SS400 Square Hollow Section Pipe

1. Standard compliant JIS G3101 SS400 square & rectangular hollow section, also available in Q235B, Q345B, ASTM A36 multi-grade options, certified ISO9001 & SGS
2. Complete size portfolio: Square 15*15–300*300mm, Rectangle 10*20–200*400mm, wall thickness 1.0–17.75mm with full custom dimensions supported
3. Multiple forming techniques: ERW welded, cold rolled, hot rolled to meet different structural load requirements
4. Diversified surface treatments: Bare black, anti-rust oil, hot galvanized, painted, powder coated & customized anti-corrosion finish
5. Strict full inspection before shipment: Chemical composition test, mechanical property test, hydrostatic test, dimensional & visual inspection, NDT non-destructive test
6. Stable monthly production capacity up to 5,000 tons, fast delivery within 15 working days upon deposit or irrevocable L/C at sight
7. Standard export packaging: Small sizes bundled with steel strips, large diameters bulk loaded; pipe end plastic caps to avoid transport collision & scratch damage
8. Wide global market coverage: North/South America, Europe, Southeast Asia, Middle East, Africa, Oceania & domestic construction projects

SS400 Square Hollow Section (SHS/RHS) is hot & cold formed ERW welded structural hollow tube manufactured per JIS G3101 standard. It adopts continuous forming & high-frequency welding production process, with flat smooth surfaces, uniform wall thickness and stable section rigidity.

We supply black bare original finish as standard stock, and provide customized galvanizing, paint coating for outdoor & coastal anti-rust demands. All sizes from tiny thin-wall tubing to heavy thick-wall large square pipes are available. Each batch is from the same furnace with unified batch marking to guarantee material consistency.

Widely applied in machinery frames, building steel structures, shipbuilding, automobile chassis, scaffolding and pipeline conveying systems, supporting secondary cutting, punching, bending and CNC precision machining per customer drawings.

• SS abbreviation stands for Steel Structure, tensile strength range 400–510MPa, minimum yield strength 245MPa for thickness ≤16mm
• Excellent ductility, outstanding weldability and cold bending performance, easy for cutting, stamping and all mainstream welding processes
• Loose chemical control standard focusing on mechanical performance, low phosphorus & sulfur impurities to avoid brittleness
• Cost-effective universal structural material for indoor & normal temperature outdoor engineering
• No mandatory low-temperature impact test, not recommended for severe cold service environments

• General low carbon structural steel, min yield ≥235MPa, balanced strength & economy for conventional frames
• Stable performance for construction, fence and light mechanical supports

• High-strength low-alloy grade, min yield ≥345MPa, suitable for large-span heavy-load building & equipment frames

• Popular American structural carbon steel, widely used for export North & South American engineering projects

1. Mild Structural Carbon Hollow Section: SS400, Q235B/S235JR, Q345B/S355JR, ASTM A36, St37
2. Standard Round Carbon Pipe: ASTM A500 Grade B, ASTM A53, A106 Gr.B, API 5L line pipe
3. High Temperature Alloy Tube: ASME SA335 P11/P22/P91, ASTM A519 mechanical alloy pipe
4. Stainless Structural Tube: 304, 316L square & rectangular hollow sections
5. Corrosion Resistant Special Alloy: Alloy 28 seamless pipe, ASTM B167 nickel alloy tube

Symmetrical square/rectangular cross-section provides superior torsional resistance compared to round pipes, ideal for frame & support components.

Full thin-wall to heavy-wall specifications, multiple anti-rust surface treatments to match indoor, outdoor, coastal different service environments.

High-frequency ERW welding line with online NDT inspection, no hidden crack defects inside welding seams.

Low-carbon base supports cutting, drilling, punching, bending and all common welding processes for on-site assembly.

All pipes of one bundle from identical furnace with unified furnace number marking, traceable material test certificates.

5,000 tons monthly capacity, controllable short lead time for bulk export orders with flexible payment terms T/T & L/C.

• Construction & Steel Structure: Building columns, roof trusses, workshop frames, bridge auxiliary supports
• Mechanical Manufacturing: Equipment bases, conveyor racks, machinery protective frames
• Automobile Industry: Vehicle chassis, car frame structural components
• Shipbuilding & Offshore: Light ship structural parts, marine equipment supports
• Municipal Engineering: Traffic guardrail, street lamp pole, telecom antenna tower
• Agriculture & Irrigation: Greenhouse skeleton, breeding facility frames
• HVAC & Fire Protection: Pipeline brackets, fire system support frames
• Scaffolding & Cold Storage: Construction scaffold tubes, cold room structural frames

We provide integrated forging and precision machining services, and can produce finished components strictly according to customer drawings:
Turning, milling, planing, drilling, boring, grinding
Gear cutting, CNC precision machining
Sizing cutting, surface treatment and finishing

We have supplied a wide range of forged and machined parts including shafts, cylinders, hollow bars, pistons, tube sheets, rings and disc bearings to customers worldwide.

We have a professional QC inspection team and complete testing equipment to ensure stable and reliable product quality:
Ultrasonic testing (UT) for internal defects
Tensile and hardness testing for mechanical properties
High-precision dimensional measurement
Spectrometer for chemical composition verification
Metallographic microstructure inspection

Every batch of products undergoes strict inspection before delivery to meet the quality requirements of various engineering projects.

Inner packaging: waterproof polybag for moisture and dust protection
Outer packaging: reinforced wooden case / wooden pallet, suitable for long-distance international transportation
Custom packaging solutions available upon request
Extra protection: Plastic caps covered on both pipe ends to prevent collision damage; small sizes bundled by steel strips with uniform batch labels.

Normally 10 – 45 days after receipt of advance payment
Exact delivery time depends on order quantity, specification complexity and machining requirements
Standard fast production: Within 15 working days after receiving deposit or 100% Irrevocable L/C at sight