Square Steel Pipe
- Our square and rectangular steel pipes are manufactured from high-quality carbon steel, alloy steel and stainless steel, ensuring high tensile strength, excellent weldability and consistent dimensional accuracy. Products can be supplied in hot rolled, cold rolled, galvanized and black finishes. They are extensively adopted in construction, machinery manufacturing, transportation equipment, metal furniture and various structural engineering projects. We offer flexible customization on outer sizes, wall thicknesses and surface treatments. Strict quality control procedures are implemented throughout production to satisfy diverse technical demands of global buyers.
Certified
All square steel pipes are supplied with complete factory test certificates covering chemical composition, tensile strength, yield strength, elongation, hardness, dimensional tolerance and surface inspection. Our products comply with ISO, ASTM, EN, DIN and JIS standards. EN 10204 3.1/3.2 mill certificates and third-party inspection documents are available on request, ensuring full quality traceability for worldwide buyers.
Application
Square and rectangular steel pipes are essential structural materials in modern metal manufacturing and construction industries.
In building construction, they are widely used as structural columns, beams, door and window frames, curtain wall supports, roof trusses and steel framing systems. Their uniform section shape provides excellent load-bearing capacity and facilitates fast installation.
In the machinery industry, square steel pipes are used to manufacture equipment frames, conveyor supports, workbenches, tool boxes and chassis components. Their high rigidity helps reduce deformation under heavy loads.
The transportation sector uses them for vehicle frames, trailer bodies, container parts, railings and undercarriage structures. Galvanized square pipes are especially suitable for outdoor and coastal applications due to their good corrosion resistance.
In furniture production, thin-wall square pipes are commonly used for tables, chairs, beds, shelves and display racks. Stainless steel square pipes are preferred for food processing, pharmaceutical, marine and decorative applications where hygiene, corrosion resistance and appearance quality are important.
Specification
1. Product Specification
Parameter | Detailed Specification |
Product Type | Black Square Steel Pipe, Galvanized Square Steel Pipe, Stainless Steel Square Pipe, Alloy Steel Square Pipe, Rectangular Steel Pipe |
Section Shape | Square / Rectangular |
Size Range | 10x10mm – 500x500mm, customizable |
Wall Thickness | 0.8mm – 20mm, customizable |
Length | 3m, 6m, 12m or customized |
Surface Treatment | Black, Galvanized, Cold Rolled, Polished, Pickled, Anti-rust Coated, Painted |
Manufacturing Process | Raw Material Preparation → Strip Slitting / Plate Cutting → Forming → Welding → Seam Cleaning → Sizing → Straightening → Cutting → Surface Treatment → Inspection → Packing |
Applicable Standards | ASTM A500, ASTM A513, EN 10219, EN 10305, DIN 2391, JIS G3466, ISO |
Material Grades | Carbon Steel: Q195, Q235B, Q355B, SPHC, SPCC, DC01, S235JR, S355JR / Stainless Steel: 201, 304, 304L, 316, 316L / Alloy Steel: 4130, 4140, 16Mn |
2. Chemical Composition
Grade | C | Si | Mn | P | S | Cr | Ni | Cu |
Q195 | ≤0.06 | ≤0.30 | ≤0.50 | ≤0.045 | ≤0.050 | - | - | - |
Q235B | ≤0.20 | ≤0.35 | ≤1.40 | ≤0.045 | ≤0.050 | - | - | - |
Q355B | ≤0.20 | ≤0.50 | 1.00–1.60 | ≤0.035 | ≤0.035 | - | - | - |
S235JR | ≤0.17 | ≤0.35 | ≤1.40 | ≤0.040 | ≤0.040 | - | - | - |
S355JR | ≤0.24 | ≤0.55 | 0.90–1.60 | ≤0.035 | ≤0.035 | - | - | - |
304 | ≤0.08 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.00–10.5 | - |
316L | ≤0.03 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.00–3.00 |
Standard
Classification | Grade | Applicable Standard | Key Chemical Composition | Key Mechanical Properties |
Carbon Structural Steel | Q195 | GB/T 700 | C ≤0.06 Mn ≤0.50 S ≤0.050 P ≤0.045 | TS ≥315MPa YS ≥195MPa EL ≥33% |
Carbon Structural Steel | Q235B | GB/T 700 | C ≤0.20 Mn ≤1.40 S ≤0.050 P ≤0.045 | TS ≥370MPa YS ≥235MPa EL ≥26% |
High Strength Structural Steel | Q355B | GB/T 1591 | C ≤0.20 Mn 1.00–1.60 S ≤0.035 P ≤0.035 | TS ≥470MPa YS ≥355MPa EL ≥21% |
European Structural Steel | S235JR | EN 10025-2 | C ≤0.17 Mn ≤1.40 S ≤0.040 P ≤0.040 | TS 360–510MPa YS ≥235MPa EL ≥26% |
European Structural Steel | S355JR | EN 10025-2 | C ≤0.24 Mn 0.90–1.60 S ≤0.035 P ≤0.035 | TS 470–630MPa YS ≥355MPa EL ≥22% |
Stainless Steel | 304 | ASTM A240 | C ≤0.08 Cr 18.0–20.0 Ni 8.0–10.5 | TS ≥520MPa YS ≥205MPa EL ≥35% |
Stainless Steel | 316L | ASTM A240 | C ≤0.03 Cr 16.0–18.0 Ni 10.0–14.0 Mo 2.0–3.0 | TS ≥480MPa YS ≥170MPa EL ≥40% |
Process
Packing
