Rectangular Steel Pipe
- Our rectangular steel pipes are manufactured from premium carbon steel, alloy steel and stainless steel, featuring precise dimensional tolerance and smooth surface. Multiple surface treatments including black, hot-dip galvanized and polished finishes are available, and we support customized outer dimensions and wall thicknesses. Adopting mature forming and welding technology, these rectangular tubes possess high structural rigidity. Every product undergoes professional straightening and comprehensive quality inspection to deliver stable mechanical performance. They are widely applied in construction engineering, machinery manufacturing, transportation facilities, metal furniture and marine related projects for global purchasers.
Certified
All rectangular steel pipes come with full factory test certificates including chemical composition, tensile test, hardness, dimensional inspection and hydrostatic pressure test. Compliant with ASTM, EN, DIN, JIS, ISO standards. EN 10204 3.1 / 3.2 mill certificates and third-party inspection documents are available upon request to realize full quality traceability for global buyers.
Application
Rectangular steel pipe is an indispensable hollow structural material for multiple industrial sectors. In construction engineering, it serves as building beams, columns, curtain wall supports, roof trusses and guardrail frames, featuring high bearing capacity and easy cutting & welding. Galvanized rectangular pipes are ideal for outdoor projects with excellent anti-rust performance.
Machinery manufacturing adopts rectangular pipes for equipment racks, conveyor brackets and machine chassis to reduce overall weight while maintaining structural stability. Automotive and trailer industries use them for vehicle frames, cargo compartment supports and undercarriage components.
Light thin-wall rectangular pipes are widely applied in furniture production for tables, chairs, storage racks and decorative frames. Stainless rectangular pipes are popular in food, pharmaceutical and offshore facilities, resisting corrosion from seawater and chemical media. In municipal engineering, they are used for municipal railings, greening supports and pipeline support frames.
Specification
1. Product Specification
Parameter | Detailed Specification |
Product Type | Black Rectangular Pipe, Galvanized Rectangular Pipe, Stainless Rectangular Pipe, Alloy Rectangular Pipe, Pickled Rectangular Pipe |
Size Range | 20×10mm – 600×400mm, customizable |
Wall Thickness | 0.8mm – 22mm, customizable |
Standard Length | 3m, 6m, 12m or customized fixed length |
Surface Treatment | Black hot rolled, cold rolled, galvanized, pickled, polished, anti-rust oil coated, painted |
Manufacturing Process | Raw Strip Slitting → Forming → High Frequency Welding → Weld Seam Cleaning → Sizing & Straightening → Fixed Length Cutting → Surface Treatment → NDT Inspection → Hydraulic Pressure Test → Dimension & Hardness Test → Anti-rust Coating → Marking & Labeling → Packing |
Applicable Standards | ASTM A500, ASTM A513, EN 10219, EN 10305, DIN 2391, JIS G3466, ISO |
Material Grades | Carbon Steel: Q195, Q235B, Q355B, S235JR, S355JR, A500 Grade BStainless Steel: 201, 304, 304L, 316, 316L, 321Alloy Steel: 16Mn, 4130, 4140 |
2. Chemical Composition
Grade | C | Si | Mn | P | S | Cr | Ni | Mo |
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 (wt%) | Key Mechanical Properties (Room Temperature) |
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% |
Austenitic Stainless Steel | 304 | ASTM A240 | C ≤0.08 Cr 18.0~20.0 Ni 8.0~10.5 | TS ≥520MPa YS ≥205MPa EL ≥35% |
Low Carbon 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
