Black Mild Steel Rectangular Hollow Section for Steel Structure Project

1) Section: Square pipe is square section (equal sides), rectangular pipe is rectangular section (long side > short side); 2) Bending performance: Rectangular pipe long side direction has large bending section modulus, stronger bending capacity than same weight square pipe, suitable for beams; square pipe symmetric section, good both bending and torsion, suitable for columns; 3) Sizes: Square pipe side 20-500mm, rectangular pipe 30x20-500x300mm;

Rectangular pipe specified by "long side x short side x wall thickness", e.g., 100x50x4.0 means long side 100mm, short side 50mm, WT 4.0mm. Common sizes: 30x20, 40x20, 40x30, 50x25, 50x30, 50x40, 60x30, 60x40, 80x40, 80x60, 100x50, 100x60, 120x60, 120x80, 140x80, 150x100, 160x80, 180x100, 200x100, 200x150, 250x150, 300x150, 300x200, 400x200, 500x300mm. WT 1.5-16mm.

Yes. Rectangular pipe hot-dip galvanized has 20-30 year anti-corrosion life, suitable for outdoor steel structures, curtain wall skeletons, guardrails. Hot-dip galvanized rectangular pipe RMB 800-1200/tonne more expensive than black (galvanizing fee). Rectangular pipe is hollow section, need tonote zinc flow inside pipe during galvanizing, ensure uniform inner wall galvanizing.

1) Welded connection: Rectangular pipes or with other members directly welded, good sealing, high strength, but not detachable; 2) Bolted connection: Drill holes on rectangular pipe, bolted connection, detachable, suitable for structures needing maintenance; 3) Flanged connection: Welded flange then bolted, detachable, suitable for pipes and structures needing frequent disassembly; 4) Socket connection: Insert small pipe into large pipe, drill holes then pin or bolt fix, convenient construction

Stock from 1 pipe 3-7 days, common sizes same-day pickup; special sizes and materials custom rolling from 5 tonnes 15-30 days. Cutting, drilling, bending, welding, hot-dip galvanizing, painting etc. fabrication services available.