Tianjin Tianyingtai Steel Pipe Co., Ltd. is one of the most credible manufacturers and suppliers of black annealed hollow pipe in China. Welcome to consult the quotation and import cheap black annealed hollow pipe made in China here from our factory.
✅️Direct Manufacturer - 20+ years of experience, factory direct price
✅️Certified Quality - ISO 9001, CE
Black Square Steel Pipe (also known as Black Square Hollow Section / SHS) is manufactured from high-quality hot-rolled or cold-rolled steel coils through high-frequency electric resistance welding (ERW). With its uniform wall thickness, excellent weld seam strength, and superior mechanical properties, it is widely used in construction, infrastructure, agriculture, sports equipment, and fluid transportation applications.
Produced in compliance with GB, BS, EN, ASTM, API, and JIS international standards, our square steel pipes offer exceptional dimensional accuracy, easy fabrication, and reliable performance - making them the preferred choice for engineers, contractors, and distributors worldwide.
| Feature | Details |
|---|---|
| Wide Size Range | Square 20×20 to 400×400mm; Rectangular 20×40 to 300×400mm |
| Flexible Wall Thickness | From 1.2mm (light-duty) to 20mm (heavy-duty structural) |
| Custom Length | Standard 4.5–12m, cut-to-length service available |
| Multiple Material Grades | Q195 / Q235 / Q345 to meet different strength requirements |
| International Standards | GB/T 6728, BS 1387, EN 10219, ASTM A500, API 5L, JIS G3466 |
| Cost-Effective | Mill-direct price, 20–40% cheaper than seamless pipes |
| Easy Processing | Excellent weldability, cuttability, drilling, bending, and painting |
| Strong & Durable | High strength-to-weight ratio; service life 15–25 years |
✉️Contact us today for the best factory price! Please provide the required size, wall thickness, length, material grade, quantity, and destination port - our sales team will respond within 12 hours with a detailed quotation and technical datasheet.
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