Introduction

Square Steel Pipe and Rectangular Steel Pipe, collectively known as Hollow Sections (SHS & RHS), are manufactured from strip steel through processing and rolling. The production process typically involves uncoiling, leveling, crimping, and welding the strip into a round tube, which is then roll-formed into a square or rectangular shape and cut to the required length.

Compared with solid bars, hollow sections offer superior strength-to-weight ratios, enabling lighter and more economical structural designs. With smooth surfaces, precise dimensional tolerances, and excellent weldability, our square and rectangular steel pipes adapt to a wide range of structural and mechanical applications. We offer SHS sizes from 10×10 mm to 500×500 mm, RHS sizes from 10×20 mm to 600×400 mm, customizable wall thicknesses of 0.5–40.0 mm, and lengths up to 18 meters. Multiple surface finishes including hot-rolled, cold-rolled, and hot-dip galvanized are available.

Product Name	Executive Standard	Dimension	Steel Grade
Square Hollow Section (SHS)	ASTM A500 / A500M	10×10 – 500×500 mm	Grade A, B, C, D
	EN 10219	WT: 2.0 – 16.0 mm	S235JRH – S355K2H
	EN 10210		S235, S355, S355J2H
	JIS G 3466		STKR 400, STKR 490
	GB/T 6728		Q195, Q215, Q235, Q345
Rectangular Hollow Section (RHS)	ASTM A500 / A500M	10×20 – 600×400 mm	Grade A, B, C, D
	EN 10219	WT: 2.0 – 16.0 mm	S235JRH – S355K2H
	EN 10210		S235, S355, S355J2H
	JIS G 3466		STKR 400, STKR 490
	GB/T 6728		Q195, Q215, Q235, Q345
Mechanical Tubing	ASTM A513	10×10 – 500×500 mm	1008, 1010, 1020-1026

Specs & Sizes

Here are the detailed size charts for Square Steel Pipe (SHS) and Rectangular Steel Pipe (RHS) , organized by standard and unit system.

Square Steel Pipe (SHS) Size Chart
1. Metric Sizes – EN 10210 / EN 10219 (Cold-Formed & Hot-Finished)
Square hollow sections are designated by outside width × wall thickness (e.g., SHS 50×4). Standard sizes range from 20×20 mm to 400×400 mm.

Designation	Width (mm)	Thickness (mm)	Approx. Weight (kg/m)	Area (cm²)
SHS 20×2	20	2.0	1.11	1.40
SHS 20×2.5	20	2.5	1.32	1.68
SHS 25×2	25	2.0	1.43	1.80
SHS 25×2.5	25	2.5	1.74	2.18
SHS 25×3	25	3.0	2.04	2.54
SHS 30×2	30	2.0	1.74	2.20
SHS 30×2.5	30	2.5	2.14	2.68
SHS 30×3	30	3.0	2.51	3.14
SHS 40×2.5	40	2.5	2.92	3.68
SHS 40×3	40	3.0	3.45	4.34
SHS 40×3.2	40	3.2	3.61	4.60
SHS 50×3	50	3.0	4.36	5.55
SHS 50×4	50	4.0	5.50	7.36
SHS 60×3	60	3.0	5.19	—
SHS 60×4	60	4.0	6.71	—
SHS 60×5	60	5.0	8.13	—
SHS 80×3	80	3.0	7.07	—
SHS 80×5	80	5.0	11.30	—
SHS 100×4	100	4.0	11.70	—
SHS 100×6	100	6.0	16.90	—
SHS 100×8	100	8.0	21.70	—
SHS 150×6	150	6.0	26.40	—
SHS 150×10	150	10.0	40.90	56.00
SHS 200×8	200	8.0	46.80	—
SHS 200×12	200	12.0	67.50	—
SHS 250×10	250	10.0	73.00	—
SHS 300×8	300	8.0	71.80	—

Wall thickness availability: 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 4.0 mm, 5.0 mm, 6.0 mm, 6.3 mm, and above.

2. Imperial Sizes – ASTM A500 (North American Standard)
Imperial square tubes are specified by outside dimensions in inches. ASTM A500 covers sizes up to a maximum perimeter of 88 inches (approx. 22×22 inches for square shapes).

Size (in)	Wall Thickness (in)	Nominal Weight (lbs/ft)	Standard Lengths (ft)
½" × ½"	0.063	0.38	20 / 24
1" × 1"	0.065 (16 ga)	0.81	20 / 24
1" × 1"	0.120 (11 ga)	1.36	20 / 24
1-½" × 1-½"	0.065 (16 ga)	1.26	20 / 24
1-½" × 1-½"	0.120 (11 ga)	2.17	20 / 24
1-½" × 1-½"	0.188 (3/16")	3.05	20 / 24
2" × 2"	0.065 (16 ga)	1.70	20 / 24
2" × 2"	0.120 (11 ga)	2.99	20 / 24
2" × 2"	0.188 (3/16")	4.32	20 / 24
2" × 2"	0.250 (1/4")	5.41	20 / 24 / 40
3" × 3"	0.120 (11 ga)	4.62	20 / 24 / 40
3" × 3"	0.188 (3/16")	6.87	20 / 24 / 40
3" × 3"	0.250 (1/4")	8.81	20 / 24 / 40
3" × 3"	0.375 (3/8")	12.16	20 / 24 / 40
4" × 4"	0.128 (1/8")	6.46	20 / 24 / 40
4" × 4"	0.188 (3/16")	9.42	20 / 24 / 40
4" × 4"	0.250 (1/4")	12.21	20 / 24 / 40
4" × 4"	0.375 (3/8")	17.27	20 / 24 / 40 / 48
4" × 4"	0.500 (1/2")	21.63	20 / 24 / 40 / 48
6" × 6"	0.188 (3/16")	14.53	20 / 24 / 40 / 48
6" × 6"	0.250 (1/4")	19.02	20 / 24 / 40 / 48
6" × 6"	0.375 (3/8")	27.48	20 / 24 / 40 / 48
6" × 6"	0.500 (1/2")	35.24	20 / 24 / 40 / 48
8" × 8"	0.250 (1/4")	—	20 / 24 / 40 / 48
8" × 8"	0.375 (3/8")	—	20 / 24 / 40 / 48
8" × 8"	0.500 (1/2")	—	20 / 24 / 40 / 48

Standard lengths: 20 ft, 24 ft, 40 ft, 48 ft.

Rectangular Steel Pipe (RHS) Size Chart
1. Metric Sizes – EN 10210 / EN 10219 (Cold-Formed & Hot-Finished)
Rectangular hollow sections are designated by width × depth × wall thickness (e.g., RHS 100×50×4). Standard sizes typically range from 40×20 mm to 400×200 mm.

Designation	Width (mm)	Depth (mm)	Thickness (mm)	Approx. Weight (kg/m)	Area (cm²)
RHS 50×25×2.5	50	25	2.5	2.69	3.43
RHS 50×25×3	50	25	3.0	3.17	4.04
RHS 50×30×2.5	50	30	2.5	2.89	3.68
RHS 50×30×3	50	30	3.0	3.41	4.34
RHS 50×30×3.2	50	30	3.2	3.61	4.60
RHS 50×30×4	50	30	4.0	4.39	5.59
RHS 50×30×5	50	30	5.0	5.28	6.73
RHS 60×40×2.5	60	40	2.5	3.68	4.68
RHS 60×40×3	60	40	3.0	4.35	5.54
RHS 80×40×3	80	40	3.0	5.29	6.74
RHS 100×50×4	100	50	4.0	8.87	11.30
RHS 120×60×5	120	60	5.0	13.30	—
RHS 150×50×6	150	50	6.0	—	—
RHS 200×100×5	200	100	5.0	22.00	29.00
RHS 200×100×12.5	200	100	12.5	53.40	—

Wall thickness availability: 1.6 mm – 16.0 mm.

2. Imperial Sizes – ASTM A500
Rectangular tubes are specified by outside width × depth in inches.

Size (in)	Wall Thickness (in)	Standard Lengths (ft)
8" × 6"	0.250 – 0.500	30, 34, 48
10" × 6"	0.250 – 0.500	30, 34, 48
12" × 6"	0.250 – 0.500	30, 34, 48
12" × 8"	0.250 – 0.500	30, 34, 48
14" × 8"	0.250 – 0.500	30, 34, 48
16" × 8"	0.250 – 0.500	30, 34, 48

Material Properties

Below are standard technical tables for square and rectangular steel pipes, covering chemical composition and tensile mechanical properties. All data complies with ASTM and EN standards for each steel grade. Chemical composition defines element content ranges to guarantee weldability, formability, and material purity. Tensile data shows standardized strength and elongation values, ensuring reliable mechanical performance, structural integrity, and load-bearing capacity. All technical indicators are traceable and support third-party inspection for industrial high-standard applications.

Chemical Requirements (%) – ASTM A500

Grade	C, max	Mn, max	P, max	S, max	Cu, min
Grade A	0.26	1.35	0.035	0.035	0.20
Grade B	0.26	1.35	0.035	0.035	0.20
Grade C	0.23	1.35	0.035	0.035	0.20
Grade D	0.26	1.35	0.035	0.035	0.20

Chemical Requirements (%) – EN 10219

Steel Grade	C, max	Si, max	Mn, max	P, max	S, max	N, max
S235JRH	0.17	—	1.40	0.040	0.040	0.012
S275J0H	0.20	—	1.50	0.035	0.035	0.012
S355J0H	0.22	0.55	1.60	0.035	0.035	0.012
S355J2H	0.22	0.55	1.60	0.035	0.035	0.012

Tensile Requirements – ASTM A500 (Shaped Structural Tubing)

Grade	Tensile Strength, min ksi [MPa]	Yield Strength, min ksi [MPa]	Elongation, min %
Grade A	45,000 [310]	39,000 [269]	25
Grade B	58,000 [400]	46,000 [317]	23
Grade C	62,000 [427]	50,000 [345]	21
Grade D	58,000 [400]	36,000 [250]	23

Tensile Requirements – EN 10219

Grade	Yield Strength, min MPa	Tensile Strength, MPa	Elongation, min %	Impact Test
S235JRH	235	360–510	20	27J @ +20°C
S275J0H	275	430–580	20	27J @ 0°C
S275J2H	275	430–580	20	27J @ -20°C
S355J0H	355	510–680	20	27J @ 0°C
S355J2H	355	510–680	20	27J @ -20°C
S355K2H	355	510–680	20	40J @ -30°C

Process & Finishing

Square and rectangular steel pipes are primarily manufactured by cold-forming processes using high-frequency electric resistance welding (ERW), or alternatively by TIG welding. The complete standardized production process includes raw material preparation, roll-forming, welding, sizing, surface treatment, and rigorous quality inspection, ensuring dimensionally stable, high-strength and corrosion-resistant pipes compliant with international standards.

Raw Material Preparation: Premium hot-rolled or cold-rolled steel coils are selected and processed by uncoiling, leveling, and edge trimming to ensure stable forming quality.

Roll-Forming & Welding: Strip steel is progressively formed through multiple forming rolls into a round tube, then welded by high-frequency ERW or TIG. The welded tube is then passed through sizing rolls to achieve the final square or rectangular shape.

Heat Treatment & Straightening: Post-weld heat treatment and straightening are applied to relieve residual stress, optimize internal microstructure, and meet structural and mechanical engineering standards.

Surface Finishing: Available finishes include hot-rolled, cold-rolled, lightly oiled, hot-dip galvanized, and electro-galvanized. Hot-dip galvanizing provides superior corrosion protection for outdoor and marine applications.

Cutting & End Finishing: Pipes are cut to precise lengths with square-cut ends and burrs removed, ready for installation.

Quality Inspection & Packaging: Finished pipes undergo strict NDT flaw detection, tensile testing, and manual screening. Only fully qualified products are packaged and delivered to ensure stable and reliable performance.

Test & QC

All square and rectangular steel pipes are manufactured in strict accordance with official industry standards and undergo comprehensive systematic testing before shipment, ensuring zero potential defects and complete structural integrity for industrial use.

Tensile Testing is implemented as a mandatory full-inspection procedure. This core test verifies that each finished pipe fully meets specification requirements for yield strength, tensile strength, and elongation.

Flattening Test ensures ductility and sound weld quality of the finished product.

Chemical Composition Analysis guarantees material purity and compliance with grade specifications.

After passing all quality tests, pipes undergo customized finishing and standardized packaging. Available processing includes precision straightening, custom fixed-length cutting, and professional surface treatments. Products can be bundled with steel strips, wrapped in waterproof paper, or packed in PVC sleeves and sackcloth. Each product is clearly stenciled with complete batch and manufacturing information, realizing full lot traceability and ensuring reliable, traceable product quality.

FAQ

Q1: What is the difference between square steel pipe and rectangular steel pipe?

Square steel pipe (SHS) has equal side lengths, while rectangular steel pipe (RHS) has unequal side lengths. Both are hollow structural sections used in construction, mechanical, and engineering applications. The choice depends on specific load requirements and design constraints.

Q2: What are the advantages of hollow sections over solid bars?

Hollow sections offer superior strength-to-weight ratios, providing equivalent load-bearing capacity with significantly less material weight. This results in lighter structures, reduced foundation requirements, and lower transportation and installation costs.

Q3: What is the difference between cold-formed (EN 10219) and hot-finished (EN 10210) hollow sections?

Cold-formed hollow sections (EN 10219) are manufactured from coil at room temperature with ERW welding, offering tighter tolerances, smoother surfaces, and lower cost. Hot-finished sections (EN 10210) are heat-treated after forming, providing better toughness and stress-relief, making them ideal for welding, seismic zones, and low-temperature applications.

Q4: Why are hollow sections suitable for building construction?

Square and rectangular hollow sections provide excellent structural stability, uniform load distribution, and high strength-to-weight ratios. Their clean aesthetic appearance and ease of connection make them ideal for columns, beams, roof trusses, and architectural frameworks.

Q5: What are the anti-corrosion options for hollow sections?

Available surface treatments include hot-dip galvanizing, electro-galvanizing, and oiling. Hot-dip galvanizing provides superior corrosion protection for outdoor, marine, and aggressive environmental applications.

Q6: Can hollow sections be custom-made to specific sizes?

Yes. We offer custom sizes beyond standard specifications, with dimensions tailored to customer requirements. Custom wall thicknesses, lengths, and surface finishes are available upon request.

Q7: What quality certifications are provided?

All products are supplied with Mill Test Certificates in accordance with EN 10204/3.1B. Full third-party inspection certification reports can be provided upon request.

Q8: In which scenarios are hollow sections irreplaceable?

Square and rectangular hollow sections are irreplaceable for building structural frameworks, bridge construction, crane building, mechanical engineering, and furniture design. Their unique combination of high strength, light weight, and aesthetic appeal cannot be matched by other steel profiles in these applications.

Here are the detailed size charts for Square Steel Pipe (SHS) and Rectangular Steel Pipe (RHS) , organized by standard and unit system.

Square Steel Pipe (SHS) Size Chart
1. Metric Sizes – EN 10210 / EN 10219 (Cold-Formed & Hot-Finished)
Square hollow sections are designated by outside width × wall thickness (e.g., SHS 50×4). Standard sizes range from 20×20 mm to 400×400 mm.

Designation	Width (mm)	Thickness (mm)	Approx. Weight (kg/m)	Area (cm²)
SHS 20×2	20	2.0	1.11	1.40
SHS 20×2.5	20	2.5	1.32	1.68
SHS 25×2	25	2.0	1.43	1.80
SHS 25×2.5	25	2.5	1.74	2.18
SHS 25×3	25	3.0	2.04	2.54
SHS 30×2	30	2.0	1.74	2.20
SHS 30×2.5	30	2.5	2.14	2.68
SHS 30×3	30	3.0	2.51	3.14
SHS 40×2.5	40	2.5	2.92	3.68
SHS 40×3	40	3.0	3.45	4.34
SHS 40×3.2	40	3.2	3.61	4.60
SHS 50×3	50	3.0	4.36	5.55
SHS 50×4	50	4.0	5.50	7.36
SHS 60×3	60	3.0	5.19	—
SHS 60×4	60	4.0	6.71	—
SHS 60×5	60	5.0	8.13	—
SHS 80×3	80	3.0	7.07	—
SHS 80×5	80	5.0	11.30	—
SHS 100×4	100	4.0	11.70	—
SHS 100×6	100	6.0	16.90	—
SHS 100×8	100	8.0	21.70	—
SHS 150×6	150	6.0	26.40	—
SHS 150×10	150	10.0	40.90	56.00
SHS 200×8	200	8.0	46.80	—
SHS 200×12	200	12.0	67.50	—
SHS 250×10	250	10.0	73.00	—
SHS 300×8	300	8.0	71.80	—

Wall thickness availability: 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 4.0 mm, 5.0 mm, 6.0 mm, 6.3 mm, and above.

2. Imperial Sizes – ASTM A500 (North American Standard)
Imperial square tubes are specified by outside dimensions in inches. ASTM A500 covers sizes up to a maximum perimeter of 88 inches (approx. 22×22 inches for square shapes).

Size (in)	Wall Thickness (in)	Nominal Weight (lbs/ft)	Standard Lengths (ft)
½" × ½"	0.063	0.38	20 / 24
1" × 1"	0.065 (16 ga)	0.81	20 / 24
1" × 1"	0.120 (11 ga)	1.36	20 / 24
1-½" × 1-½"	0.065 (16 ga)	1.26	20 / 24
1-½" × 1-½"	0.120 (11 ga)	2.17	20 / 24
1-½" × 1-½"	0.188 (3/16")	3.05	20 / 24
2" × 2"	0.065 (16 ga)	1.70	20 / 24
2" × 2"	0.120 (11 ga)	2.99	20 / 24
2" × 2"	0.188 (3/16")	4.32	20 / 24
2" × 2"	0.250 (1/4")	5.41	20 / 24 / 40
3" × 3"	0.120 (11 ga)	4.62	20 / 24 / 40
3" × 3"	0.188 (3/16")	6.87	20 / 24 / 40
3" × 3"	0.250 (1/4")	8.81	20 / 24 / 40
3" × 3"	0.375 (3/8")	12.16	20 / 24 / 40
4" × 4"	0.128 (1/8")	6.46	20 / 24 / 40
4" × 4"	0.188 (3/16")	9.42	20 / 24 / 40
4" × 4"	0.250 (1/4")	12.21	20 / 24 / 40
4" × 4"	0.375 (3/8")	17.27	20 / 24 / 40 / 48
4" × 4"	0.500 (1/2")	21.63	20 / 24 / 40 / 48
6" × 6"	0.188 (3/16")	14.53	20 / 24 / 40 / 48
6" × 6"	0.250 (1/4")	19.02	20 / 24 / 40 / 48
6" × 6"	0.375 (3/8")	27.48	20 / 24 / 40 / 48
6" × 6"	0.500 (1/2")	35.24	20 / 24 / 40 / 48
8" × 8"	0.250 (1/4")	—	20 / 24 / 40 / 48
8" × 8"	0.375 (3/8")	—	20 / 24 / 40 / 48
8" × 8"	0.500 (1/2")	—	20 / 24 / 40 / 48

Standard lengths: 20 ft, 24 ft, 40 ft, 48 ft.

Rectangular Steel Pipe (RHS) Size Chart
1. Metric Sizes – EN 10210 / EN 10219 (Cold-Formed & Hot-Finished)
Rectangular hollow sections are designated by width × depth × wall thickness (e.g., RHS 100×50×4). Standard sizes typically range from 40×20 mm to 400×200 mm.

Designation	Width (mm)	Depth (mm)	Thickness (mm)	Approx. Weight (kg/m)	Area (cm²)
RHS 50×25×2.5	50	25	2.5	2.69	3.43
RHS 50×25×3	50	25	3.0	3.17	4.04
RHS 50×30×2.5	50	30	2.5	2.89	3.68
RHS 50×30×3	50	30	3.0	3.41	4.34
RHS 50×30×3.2	50	30	3.2	3.61	4.60
RHS 50×30×4	50	30	4.0	4.39	5.59
RHS 50×30×5	50	30	5.0	5.28	6.73
RHS 60×40×2.5	60	40	2.5	3.68	4.68
RHS 60×40×3	60	40	3.0	4.35	5.54
RHS 80×40×3	80	40	3.0	5.29	6.74
RHS 100×50×4	100	50	4.0	8.87	11.30
RHS 120×60×5	120	60	5.0	13.30	—
RHS 150×50×6	150	50	6.0	—	—
RHS 200×100×5	200	100	5.0	22.00	29.00
RHS 200×100×12.5	200	100	12.5	53.40	—

Wall thickness availability: 1.6 mm – 16.0 mm.

2. Imperial Sizes – ASTM A500
Rectangular tubes are specified by outside width × depth in inches.

Size (in)	Wall Thickness (in)	Standard Lengths (ft)
8" × 6"	0.250 – 0.500	30, 34, 48
10" × 6"	0.250 – 0.500	30, 34, 48
12" × 6"	0.250 – 0.500	30, 34, 48
12" × 8"	0.250 – 0.500	30, 34, 48
14" × 8"	0.250 – 0.500	30, 34, 48
16" × 8"	0.250 – 0.500	30, 34, 48

Below are standard technical tables for square and rectangular steel pipes, covering chemical composition and tensile mechanical properties. All data complies with ASTM and EN standards for each steel grade. Chemical composition defines element content ranges to guarantee weldability, formability, and material purity. Tensile data shows standardized strength and elongation values, ensuring reliable mechanical performance, structural integrity, and load-bearing capacity. All technical indicators are traceable and support third-party inspection for industrial high-standard applications.

Chemical Requirements (%) – ASTM A500

Grade	C, max	Mn, max	P, max	S, max	Cu, min
Grade A	0.26	1.35	0.035	0.035	0.20
Grade B	0.26	1.35	0.035	0.035	0.20
Grade C	0.23	1.35	0.035	0.035	0.20
Grade D	0.26	1.35	0.035	0.035	0.20

Chemical Requirements (%) – EN 10219

Steel Grade	C, max	Si, max	Mn, max	P, max	S, max	N, max
S235JRH	0.17	—	1.40	0.040	0.040	0.012
S275J0H	0.20	—	1.50	0.035	0.035	0.012
S355J0H	0.22	0.55	1.60	0.035	0.035	0.012
S355J2H	0.22	0.55	1.60	0.035	0.035	0.012

Tensile Requirements – ASTM A500 (Shaped Structural Tubing)

Grade	Tensile Strength, min ksi [MPa]	Yield Strength, min ksi [MPa]	Elongation, min %
Grade A	45,000 [310]	39,000 [269]	25
Grade B	58,000 [400]	46,000 [317]	23
Grade C	62,000 [427]	50,000 [345]	21
Grade D	58,000 [400]	36,000 [250]	23

Tensile Requirements – EN 10219

Grade	Yield Strength, min MPa	Tensile Strength, MPa	Elongation, min %	Impact Test
S235JRH	235	360–510	20	27J @ +20°C
S275J0H	275	430–580	20	27J @ 0°C
S275J2H	275	430–580	20	27J @ -20°C
S355J0H	355	510–680	20	27J @ 0°C
S355J2H	355	510–680	20	27J @ -20°C
S355K2H	355	510–680	20	40J @ -30°C

Square and rectangular steel pipes are primarily manufactured by cold-forming processes using high-frequency electric resistance welding (ERW), or alternatively by TIG welding. The complete standardized production process includes raw material preparation, roll-forming, welding, sizing, surface treatment, and rigorous quality inspection, ensuring dimensionally stable, high-strength and corrosion-resistant pipes compliant with international standards.

Raw Material Preparation: Premium hot-rolled or cold-rolled steel coils are selected and processed by uncoiling, leveling, and edge trimming to ensure stable forming quality.

Roll-Forming & Welding: Strip steel is progressively formed through multiple forming rolls into a round tube, then welded by high-frequency ERW or TIG. The welded tube is then passed through sizing rolls to achieve the final square or rectangular shape.

Heat Treatment & Straightening: Post-weld heat treatment and straightening are applied to relieve residual stress, optimize internal microstructure, and meet structural and mechanical engineering standards.

Surface Finishing: Available finishes include hot-rolled, cold-rolled, lightly oiled, hot-dip galvanized, and electro-galvanized. Hot-dip galvanizing provides superior corrosion protection for outdoor and marine applications.

Cutting & End Finishing: Pipes are cut to precise lengths with square-cut ends and burrs removed, ready for installation.

Quality Inspection & Packaging: Finished pipes undergo strict NDT flaw detection, tensile testing, and manual screening. Only fully qualified products are packaged and delivered to ensure stable and reliable performance.

All square and rectangular steel pipes are manufactured in strict accordance with official industry standards and undergo comprehensive systematic testing before shipment, ensuring zero potential defects and complete structural integrity for industrial use.

Tensile Testing is implemented as a mandatory full-inspection procedure. This core test verifies that each finished pipe fully meets specification requirements for yield strength, tensile strength, and elongation.

Flattening Test ensures ductility and sound weld quality of the finished product.

Chemical Composition Analysis guarantees material purity and compliance with grade specifications.

After passing all quality tests, pipes undergo customized finishing and standardized packaging. Available processing includes precision straightening, custom fixed-length cutting, and professional surface treatments. Products can be bundled with steel strips, wrapped in waterproof paper, or packed in PVC sleeves and sackcloth. Each product is clearly stenciled with complete batch and manufacturing information, realizing full lot traceability and ensuring reliable, traceable product quality.

Q1: What is the difference between square steel pipe and rectangular steel pipe?

Square steel pipe (SHS) has equal side lengths, while rectangular steel pipe (RHS) has unequal side lengths. Both are hollow structural sections used in construction, mechanical, and engineering applications. The choice depends on specific load requirements and design constraints.

Q2: What are the advantages of hollow sections over solid bars?

Hollow sections offer superior strength-to-weight ratios, providing equivalent load-bearing capacity with significantly less material weight. This results in lighter structures, reduced foundation requirements, and lower transportation and installation costs.

Q3: What is the difference between cold-formed (EN 10219) and hot-finished (EN 10210) hollow sections?

Cold-formed hollow sections (EN 10219) are manufactured from coil at room temperature with ERW welding, offering tighter tolerances, smoother surfaces, and lower cost. Hot-finished sections (EN 10210) are heat-treated after forming, providing better toughness and stress-relief, making them ideal for welding, seismic zones, and low-temperature applications.

Q4: Why are hollow sections suitable for building construction?

Square and rectangular hollow sections provide excellent structural stability, uniform load distribution, and high strength-to-weight ratios. Their clean aesthetic appearance and ease of connection make them ideal for columns, beams, roof trusses, and architectural frameworks.

Q5: What are the anti-corrosion options for hollow sections?

Available surface treatments include hot-dip galvanizing, electro-galvanizing, and oiling. Hot-dip galvanizing provides superior corrosion protection for outdoor, marine, and aggressive environmental applications.

Q6: Can hollow sections be custom-made to specific sizes?

Yes. We offer custom sizes beyond standard specifications, with dimensions tailored to customer requirements. Custom wall thicknesses, lengths, and surface finishes are available upon request.

Q7: What quality certifications are provided?

All products are supplied with Mill Test Certificates in accordance with EN 10204/3.1B. Full third-party inspection certification reports can be provided upon request.

Q8: In which scenarios are hollow sections irreplaceable?

Square and rectangular hollow sections are irreplaceable for building structural frameworks, bridge construction, crane building, mechanical engineering, and furniture design. Their unique combination of high strength, light weight, and aesthetic appeal cannot be matched by other steel profiles in these applications.

Keywords	Square Steel Pipe, Rectangular Steel Pipe, SHS, RHS, Structural Hollow Section, Cold-formed Hollow Section
Size	Square (SHS): 10×10 mm – 500×500 mm
	Rectangular (RHS): 10×20 mm – 600×400 mm
	Wall Thickness: 0.5 mm – 40.0 mm
	Length: 0.1 m – 18.0 m
Standards & Materials	ASTM A500,ASTM A513,EN 10219,EN 10210,JIS G 3466,GB/T 6728
Surface Finishes	Hot rolled, cold rolled, lightly oiled, hot-dip galvanized, electro-galvanized, black finish . Custom anti-corrosion surface

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FAQ

Q1: What is the difference between square steel pipe and rectangular steel pipe?

Q2: What are the advantages of hollow sections over solid bars?

Q3: What is the difference between cold-formed (EN 10219) and hot-finished (EN 10210) hollow sections?

Q4: Why are hollow sections suitable for building construction?

Q5: What are the anti-corrosion options for hollow sections?

Q6: Can hollow sections be custom-made to specific sizes?

Q7: What quality certifications are provided?

Q8: In which scenarios are hollow sections irreplaceable?

Q1: What is the difference between square steel pipe and rectangular steel pipe?

Q2: What are the advantages of hollow sections over solid bars?

Q3: What is the difference between cold-formed (EN 10219) and hot-finished (EN 10210) hollow sections?

Q4: Why are hollow sections suitable for building construction?

Q5: What are the anti-corrosion options for hollow sections?

Q6: Can hollow sections be custom-made to specific sizes?

Q7: What quality certifications are provided?

Q8: In which scenarios are hollow sections irreplaceable?

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