What Is a Rectangular Hollow Section?
A Rectangular Hollow Section (RHS) is a hollow steel section with a rectangular cross-section, commonly used in structural and fabrication applications. Compared with other hollow sections, RHS provides flat surfaces that are convenient for connections, welding, and frame construction.
RHS vs. SHS vs. CHS
| Section | Shape | Typical Use |
| RHS | Rectangular | Beams, columns, frames |
| SHS | Square | Columns, frames |
| CHS | Circular | Columns, structural supports |
RHS = Rectangular Hollow Section. Depending on the market, it may also be referred to as a rectangular steel tube or rectangular hollow section steel pipe.
How to Compare Rectangular Hollow Section Pipe Manufacturers in China
| Comparison Factor | What Buyers Should Check |
| Manufacturing capability | ERW production, forming and sizing |
| Product range | RHS sizes, wall thickness and lengths |
| Steel grades | Q235/Q355, S235/S355, ASTM grades |
| Standards | GB, EN, ASTM, JIS |
| Surface treatment | Black, galvanized, painted |
| Quality control | Weld, dimensional and mechanical testing |
| Customization | Non-standard sizes and project requirements |
| Production capacity | Annual output and delivery capability |
| Export experience | International projects and documentation |
| One-stop supply | Pipe manufacturing + coating + inspection |
Top Rectangular Hollow Section Pipe Manufacturers in China
China has a large number of rectangular hollow section (RHS) manufacturers, but their capabilities are not identical. Buyers should compare not only RHS specifications and prices, but also manufacturing processes, applicable standards, size range, surface treatment, quality control, and the ability to supply other steel pipe products for the same project.
The following manufacturers represent different strengths in the Chinese RHS market.
Cangzhou Spiral Steel Pipe (Group) Co., Ltd. focuses on SSAW, LSAW, ERW and seamless steel pipes, as well as 3PE-coated, galvanized and casing pipes. Its product portfolio primarily serves oil and gas transportation, water transmission and infrastructure projects, with a stronger emphasis on pipeline products than on rectangular hollow sections.
Jiafang Group specializes in large-diameter LSAW and SSAW steel pipes for oil and gas transmission, offshore engineering, water transportation and structural applications. Its product range is more focused on heavy-duty pipeline and infrastructure requirements than on rectangular hollow sections.
Hebei Allland Steel Pipe Manufacturing Co., Ltd. is a China-based steel pipe manufacturer offering rectangular and square hollow sections alongside a broader range of ERW, LSAW, SSAW and seamless steel pipes.
Its structural pipe range includes square and rectangular sections, with products available to standards such as ASTM A500, EN 10219, JIS G3466, GB/T 6728 and AS/NZS 1163. ALLLAND also provides surface treatments including hot-dip galvanizing, primer and other protective coatings.
Rectangular Hollow Section Manufacturer Comparison
The following table compares three China-based RHS manufacturers across product range, applicable standards, manufacturing capabilities, and project supply options.
| Comparison Factor | Cangzhou Spiral Steel Pipe (Group) Co., Ltd. | Jiafang Group | ALLLAND |
|---|---|---|---|
| Core Product Focus | Pipeline steel pipes | Large-diameter welded steel pipes | Structural sections and industrial steel pipes |
| Rectangular Hollow Sections | Not a core product focus | Not a core product focus | Square and rectangular hollow sections |
| Main Manufacturing Processes | SSAW / LSAW / ERW / Seamless | LSAW / SSAW | ERW / LSAW / SSAW / SMLS |
| Typical Applications | Oil and gas transmission, water pipelines, infrastructure | Oil and gas transmission, offshore engineering, infrastructure | Structural projects, pipeline transportation, industrial applications |
| Structural Steel Standards | Pipeline-oriented product portfolio | Pipeline-oriented product portfolio | ASTM A500 / EN 10219 / JIS G3466 / GB/T 6728 / AS/NZS 1163 |
| Anti-Corrosion Solutions | 3PE and other protective coatings | Anti-corrosion coatings | 3PE / 3LPE / FBE / HDG / Primer |
| Product Customization | Project-specific pipeline requirements | Project-specific pipeline requirements | Customizable product specifications and coating options |
| Multi-Product Procurement | Focused on pipeline products | Focused on large-diameter welded pipes | Structural sections + multiple steel pipe types + coatings |
RHS Size and Wall Thickness
RHS dimensions vary between manufacturers, so buyers should compare more than the maximum section size.
For example, ALLLAND’s structural pipe range covers square and rectangular sections, with customizable lengths and multiple international standards.
Its structural pipe product page lists square/rectangular sections from 20 × 20 mm to 500 × 500 mm and wall thicknesses from 1.0 to 50 mm across its broader structural pipe range.
For an RHS purchase, the important parameters include:
| Parameter | What Buyers Should Check |
| Section Size | Width × height |
| Wall Thickness | Required structural capacity |
| Length | Standard or project-specific |
| Steel Grade | Yield and tensile requirements |
| Standard | EN, ASTM, JIS, GB, etc. |
| Surface | Black, galvanized or coated |
| End Treatment | Plain, beveled or customized |
For a complete breakdown of available dimensions, wall thicknesses, and other technical specifications, see the [ALLLAND RHS size and specification table].
Maximum dimensions alone should not be used to rank suppliers. The actual requirement should be matched against the manufacturer’s available production process, steel grade and applicable standard.
Why ALLLAND Stands Out Among China RHS Suppliers
ALLLAND differs from suppliers focused primarily on rectangular hollow sections through its broader steel pipe manufacturing and coating capabilities. The main differences are in product coverage, production processes, coating options, and project supply.
Multiple Manufacturing Processes for RHS Pipe
ALLLAND manufactures RHS, ERW, LSAW and SSAW steel pipes, supporting projects with multiple pipe requirements.
Integrated Coating Options for RHS
Available coating solutions include 3PE, 3LPE, 3LPP, FBE and galvanized coatings, alongside pipe manufacturing.
Black RHS vs. Galvanized RHS
| Factor | Black RHS | Galvanized RHS |
| Corrosion resistance | Limited | Higher |
| Outdoor use | △ | ✓ |
| Maintenance | Higher | Lower |
| Cost | Lower | Higher |
ALLLAND’s structural pipe offering includes hot-dip galvanized, primer-coated, pre-painted and sandblasted surface options.
International Standards for RHS Pipe
RHS products can be supplied to EN 10219, EN 10210, ASTM A500 and GOST requirements, with customized specifications available.
| Standard | Common Grades | Typical Application |
| ASTM A500 | Grade B, C | Structural applications |
| EN 10219 | S235, S275, S355 | Structural hollow sections |
| EN 10210 | S235, S275, S355 | Hot-finished sections |
| JIS G3466 | STKR grades | Structural applications |
| GB/T 6728 | Q235, Q355 | Structural applications |
Quality Control for Rectangular Hollow Sections
ALLLAND provides dimensional, mechanical, chemical and weld inspection, with MTC and third-party inspection available for applicable orders.
Which China RHS Manufacturer Is Best for Your Project?
The right rectangular hollow section (RHS) manufacturer depends on your required dimensions, steel grade, applicable standards, surface treatment, and project scope. Buyers should evaluate technical compliance and manufacturing capabilities alongside price to ensure the products meet project requirements.
| Project Requirement | Key Selection Criteria |
|---|---|
| Standard RHS procurement | Section dimensions, wall thickness, steel grade and price |
| Galvanized RHS | Zinc coating requirements, coating uniformity and surface quality |
| Structural applications | Mechanical properties, dimensional tolerances and applicable standards |
| Multiple steel pipe specifications | Manufacturing processes, product range and specification flexibility |
| EPC and infrastructure projects | Quality inspection, coating capabilities, material traceability and delivery coordination |
For projects requiring RHS alongside ERW, LSAW, SSAW or seamless steel pipes, selecting a manufacturer with multiple production capabilities can simplify supplier coordination and procurement.
ALLLAND supplies square and rectangular hollow sections alongside multiple steel pipe types and protective coating options. This product portfolio makes it a suitable option for buyers seeking to consolidate structural steel and pipeline product sourcing through one manufacturer, subject to project specifications and availability.
Before placing an order, confirm the required dimensions, steel grade, applicable standards, coating system, inspection requirements and delivery schedule.
FAQ
What is the difference between RHS and SHS?
RHS has a rectangular cross-section, while SHS has a square cross-section. Both are commonly used as structural hollow sections, but their dimensions and applications differ.
Which standards are commonly used for RHS?
Common RHS standards include ASTM A500, EN 10219, EN 10210, JIS G3466 and GB/T 6728. The applicable standard depends on the project, market and required mechanical properties.
Can RHS be galvanized?
Yes. RHS can be supplied with hot-dip galvanized surfaces for applications requiring additional corrosion protection, particularly in outdoor or exposed environments.
