9.5 mm wall, ASTM A500 Grade C, hot-dip galvanized pipe for a utility support structure project in Ohio. Upon arrival, coating thickness on approximately 12% of lengths measured below the ISO 1461 minimum 85 µm requirement, ranging 72–80 µm on affected sections. I raised this immediately with the quality team. They responded within one business day, arranged third-party re-inspection, and shipped replacement lengths for the non-conforming sections within 10 days at no additional cost. The resolution process was handled professionally. Confident enough to trial another order, but will request pre-shipment coating inspection next time.
Ordered 90 tons of 457 mm OD x 9.5 mm wall, ASTM A500 Grade C, hot-dip galvanized pipe for a utility support structure project in Ohio. Upon arrival, coating thickness on approximately 12% of lengths measured below the ISO 1461 minimum 85 µm requirement, ranging 72–80 µm on affected sections. I raised this immediately with the quality team. They responded within one business day, arranged third-party re-inspection, and shipped replacement lengths for the non-conforming sections within 10 days at no additional cost. The resolution process was handled professionally. Confident enough to trial another order, but will request pre-shipment coating inspection next time.
