Hollow Sections

Rectangular Steel Pipe / Rectangular Hollow Section (RHS)

High Bending Strength
Various Sizes
Industrial & Architectural

Rectangular Steel Pipe, commonly used in building structures, have similar cross-sectional characteristics to square tubes, but with significant differences in length and width dimensions. The sections are mainly manufactured by either cold-formed welded forming or hot-rolled forming, and RHS has excellent mechanical properties, with excellent bending stiffness and section strength, and its anisotropic mechanical properties make it particularly suitable for structural engineering applications where specific directional loads are required.

Quick Details

Parameter	Details
Product Name	Rectangular Steel Pipe (RHS)
Standard	ASTM A500, EN10219, EN10210, JIS G3466, AS/NZS 1163
Steel Grade	Q235, Q345, S235JR, S275J0H, S355J2H, STKR400, C250/C350
Size (Side A x Side B)	e.g., 20x30mm - 400x600mm
Wall Thickness	0.8mm - 25mm

product description

Specifications

Main Application

Advantages

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

Rectangular Steel Pipe Specifications (Illustrative Common Sizes)

Rectangular Steel Pipe
OD	WT	OD	WT	OD	WT
(mm)	(mm)	(mm)	(mm)	(mm)	(mm)
20*30	1.0-3.0	50*80	1.8-6.0	100*150	2.5-15.0
20*40	1.2-3.0	50*90	1.8-6.0	100*200	2.5-15.0
20*50	1.3-3.75	50-100	1.5-6.0	100*250	2.5-15.0
25*40	1.2-3.0	50*120	V ·5-6.0	100*300	3.0-15.0
25*50	1.2*5.0	60-80	1.3-6.0	100*400	11.5-13-5
30*40	1.2-3.0	60*90	1.5-6.0	150*200	2.5-15.0
30*50	1.2-5.0	60*100	1.5-6.0	150*250	3.0-15.0
30*60	1.2-6.0	60*120	V ·5-6.0	150*300	3.0-15.0
40*50	1.2-6.0	75*125	1.5-13.0	200*300	4·5-13·5
40*60	1.2-6.0	80*100	1.5-6.0	200*400	4-75-13.0
40*8o	1.3-6.0	80*120	1.5-13.0	300*400	5-75-13.0
40*100	、 ·3-6.0	80*140	2.5-15.0	300*500	6. 0-13.0
50*70	1.3-6.0	80*160	2.5-15.0	400*600	6.0-13.0

Main Application Areas for Rectangular Steel Pipe

Rectangular hollow sections have become an important material choice in the modern engineering field due to their excellent axial load bearing performance and wide application adaptability. Its typical application scenes include:

Architectural engineering field

Main structure: Widely used in frame structures, load-bearing columns, beams, truss systems and other key load-bearing parts of high-rise buildings, bridges and industrial plants.

Building decoration: used as exposed steel structure elements to create modern canopy systems, curtain wall support structures, etc.

Industrial Manufacturing

Heavy equipment: to form the main frame of all kinds of heavy machinery, conveying equipment support system.

Industrial facilities: used to build various industrial operation platforms and production auxiliary facilities.

Transportation

Vehicle manufacturing: used in commercial vehicle chassis structures, trailer frames, rail transit vehicle components, etc.

Commercial and civil field

Commercial display: modern furniture design, retail display systems, storage shelves, etc.

Infrastructure: road marking support system, new energy power generation equipment support, etc.

Customized Application

CORTEC STEEL LIMITED can can flexibly process all kinds of special structural parts and functional components according to the specific project requirements.

Advantages of Rectangular Steel Pipe

Rectangular steel tubes offer the following significant advantages:

Superior bending resistance

Demonstrates excellent bending resistance along the main axis, making it particularly suitable for structural applications subject to lateral loads.

Efficient material utilization

With an excellent strength-to-weight ratio, material utilization is optimized while maintaining structural strength, effectively reducing overall weight and cost.

Flexible Design Adaptability

By adjusting the cross-section size and wall thickness, differentiated strengths can be provided for different directional forces to meet the design requirements for specific loading conditions.

Aesthetically pleasing architectural performance

Simple geometric shapes with smooth surfaces and clear edges meet structural requirements and present modern architectural aesthetics.

Convenient Processing Characteristics

has good processability and supports welding, cutting, drilling and other processing methods, which is convenient for on-site construction and component connection.