Square Steel Pipe – CREATEEL INTERNATIONAL LIMITED

Square & Rectangular Steel Pipe

Hollow structural sections for construction, mechanical engineering, furniture, and infrastructure. Available in square, rectangular, and circular profiles.

OD: 20×20–500×500mmWT: 1.0–16mmASTM A500EN 10219GB/T 6728

Square & Rectangular Steel Pipe

Square and rectangular steel pipes (Hollow Structural Sections – HSS) are tubular products with a square or rectangular cross-section. They are manufactured either by welding (ERW) from steel strip or coil, or as seamless products from solid billets.

HSS offer significant advantages over traditional structural shapes: higher strength-to-weight ratio, uniform strength in all directions, aesthetic appeal for exposed architecture, and reduced wind resistance. They are the material of choice for modern steel construction worldwide.

Equal Wall ThicknessPrecise DimensionsHigh StrengthCost EffectiveSquare & RectangularWeldable Surface

Technical Specifications

Applicable Standards

Standard	Available Steel Grades	Description
ASTM A500	Grade B	Standard specification for cold-formed welded and seamless carbon steel structural tubing in rounds and shapes
EN 10219	S235JR, S355JR	European standard for cold formed welded structural hollow sections of non-alloy and fine grain steels
EN 10210	S235JRH, S355J2H	European standard for hot finished structural hollow sections of non-alloy and fine grain steels
JIS G3466	STKR400, STKR490	Japanese standard for carbon steel square and rectangular tubes for general structure
GB/T 6728	Q235, Q355	Chinese national standard for cold forming hollow sectional steel for general structure
ASTM A252	Grade 1, Grade 2, Grade 3	Standard specification for welded and seamless steel pipe piles
AS/NZS 1163	C250, C350, C350L0	Australian/New Zealand standard for cold-formed structural steel hollow sections

Square & Rectangular Pipe Dimensions

Complete size range with corresponding wall thickness specifications (mm).

SIZE	SIZE	Thickness	SIZE	SIZE	Thickness	SIZE	SIZE	Thickness
mm	mm	mm	mm	mm	mm	mm	mm	mm
		1.0		40*90	1.3~1.5	130*130	100*180	2.5
		1.2	55*55	40*100	1.7	160*160	100*250	2.75～3.25
		1.3	65*65	50*60	1.8	180*180	120*160	3.5～4.75
19*19		1.4	70*70	50*75	2.0	60*200	120*200	4.75～5.0
20*20		1.5	90*90	50*80	2.2	60*220	140*180	5.25～5.75
		1.7		50*90	2.5～4	75*150	150*170	7.5～9.75
		1.8	30*100	60*80	4.25～5	80*200	150*180	11.5～11.75
		2.0~2.2	40*70	60*120	5.25～5.75	80*220	150*200	12.5～16
		2.5~2.75		80*100	7.5～9.75	135*135	125*250	2.5
		1.0		40*120	1.3	200*200	130*250	2.75
		1.2		40*140	1.5	225*225	140*240	3.0～5.75
		1.3		50*100	1.7		150*220	7.5～11.75
		1.4		50*110	1.8	100*300	150*250	12.5～14.75
25*25	20*30	1.5	75*75	50*120	2.0	100*350	200*250	15.5～15.75
		1.7	80*80	50*125	2.2	220*220	130*300	3.5~4.0
		1.8	85*85	60*90	2.5～4	240*240	150*300	4.5~7.75
		2.0		60*100	4.25～5	250*250	150*350	9.5~11.75
		2.2		60*110	5.25～5.75	75*250	180*300	12.5~14.75
		2.5～3		70*100	7.5～9.75	100*400	200*280	15.5~17.75
		1.0		40*135	1.8	130*200	200*300	18~30
		1.2		40*150	2.0	300*300		4.5~11.75
		1.3		50*140	2.2		250*300	12.5~14.75
		1.4	100*100	50*150	2.5~4.75	200*350	250*350	15.5~17.75
30*30	20*40	1.5		60*130	5.0~6.0	200*400		18~30
32*32	20*50	1.7		60*140	6.5~9.75		250*450	4.75~11.75
35*35	25*40	1.8	80*120	75*125	11.5～16	350*350	300*320	12.5~14.75
	30*40	2.0		70*150	2.0		300*350	15.5~17.75
		2.2	110*110	80*140	2.5	200*500	300*400	18~30
		2.5～3	120*120	80*160	2.75	280*280	250*400	4.5~5.75
		3.5～3.75	125*125	90*150	3.0～4.0	400*400	250*500	6.5~11.75
	20*60	1.2		90*160	4.25～4.75		300*450	12.5~14.75
	20*80	1.3	50*160	100*120	5.25～6.0	200*450	300*500	15.5~17.75
	25*50	1.4	60*150	100*125	6.5～7.75	200*600	350*400	18~30
38*38	25*65	1.5	60*160	100*140	9.5～9.75		300*600	4.5~9.75
40*40	25*70	1.7	60*180	100*150	10.5～11.75	320*320	300**650	11.5~13.75
45*45	30*50	1.8	65*180	120*180	12.5～15.75	450*450	300*700	14.5~15.75
50*50	30*60	2.0	127*127	60*170	2.5	500*500	400*500	16.5～17.75
60*60	30*70	2.2	140*140	70*160	2.75		400*600	18~30
	35*60	2.5～4	150*150	75*200	3.0～5.75
40*80	39*49	4.25～5		80*150	7.5~9.75
50*70	40*50	5.25～5.75	50*200	80*180	10～11.75
	40*60	6～7.75		100*200	12.5～15

Chemical Composition (%)

Grade	C (max)	Si (max)	Mn (max)	P (max)	S (max)	Cu (max)	Others (max)
ASTM A500 Gr.B	0.26	—	1.35	0.035	0.035	0.20 min ①	—
EN 10219 S235JR	0.17	—	1.40	0.035	0.035	0.55	N 0.012
EN 10219 S355JR	0.24	0.55	1.60	0.035	0.035	0.55	N 0.012
EN 10210 S235JRH	0.17	—	1.40	0.045	0.045	—	N 0.009 ②
EN 10210 S355J2H	0.22	0.55	1.60	0.035	0.035	—	—
JIS G3466 STKR400	0.25	—	—	0.040	0.040	—	—
JIS G3466 STKR490	0.18	0.55	1.50	0.040	0.040	—	—
GB/T 6728 Q235B	0.20	0.35	1.40	0.045	0.045	0.30	Cr 0.30 / Ni 0.30 ③
GB/T 6728 Q355B	0.24	0.55	1.60	0.035	0.035	0.40	Cr/Ni 0.30 / N 0.012 ③
ASTM A252 Gr.2	—	—	—	0.050	—	—	—
ASTM A252 Gr.3	—	—	—	0.050	—	—	—
AS/NZS 1163 C250L0	0.12	0.05	0.50	0.030	0.030	—	Cr 0.30 / Mo 0.10 / Al 0.10 / Ti 0.04 / CEV 0.25 ④
AS/NZS 1163 C350L0	0.20	0.25	1.60	0.030	0.030	—	Cr 0.30 / Mo 0.10 / Al 0.10 / Ti 0.04 / CEV 0.43 ④

Notes: ① A500: Cu ≥ 0.20% applies only when copper-bearing steel is specified. ② EN 10210-1:1994 (hot-finished hollow sections, t ≤ 65 mm); S max mirrors the P limit of each grade. ③ GB/T 6728 steel grades per GB/T 700 and GB/T 1591. ④ AS/NZS 1163: Cr ≤ 0.30%, Mo ≤ 0.10%, Al ≤ 0.10%, Ti ≤ 0.04%; CEV ≤ 0.25 (C250L0) / 0.43 (C350L0). No Si limit specified for S235JR/S235JRH, A500, STKR400, S195T-type grades; S355JR/S355J2H Si ≤ 0.55%.

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Impact (Charpy V-notch)
ASTM A500 Gr.B	≥400	≥315	≥23	—
EN 10219 S235JR	360–510	≥235	≥26	27 J @ +20 °C
EN 10219 S355JR	470–630	≥355	≥22	27 J @ +20 °C
EN 10210 S235JRH	340–470 ①	≥235	≥26	—
EN 10210 S355J2H	490–630 ①	≥355	≥22	27 J @ −20 °C
JIS G3466 STKR400	≥400	≥245	≥23	—
JIS G3466 STKR490	≥490	≥325	≥23	—
GB/T 6728 Q235B	370–500	≥235	≥26	27 J @ +20 °C
GB/T 6728 Q355B	470–630	≥355	≥22	34 J @ +20 °C
ASTM A252 Gr.2	≥414	≥241	≥25	—
ASTM A252 Gr.3	≥455	≥310	≥20	—
AS/NZS 1163 C250L0	≥320	≥250	≥18	27 J @ 0 °C
AS/NZS 1163 C350L0	≥430	≥350	≥16	27 J @ 0 °C

Notes: ① EN 10210 is hot-finished: tensile range for t ≥ 3 mm differs from cold-formed EN 10219 (S235: 340–470 vs 360–510; S355: 490–630 vs 470–630). A500 values are for shaped (square/rectangular) tubing — yield strength differs from round tubing. EN 10210 JR quality: Charpy impact not verified by the standard (27 J at +20 °C by agreement). JIS G3466 elongation per No. 5 test piece, reduced 1.5 per mm below 8 mm thickness; no impact requirement. All impact values are longitudinal Charpy V-notch (KV₂). Mechanical properties may vary with section size and wall thickness; all values are minimum unless shown as a range.

Available Surface Treatments

Black / Bare

No surface treatment. As-welded finish for applications where further processing or painting will be done.

Hot-Dip Galvanized

Zinc coating 40–120μm per GB/T 13912. Excellent corrosion resistance for outdoor and structural applications.

Pre-Galvanized

Steel strip galvanized before forming. Uniform zinc coating on exterior surface. Cost-effective for small sizes.

Powder Coated

Electrostatic powder coating in various colors (RAL). Durable finish for architectural and furniture applications.

Painted / Epoxy

Anti-corrosion paint or epoxy coating for additional protection. Color options available per customer request.

Oiled / Varnished

Light oil coating for temporary rust prevention during storage and transport. Standard for most export orders.

Packing & Shipping

📦 Packing Methods

Bundles with steel wire straps
Wrapped with waterproof plastic woven bag
Custom packing per buyer requirements

🚢 Shipping Information

MOQ: 5 tons per size
Delivery: 10–30 days
Port: Tianjin / Xingang, China
Container: 20ft / 40ft GP/HQ
Payment: T/T, L/C, D/P accepted
Inspection: SGS, BV available

Manufacturing Process

Precision forming and welding process for square and rectangular steel pipes with consistent dimensions and excellent structural integrity.

Raw Material Inspection

Inspect steel strip composition, mechanical properties, surface and dimensions for production compliance.

Uncoiling

Unfold steel coils and feed flat strip steadily into the production line.

Strip End Cutting & Butt Welding

Trim strip ends and weld strips together to sustain continuous production.

Strip Leveling

Level steel strip to eliminate deformation and internal stress.

Edge Trimming

Trim strip edges to ensure uniform width and clean welding edges.

Round Pipe Pre-forming

Bend flat strip into round tubular blank via multi-pass forming rollers.

High Frequency Induction Welding

Heat pipe edges with high-frequency current and squeeze to form firm weld seams.

Weld Bead Removal

Remove inner and outer weld beads for smooth pipe surface.

Online Heat Treatment

Relieve welding residual stress to improve pipe mechanical performance.

Online Cooling

Rapidly cool hot pipes to stabilize metal structure.

Sizing & Straightening (Round Pipe)

Calibrate pipe diameter and straighten pipe to eliminate ovality and bending.

Square & Rectangular Forming

Shape qualified round pipes into standard square and rectangular pipes.

Flying Saw Cutting to Fixed Length

Cut continuous pipes into required fixed lengths.

Pipe End Deburring

Remove sharp burrs from pipe ends for smooth assembly.

Nondestructive Testing

Detect internal and welding defects without damaging the pipe.

Surface Inspection

Check pipe surface for scratches and appearance defects.

Marking

Print pipe specifications, batch and production information.

Anti-rust Treatment (Optional)

Apply anti-rust coating to prevent pipe corrosion.

Packaging & Delivery

Bundle qualified pipes and arrange warehousing and delivery.

Applications

Where our products deliver proven performance across industries worldwide.

CONSTRUCTION

Structural Frames & Building Construction

Square and rectangular hollow sections carry compression and bending efficiently in columns, beams, trusses, and long-span roof structures, with clean lines for exposed architectural steel.

✓ EN 10219 S235–S460

MACHINERY

Machinery & Equipment Frames

Machine bases, conveyor frames, and material-handling equipment use SHS/RHS for high torsional rigidity with simple, welded joints and reduced fabrication weight.

✓ Tight tolerance, ready-to-weld edges

AUTOMOTIVE

Trailer, Truck Body & Chassis

Rectangular hollow sections form trailer decks, truck bodies, and chassis cross-members, combining torsional stiffness with easy welding and consistent fit-up.

✓ Automotive-grade structural steels

INFRASTRUCTURE

Bridges, Towers & Racking

Transmission towers, communication masts, storage racking, and pedestrian bridges exploit the efficient geometry of hollow sections under multi-directional loads.

✓ Galvanized & painted options

ARCHITECTURE

Architectural & Decorative Structures

Exposed canopies, façades, stairs, and handrails use square tube for its clean aesthetic; grade and surface options range from standard to pickled-and-oiled.

✓ Clean lines, minimal surface prep

FOUNDATION

Piling & Ground Support

Square tube piles and trench sheeting serve foundation and shoring works where point-bearing and driving durability are required.

✓ ASTM A252 / EN 10219 piling

Frequently Asked Questions

What is square steel pipe (SHS/RHS)?＋

Square hollow sections (SHS) and rectangular hollow sections (RHS) are cold- or hot-formed tubes with square or rectangular cross-sections, made from strip by high-frequency welding or from plate by forming and welding.

What standards does your square pipe comply with?＋

We produce to EN 10219/10210, ASTM A500 Gr.B/C, ASTM A252, JIS G3466 and GB/T 6728, with full mill certification.

What size range is available?＋

Square: 15×15 mm to 600×600 mm; rectangular: up to 800×400 mm; wall thickness 1.0–25 mm; lengths 6 m, 12 m, or custom.

What is the difference between hot-formed and cold-formed SHS?＋

Hot-formed (EN 10210) sections have superior toughness and are preferred for dynamic/cold-climate loads; cold-formed (EN 10219) offer tighter tolerances and higher yield from cold work at lower cost.

Do you supply galvanized square pipe?＋

Yes — hot-dip galvanized to EN 10240 / ASTM A123 inside and out, ideal for outdoor structures, racking, and fencing.

How is quality controlled on each length?＋

Every length is dimensionally inspected; weld seams receive ultrasonic or eddy-current testing; mechanical and flatten tests are run per lot per standard.

Can you cut, mitre, or pre-fabricate to drawing?＋

Yes. We offer cut-to-length, mitre cutting, punching, coping, and pre-welded assemblies to your drawings.

What is the minimum order quantity and lead time?＋

MOQ is typically 20–50 tons per size depending on dimensions; common sizes ship in 2–4 weeks. Contact us for a firm quotation.

What corrosion protection options exist for outdoor structures?＋

Hot-dip galvanizing (most common), duplex systems (galvanizing + paint), and 3PE for buried use — all available with single-source responsibility.

What documentation comes with my order?＋

EN 10204 3.1 mill certificates, dimensional reports, NDT records and coating certificates; third-party inspection on request.