| Product Name | Hot-Dip Galvanized Seamless Steel Pipe |
|---|---|
| OD | 10.3mm – 610mm (1/8" – 24") |
| WT | 1.0mm – 60mm (Sch10 – XXS) |
| Length | 5.8m / 6.0m / 11.8m / 12.0m (custom) |
| Galvanizing | Hot-Dip Galvanized (HDG) per ISO 1461 |
| Standard | ASTM A106/A53, API 5L, EN 10210, GB/T 8163 |
| Grade | 10#, 20#, 45#, Q345B, A106B, A53B, S355J2H |
| MOQ | 2 Tons |
Hot-dip galvanized seamless steel pipes combine the superior mechanical properties of seamless pipe (no weld seam, homogeneous structure, high pressure capacity) with the excellent corrosion resistance of hot-dip galvanizing. The seamless pipe is manufactured from solid round billets through piercing and hot rolling, then immersed in a molten zinc bath at ~450°C to form a metallurgically bonded zinc-iron alloy coating.
This combination makes them ideal for demanding applications requiring both strength and corrosion resistance: high-pressure fluid transportation, oil & gas pipelines, fire protection systems, structural columns in corrosive environments, marine applications, and chemical processing. Available with plain, threaded, or bevelled ends.
| Attribute | Specification |
|---|---|
| Product Name | Hot-Dip Galvanized Seamless Steel Pipe |
| OD Range | 10.3mm – 610mm (1/8" – 24") |
| Wall Thickness | 1.0mm – 60mm (Sch10, Sch40/STD, Sch80/XS, Sch160, XXS) |
| Length | 5.8m, 6.0m, 11.8m, 12.0m; Max 18m upon request |
| Manufacturing | Hot rolled seamless pipe → Hot-dip galvanizing (per ISO 1461) |
| Zinc Coating | Average: 300-610 g/m² (40-85μm); Minimum local: 200-500 g/m² depending on wall thickness |
| Standard | ASTM A106 Gr.B (seamless CS for high temp), ASTM A53 Gr.B (galvanized pipe), API 5L Gr.B/X42-X70, EN 10210 S235-S355J2H, EN 10255 (galvanized tube), GB/T 8163 (fluid seamless), GB/T 3091 (galvanized welded pipe standard applied to seamless) |
| Steel Grade | 10# (equivalent 1010), 20# (equivalent 1020), 45#, Q345B, A106 Gr.B, A53 Gr.B, API 5L Gr.B/X42, S355J2H, St52 |
| Pipe End | Plain end, threaded (NPT/BSPT) & coupled, bevelled (30°-35°), grooved |
| Section Shape | Round |
| Inspection | Seamless pipe: ultrasonic flaw detection, eddy current, hydrostatic pressure test, mechanical testing (tensile, yield, elongation, flattening, bend, impact). Galvanizing: zinc coating mass (ASTM A90), coating uniformity (copper sulfate dip), adherence (bend/hammer test), surface inspection. |
| Application | High-pressure water/oil/gas pipelines, fire sprinkler systems (FM approved), oil & gas gathering lines, chemical process piping, structural columns (corrosive environment), marine piping, irrigation systems, geothermal piping |
| MOQ | 2 Tons |
| Supply Ability | 5,000+ Tons/month |
| Delivery Time | 10–25 days after order |
| Price Term | FOB / CIF / CFR |
| Payment | T/T (30% advance, 70% against B/L), L/C at sight |
| Property | Hot-Dip Galvanized (HDG) | Pre-Galvanized (GI Pipe) |
|---|---|---|
| Coating Process | Finished pipe dipped in molten zinc | Steel coil galvanized before pipe forming |
| Zinc Thickness | 40-85μm (300-610 g/m²) | 5-15μm (40-120 g/m²) |
| Coating Coverage | Full coverage inside & outside | Weld seam area uncoated |
| Corrosion Life | 20-50 years (rural/urban) | 5-15 years |
| Cut/Weld Protection | Cathodic protection extends to cut edges | Cut edges exposed, bare weld seam |
| Cost | Higher | Lower |
| Best For | Outdoor, corrosive, structural | Indoor, light duty, conduit |
All galvanized seamless pipes are manufactured under ISO 9001:2015 certified quality management system. Seamless pipe testing per ASTM/EN standards: ultrasonic flaw detection (100% for high-pressure grades), eddy current inspection, hydrostatic pressure test (minimum 5MPa hold for 10 seconds). Galvanizing testing per ISO 1461: zinc coating mass (gravimetric ASTM A90), coating uniformity (copper sulfate dip test ASTM A239, 4-6 dips depending on grade), coating thickness (magnetic gauge ASTM E376), adherence test (no peeling/cracking after bending). Dimensional inspection: OD ±1% or ±0.5mm, WT ±12.5% or per standard, length as ordered. Mill Test Certificates (EN 10204 3.1) provided.
Thread Protection: Galvanized threads cut after galvanizing per standard (threads may appear uncoated — this is normal per ASTMA 53/EN 10255). Thread protectors (plastic caps) applied to both ends.
Packaging: Hexagonal bundles with steel strapping (3-5 straps). Maximum bundle weight: 2 tons. Waterproof plastic wrapping. Wooden pallets for small OD pipes. Color marking bands for grade identification. Custom labeling and barcoding available.
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