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China Rectangular Steel Pipe (RHS) - High-Quality Suppliers and Factory Direct Pricing
Detailed Description of Rectangular Steel Pipe (RHS)
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
| 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 × Side B) | e.g., 20×30mm, 40×60mm, 50×100mm, up to 400×600mm 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)
Q
What is the difference between RHS and SHS steel tubes?
RHS (Rectangular Hollow Section) has two different side dimensions (e.g., 50×100mm), while SHS (Square Hollow Section) has all four sides equal. RHS provides greater bending strength along its major axis, making it preferred for beams and directional load applications, whereas SHS offers uniform strength in all directions, making it ideal for columns and multi-directional load scenarios.
Q
What manufacturing standards are available for rectangular steel pipes?
Rectangular steel pipes are available under multiple international standards, including ASTM A500 (North America), EN10219 and EN10210 (Europe), JIS G3466 (Japan), and AS/NZS 1163 (Australia/New Zealand). Chinese standards such as Q235 and Q345 are also widely used. The appropriate standard depends on the project location and engineering requirements.
Q
What surface treatment options are available for RHS?
RHS can be supplied with various surface treatments to suit different environmental and application requirements. Options include black (bare/self-color), oiled for rust prevention during transit, hot-dip galvanized or pre-galvanized for outdoor corrosion resistance, and painted or powder coated for aesthetic or additional protective purposes.
Q
What sizes and wall thicknesses are commonly available for rectangular steel pipes?
Rectangular steel pipes are available in a wide range of sizes, from as small as 20×30mm up to 400×600mm or larger for heavy structural applications. Wall thickness typically ranges from 0.8mm to 25mm, depending on the section size and applicable standard. Custom sizes can also be produced to meet specific project requirements.
Q
What quality inspections are performed on rectangular steel pipes?
Standard quality inspections for RHS include dimensional checks (verifying section size, wall thickness, and straightness), tensile tests, yield strength measurement, elongation testing, weld integrity testing (for ERW-produced pipes), and chemical composition analysis. These tests ensure the product meets the specified standard and is safe for structural use.
Q
What are the typical applications of rectangular hollow sections (RHS)?
RHS is widely used in structural engineering and construction applications where load is primarily applied in one direction. Common uses include structural beams, support frames, industrial shelving, vehicle chassis and trailer frames, agricultural machinery, mezzanine floors, and architectural frameworks. Its high strength-to-weight ratio makes it an efficient and cost-effective choice for these applications.