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China Rectangular Steel Pipe Suppliers - Quality RHS from Reliable Factory for Construction and Structural Applications
Detailed Description of Rectangular Steel Pipe (RHS)
Overview
Rectangular Hollow Sections (RHS), or rectangular steel pipes, are structural grade tubes with a rectangular cross-section. Similar to SHS, they are most commonly produced by ERW (Electric Resistance Welding) from steel strip, which is first formed into a round tube and then profiled into a rectangular shape. Hot forming is also a manufacturing method. RHS offers high strength in relation to its weight, particularly in bending along its major axis, making it an efficient material for beams and columns where load is primarily in one direction.
Key Parameters for Rectangular Steel Pipe
Specifications at a Glance
| Parameter | Details |
|---|---|
| Manufacturing Process | ERW (Cold Formed or Hot Formed), Seamless (less common for RHS) |
| Standards | ASTM A500 (Gr. A, B, C, D), EN10219 (S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355K2H), EN10210 (S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355NH, S355NLH), JIS G3466 (STKR400, STKR490), AS/NZS 1163 (C250, C350, C450) |
| Steel Grade | Q195, Q235, Q345 (Chinese Standards); Gr. A, B, C, D (ASTM A500); S235, S275, S355 (EN Standards); STKR400, STKR490 (JIS) |
| Size (Side A x Side B) | e.g., 20x30mm, 40x60mm, 50x100mm, up to 400x600mm or larger |
| Wall Thickness (WT) | 0.8mm to 25mm (varies with size and standard) |
| Length | Usually 6m or 12m; can be customized |
| Corner Radius | Typically 2T to 3T (T = Wall Thickness), varies by standard |
| Surface Treatment | Black (bare/self-color), Oiled, Galvanized (Hot-dip or Pre-galvanized), Painted/Powder Coated |
| Inspection | Dimensional Check, Tensile Test, Yield Strength, Elongation, Weld Test (for ERW), Chemical Analysis |
Frequently Asked Questions (FAQ)
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What is a Rectangular Hollow Section (RHS) steel pipe?A Rectangular Hollow Section (RHS) is a structural steel tube with a rectangular cross-section. It is widely used in construction, engineering, and manufacturing due to its high strength-to-weight ratio and efficient load-bearing performance, especially in bending along its major axis.
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What manufacturing processes are used to produce RHS steel pipes?RHS steel pipes are most commonly manufactured using ERW (Electric Resistance Welding), where steel strip is first formed into a round tube and then shaped into a rectangular profile. Both cold-formed and hot-formed methods are available. Seamless production is less common for RHS.
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What international standards apply to rectangular steel pipes?Rectangular steel pipes are produced under several international standards, including ASTM A500 (USA), EN10219 and EN10210 (Europe), JIS G3466 (Japan), and AS/NZS 1163 (Australia/New Zealand). Each standard specifies different grades, mechanical properties, and dimensional tolerances.
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What sizes and wall thicknesses are available for RHS steel pipes?RHS steel pipes are available in a wide range of sizes, from as small as 20x30mm up to 400x600mm or larger. Wall thickness typically ranges from 0.8mm to 25mm, depending on the size and applicable standard. Custom sizes and lengths can also be arranged upon request.
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What surface treatment options are available for rectangular steel pipes?Common surface treatment options include black (bare/self-color), oiled, hot-dip galvanized, pre-galvanized, and painted or powder-coated finishes. The choice of surface treatment depends on the application environment and corrosion protection requirements.
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What quality inspections are performed on RHS steel pipes?Quality inspection for RHS steel pipes typically includes dimensional checks, tensile testing, yield strength measurement, elongation testing, weld integrity testing (for ERW pipes), and chemical composition analysis. These tests ensure the product meets the required standard and project specifications.