Hot Products
Rectangular Steel Pipe (RHS) from China - Reliable Suppliers & Factory for Quality Structural Steel Solutions
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 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)
Q
What is the difference between RHS and SHS steel sections?
A
RHS (Rectangular Hollow Section) has two different side dimensions (e.g., 50x100mm), while SHS (Square Hollow Section) has equal side dimensions on all four faces. RHS is particularly advantageous for beams and directional load-bearing applications due to its higher bending strength along the major axis, whereas SHS provides uniform strength in multiple directions.
Q
What manufacturing standards are available for rectangular steel pipes?
A
Rectangular steel pipes can be manufactured to a wide range of international standards including ASTM A500 (North America), EN10219 and EN10210 (Europe), JIS G3466 (Japan), and AS/NZS 1163 (Australia/New Zealand). The choice of standard depends on the project location, engineering requirements, and applicable building codes.
Q
What surface treatment options are available for RHS?
A
RHS is available in several surface finishes to suit different environments and applications: Black (bare/self-color) for general structural use, Oiled for short-term corrosion protection, Hot-dip Galvanized or Pre-galvanized for long-term outdoor corrosion resistance, and Painted or Powder Coated for decorative or enhanced protective purposes.
Q
What wall thickness range is typically available for rectangular hollow sections?
A
Wall thickness for RHS typically ranges from 0.8mm on the lighter end up to 25mm for heavy structural sections. The available wall thickness varies depending on the overall size of the section and the applicable manufacturing standard. Custom wall thicknesses can also be arranged for specific project requirements.
Q
Can rectangular steel pipes be customized in length?
A
Yes. While standard lengths of 6 meters and 12 meters are the most commonly stocked options, rectangular steel pipes can be supplied in custom lengths to meet specific project needs. Custom cutting and length tolerances can be arranged with the manufacturer or supplier, subject to minimum order quantities.
Q
What quality inspections are performed on RHS products?
A
Quality control for rectangular hollow sections typically includes dimensional checks (verifying outer dimensions, wall thickness, and straightness), mechanical testing such as tensile strength, yield strength, and elongation tests, weld integrity testing for ERW-produced sections, and chemical composition analysis to ensure compliance with the specified steel grade and standard.