Carbon Steel Hollow Sections

Carbon steel hollow sections are often selected for structural frames, machinery supports, building members and fabricated steel structures where shape accuracy, wall thickness and straightness matter as much as steel grade.Forever Steel supplies carbon steel hollow sections for structural frames, machinery supports, building members and fabricated steel structures. Available profiles include square hollow sections (SHS), rectangular hollow sections (RHS) and circular hollow sections (CHS), with ASTM A500, EN 10219, EN 10210 and related project standards available.

1. Comprehensive Dimensional Range

We utilize advanced cold-forming and high-frequency welding technologies to produce a wide array of profiles:

Square Hollow Sections (SHS): 20mm x 20mm – 600mm x 600mm

Rectangular Hollow Sections (RHS): 20mm x 30mm – 400mm x 600mm

Circular Hollow Sections (CHS): 21.3mm – 1219mm (O.D.)

Wall Thickness (W.T.): 1.2mm – 50mm (Tailored to specific structural load requirements).

2. Global Standards & Material Compliance

Our production strictly adheres to international structural benchmarks, ensuring safety and global project compatibility:

European Standards: EN 10210 (Hot finished), EN 10219 (Cold formed).

American Standards: ASTM A500 Grade A/B/C/D, ASTM A501, ASTM A1085.

Australian Standards: AS/NZS 1163 (C250, C350, C450).

Japanese/Chinese Standards: JIS G3466, GB/T 6728, GB/T 3094.

Steel Grades: S235JR, S275J0H, S355J2H, S355K2H, Q235, Q355.

3. Applications for Structural Hollow Sections

Carbon steel hollow sections are used in building structures, warehouse frames, machinery bases, handrails, fencing, trailers, agricultural equipment, solar mounting systems and general fabrication. Buyers should confirm profile type, outside dimension, wall thickness, steel grade, length, surface finish and packing method before quotation.

4. Quality Control Before Shipment

Before shipment, Forever Steel can check outer dimensions, wall thickness, straightness, surface condition, marking, bundle packing and required documents such as mill test certificates. For export orders, the inspection scope can be matched to the project standard, purchase order and third-party inspection requirements.

5. Technical Resources

· ASTM A500 Structural Tubing Guide

· EN 10219 vs EN 10210: Key Differences for Structural Hollow Sections

· S235 vs S275 vs S355 Steel Grades: Which Structural Pipe Grade to Choose?

· HSS Column Base Plate Connections: Weld Access, Drainage Holes and Galvanizing After Fabrication

· Box Tubing vs Channel Steel for Light Structural Frames: Stiffness, Welding and Cost Trade-Offs

Steel Pipe Tolerance Guide: What Buyers Must Check Before Order, During Production and Before Shipment

Dimensions and Sizes of Rectangular Hollow Section

Square Hollow Section Sizes	Weight	W. T.	Rectangular Hollow Section Sizes	Weight	W. T.
	[kg/m]	[mm]		[kg/m]	[mm]
20 x 20 x 2 SHS	1.1	2	50 x 25 x 2.5 RHS	2.7	2.5
20 x 20 x 2.5 SHS	1.3	2.5	50 x 25 x 2.5 RHS	2.7	2.5
25 x 25 x 2 SHS	14	2	50 x 25 x 3 RHS	3.2	3
25 x 25 x 2.5 SHS	1.7	2.5	50 x 30 x 2.5 RHS	2.9	2.5
25 x 25 x 3 SHS	2	3	50 x 30 x 3 RHS	3.4	3
30 x 30 x 2 SHS	1.7	2	50 x 30 x 3.2 RHS	3.6	3.2
30 x 30 x 2.5 SHS	2.1	2.5	50 x 30 x 3.6 RHS	4	3.6
30 x 30 x 3 SHS	2.5	3	50 x 30 x 4 RHS	4.4	4
40 x 40 x 2.5 SHS	2.9	2.5	50 x 30 x 5 RHS	5.3	5
40 x 40 x 3 SHS	3.4	3	60 x 40 x 2.5 RHS	3.7	2.5
40 x 40 x 3.2 SHS	3.6	3.2	60 x 40 x 3 RHS	4.4	3
40 x 40 x 3.6 SHS	4	3.6	60 x 40 x 3.2 RHS	4.6	3.2
40 x 40 x 4 SHS	4.4	4	60 x 40 x 3.6 RHS	5.1	3.6
40 x 40 x 5 SHS	5.3	5	60 x 40 x 4 RHS	5.6	4
50 x 50 x 2.5 SHS	3.7	2.5	60 x 40 x 5 RHS	6.9	5
50 x 50 x 3 SHS	4.4	3	60 x 40 x 6 RHS	8	6
50 x 50 x 3.2 SHS	4.6	3.2	60 x 40 x 6.3 RHS	8.3	6.3
50 x 50 x 3.6 SHS	5.1	3.6	80 x 40 x 3 RHS	5.3	3
50 x 50 x 4 SHS	5.6	4	80 x 40 x 3.2 RHS	5.6	3.2
50 x 50 x 5 SHS	6.9	5	80 x 40 x 3.6 RHS	6.3	3.6
50 x 50 x 6 SHS	8	6	80 x 40 x 4 RHS	6.9	4
50 x 50 x 6.3 SHS	8.3	6.3	80 x 40 x 5 RHS	8.4	5
60 x 60 x 2.5 SHS	4.5	2.5	80 x 40 x 6 RHS	9.9	6
60 x 60 x 3 SHS	5.3	3	80 x 40 x 6.3 RHS	10.3	6.3
60 x 60 x 3.2 SHS	5.6	3.2	80 x 40 x 8 RHS	12.5	8
60 x 60 x 3.6 SHS	6.3	3.6	90 x 50 x 3 RHS	6.2	3
60 x 60 x 4 SHS	6.9	4	90 x 50 x 3.2 RHS	6.6	3.2
60 x 60 x 5 SHS	8.4	5	90 x 50 x 3.6 RHS	7.4	3.6
60 x 60 x 6 SHS	9.9	6	90 x 50 x 4 RHS	8.2	4
60 x 60 x 6.3 SHS	10.3	6.3	90 x 50 x 5 RHS	10	5
60 x 60 x 8 SHS	12.5	8	90 x 50 x 6 RHS	11.8	6
70 x 70 x 3 SHS	6.2	3	90 x 50 x 6.3 RHS	12.3	6.3
70 x 70 x 3.2 SHS	6.6	3.2	90 x 50 x 8 RHS	15	8
70 x 70 x 3.6 SHS	7.4	3.6	100 x 50 x 3 RHS	6.7	3
70 x 70 x 4 SHS	8.2	4	100 x 50 x 3.2 RHS	7.1	3.2
70 x 70 x 5 SHS	10	5	100 x 50 x 3.6 RHS	8	3.6
70 x 70 x 6 SHS	11.8	6	100 x 50 x 4 RHS	8.8	4
70 x 70 x 6.3 SHS	12.3	6.3	100 x 50 x 5 RHS	10.8	5
70 x 70 x 8 SHS	15	8	100 x 50 x 6 RHS	12.7	6
80 x 80 x 3 SHS	7.2	3	100 x 50 x 6.3 RHS	13.3	6.3
80 x 80 x 3.2 SHS	7.6	3.2	100 x 50 x 8 RHS	16.3	8
80 x 80 x 3.6 SHS	8.5	3.6	100 x 60 x 3 RHS	7.2	3
80 x 80 x 4 SHS	9.4	4	100 x 60 x 3.2 RHS	7.6	3.2
80 x 80 x 5 SHS	11.6	5	100 x 60 x 3.6 RHS	8.5	3.6
80 x 80 x 6 SHS	13.6	6	100 x 60 x 4 RHS	9.4	4
80 x 80 x 6.3 SHS	14.2	6.3	100 x 60 x 5 RHS	11.6	5
80 x 80 x 8 SHS	17.8	8	100 x 60 x 6 RHS	13.6	6
90 x 90 x 5 SHS	13.1	5	100 x 60 x 6.3 RHS	14.2	6.3
90 x 90 x 6 SHS	15.5	6	100 x 60 x 8 RHS	17.5	8
90 x 90 x 6.3 SHS	16.2	6.3	120 x 60 x 3.6 RHS	9.7	3.6
90 x 90 x 8 SHS	20.1	8	120 x 60 x 4 RHS	10.7	4
100 x 100 x 3.6 SHS	10.8	3.6	120 x 60 x 5 RHS	13.1	5
100 x 100 x 4 SHS	11.9	4	120 x 60 x 6 RHS	15.5	6
100 x 100 x 5 SHS	14.7	5	120 x 60 x 6.3 RHS	16.2	6.3
100 x 100 x 6 SHS	17.4	6	120 x 60 x 8 RHS	20.1	8
100 x 100 x 6.3 SHS	18.2	6.3	120 x 60 x 10 RHS	24.6	10
100 x 100 x 8 SHS	22.6	8	120 x 80 x 3.6 RHS	10.8	3.6
100 x 100 x 10 SHS	27.4	10	120 x 80 x 4 RHS	11.9	4
120 x 120 x 4 SHS	14.4	4	120 x 80 x 5 RHS	14.7	5
120 x 120 x 5 SHS	18	5	120 x 80 x 6 RHS	17.4	6
120 x 120 x 6 SHS	21.2	6	120 x 80 x 6.3 RHS	18.2	6.3
120 x 120 x 6.3 SHS	22.2	6.3	120 x 80 x 8 RHS	22.6	8
120 x 120 x 8 SHS	27.6	8	120 x 80 x 10 RHS	27.4	10
120 x 120 x 10 SHS	33.7	10	140 x 80 x 4 RHS	13.2	4
120 x 120 x 12 SHS	39.5	12	140 x 80 x 5 RHS	16.3	5
120 x 120 x 12.5 SHS	40.9	12.5	140 x 80 x 6 RHS	19.3	6
140 x 140 x 5 SHS	21	5	140 x 80 x 6.3 RHS	20.2	6.3
140 x 140 x 6 SHS	24.9	6	140 x 80 x 8 RHS	25.1	8
140 x 140 x 6.3 SHS	26.1	6.3	140 x 80 x 10 RHS	30.6	10
140 x 140 x 8 SHS	32.6	8	150 x 100 x 4 RHS	15.1	4
140 x 140 x 10 SHS	40	10	150 x 100 x 5 RHS	18.6	5
140 x 140 x 12 SHS	47	12	150 x 100 x 6 RHS	22.1	6
140 x 140 x 12.5 SHS	48.7	12.5	150 x 100 x 6.3 RHS	23.1	6.3
150 x 150 x 5 SHS	22.6	5	150 x 100 x 8 RHS	28.9	8
150 x 150 x 6 SHS	26.8	6	150 x 100 x 10 RHS	35.3	10
150 x 150 x 6.3 SHS	28.1	6.3	150 x 100 x 12 RHS	41.4	12
150 x 150 x 8 SHS	35.1	8	150 x 100 x 12.5 RHS	42.8	12.5
150 x 150 x 10 SHS	43.1	10	160 x 80 x 4 RHS	14.4	4
150 x 150 x 12 SHS	50.8	12	160 x 80 x 5 RHS	17.8	5
150 x 150 x 12.5 SHS	52.7	12.5	160 x 80 x 6 RHS	21.2	6
150 x 150 x 16 SHS	65.2	16	160 x 80 x 6.3 RHS	22.2	6.3
160 x 160 x 5 SHS	24.1	5	160 x 80 x 8 RHS	27.6	8
160 x 160 x 6 SHS	28.7	6	160 x 80 x 10 RHS	33.7	10
160 x 160 x 6.3 SHS	30.1	6.3	160 x 80 x 12 RHS	39.5	12
160 x 160 x 8 SHS	37.6	8	160 x 80 x 12.5 RHS	40.9	12.5
160 x 160 x 10 SHS	46.3	10	180 x 100 x 4 RHS	16.9	4
160 x 160 x 12 SHS	54.6	12	180 x 100 x 5 RHS	21	5
160 x 160 x 12.5 SHS	56.6	12.5	180 x 100 x 6 RHS	24.9	6
160 x 160 x 16 SHS	70.2	16	180 x 100 x 6.3 RHS	26.1	6.3
180 x 180 x 5 SHS	27.3	5	180 x 100 x 8 RHS	32.6	8
180 x 180 x 6 SHS	32.5	6	180 x 100 x 10 RHS	40	10
180 x 180 x 6.3 SHS	34	6.3	180 x 100 x 12 RHS	47	12
180 x 180 x 8 SHS	42.7	8	180 x 100 x 12.5 RHS	48.7	12.5
180 x 180 x 10 SHS	52.5	10	200 x 100 x 4 RHS	18.1	4
180 x 180 x 12 SHS	62.1	12	200 x 100 x 5 RHS	22.6	5
180 x 180 x 12.5 SHS	64.4	12.5	200 x 100 x 6 RHS	26.8	6
180 x 180 x 16 SHS	80.2	16	200 x 100 x 6.3 RHS	28.1	6.3
200 x 200 x 5 SHS	30.4	5	200 x 100 x 8 RHS	35.1	8
200 x 200 x 6 SHS	36.2	6	200 x 100 x 10 RHS	43.1	10
200 x 200 x 6.3 SHS	38	6.3	200 x 100 x 12 RHS	50.8	12
200 x 200 x 8 SHS	47.7	8	200 x 100 x 12.5 RHS	52.7	12.5
200 x 200 x 10 SHS	58.8	10	200 x 100 x 16 RHS	65.2	16
200 x 200 x 12 SHS	69.6	12	200 x 120 x 6 RHS	28.7	6
200 x 200 x 12.5 SHS	72.3	12.5	200 x 120 x 6.3 RHS	29.9	6.3
200 x 200 x 16 SHS	90.3	16	200 x 120 x 8 RHS	37.3	8
220 x 220 x 6 SHS	40	6	200 x 120 x 10 RHS	45.9	10
220 x 220 x 6.3 SHS	41.9	6.3	200 x 120 x 12 RHS	54.5	12
220 x 220 x 8 SHS	52.7	8	200 x 120 x 12.5 RHS	55.7	12.5
220 x 220 x 10 SHS	65.1	10	250 x 150 x 5 RHS	30.4	5
220 x 220 x 12 SHS	77.2	12	250 x 150 x 6 RHS	36.2	6
220 x 220 x 12.5 SHS	80.1	12.5	250 x 150 x 6.3 RHS	38	6.3
220 x 220 x 16 SHS	100	16	250 x 150 x 8 RHS	47.7	8
250 x 250 x 5 SHS	38.3	5	250 x 150 x 10 RHS	58.8	10
250 x 250 x 6 SHS	45.7	6	250 x 150 x 12 RHS	69.6	12
250 x 250 x 6.3 SHS	47.9	6.3	250 x 150 x 12.5 RHS	72.3	12.5
250 x 250 x 8 SHS	60.3	8	250 x 150 x 16 RHS	90.3	16
250 x 250 x 10 SHS	74.5	10	260 x 180 x 6 RHS	40	6
250 x 250 x 12 SHS	88.5	12	260 x 180 x 6.3 RHS	41.9	6.3
250 x 250 x 12.5 SHS	91.9	12.5	260 x 180 x 8 RHS	52.7	8
250 x 250 x 16 SHS	115	16	260 x 180 x 10 RHS	65.1	10
260 x 260 x 6 SHS	47.6	6	260 x 180 x 12 RHS	77.2	12
260 x 260 x 6.3 SHS	49.9	6.3	260 x 180 x 12.5 RHS	80.1	12.5
260 x 260 x 8 SHS	62.8	8	260 x 180 x 16 RHS	100	16
260 x 260 x 10 SHS	77.7	10	300 x 200 x 5 RHS	38.3	5
260 x 260 x 12 SHS	92.2	12	300 x 200 x 6 RHS	45.7	6
260 x 260 x 12.5 SHS	95.8	12.5	300 x 200 x 6.3 RHS	47.9	6.3
260 x 260 x 16 SHS	120	16	300 x 200 x 8 RHS	60.3	8
300 x 300 x 6 SHS	55.1	6	300 x 200 x 10 RHS	74.5	10
300 x 300 x 6.3 SHS	57.8	6.3	300 x 200 x 12 RHS	88.5	12
300 x 300 x 8 SHS	72.8	8	300 x 200 x 12.5 RHS	91.9	12.5
300 x 300 x 10 SHS	90.2	10	300 x 200 x 16 RHS	115	16
300 x 300 x 12 SHS	107	12	350 x 250 x 6 RHS	55.1	6
300 x 300 x 12.5 SHS	112	12.5	350 x 250 x 6.3 RHS	57.8	6.3
300 x 300 x 16 SHS	141	16	350 x 250 x 8 RHS	72.8	8
350 x 350 x 8 SHS	85.4	8	350 x 250 x 10 RHS	90.2	10
350 x 350 x 10 SHS	106	10	350 x 250 x 12 RHS	107	12
350 x 350 x 12 SHS	126	12	350 x 250 x 12.5 RHS	112	12.5
350 x 350 x 12.5 SHS	131	12.5	350 x 250 x 16 RHS	141	16
350 x 350 x 16 SHS	166	16	400 x 200 x 6 RHS	55.1	6
400 x 400 x 8 SHS	97.9	8	400 x 200 x 6.3 RHS	57.8	6.3
400 x 400 x 10 SHS	122	10	400 x 200 x 8 RHS	72.8	8
400 x 400 x 12 SHS	145	12	400 x 200 x 10 RHS	90.2	10
400 x 400 x 12.5 SHS	151	12.5	400 x 200 x 12 RHS	107	12
400 x 400 x 16 SHS	191	16	400 x 200 x 12.5 RHS	112	12.5
400 x 400 x 20 SHS	235	20	400 x 200 x 16 RHS	141	16
500 x 500 x 10 SHS	153.9	10	450 x 250 x 8 RHS	85.4	8
500 x 500 x 12 SHS	183.9	12	450 x 250 x 10 RHS	106	10
500 x 500 x 16 SHS	243.2	16	450 x 250 x 12 RHS	126	12
500 x 500 x 18 SHS	272.4	18	450 x 250 x 12.5 RHS	131	12.5
500 x 500 x 20 SHS	301.4	20	450 x 250 x 16 RHS	166	16
600 x 600 x 14 SHS	257.6	14	500 x 300 x 8 RHS	97.9	8
600 x 600 x 16 SHS	293.4	16	500 x 300 x 10 RHS	122	10
600 x 600 x 18 SHS	328.9	18	500 x 300 x 12 RHS	145	12
800 x 800 x 22 SHS	537.4	22	500 x 300 x 12.5 RHS	151	12.5
800 x 800 x 24 SHS	584.8	24	500 x 300 x 16 RHS	191	16
800 x 800 x 28 SHS	678.7	28	500 x 300 x 20 RHS	235	20

Hollow Section Standards Tolerance Comparison

Standard	Outside Dimensions (B,H)	Wall Thickness (t)	Length (L)
ASTM A500(Cold-Formed)	≤2 1/2": ±0.020 in (0.5 mm >2 1/2 to 3 1/2": ±0.025 in >3 1/2 to 5 1/2": ±0.030 in >5 1/2": ±1%	±10% of nominal wall thickness	Fixed Length:+1/2 in / −1/4 in(+12.7 mm / −6.4 mm)
EN 10219(Cold-Formed)	B,H<100 mm: ±1% (min ±0.5 mm 100≤B,H≤200 mm: ±0.8% B,H>200 mm: ±0.6%	t≤5 mm: ±10% t>5 mm: ±0.5 mm	Fixed Length:<6000 mm: +10/0 mm ≥6000 mm: +15/0 mm
EN 10210(Hot-Finished)	±1% (minimum ±0.5 mm)	Individual: −10%Mean (4 sides): ±10%	Fixed Length:<6000 mm: +10/0 m ≥6000 mm: +15/0 mm
EN 10025(Hot-Rolled)	Typically follows EN 10210 for hollow sections or specific product standards (e.g., EN 10056 for angles/EN 10279 for channels).	Generally ±10% (varies by specific section profile)	Standard:+100 mm / −0 mm (unless specified)

Structural Steel Pipe Standards Comparison

		Chemical Components (%)				Mechanical Properties		Impact Test
Standard	Grade	C (%) max	Mn (%) max	P (%) max	S (%) max	Yield Strength (MPa) min	Tensile Strength (MPa) min	CVN Impact Energy (J) min
ASTM A500	Grade A	0.26	-	0.035	0.035	270	310	Not Required
	Grade B	0.26	-	0.035	0.035	315	400	Not Required
	Grade C	0.23	1.35	0.035	0.035	345	425	Not Required
EN 10219	S235JRH	0.17	1.4	0.04	0.04	235	360 – 510	27 J @ 20°C
	S275J0H	0.2	1.5	0.035	0.035	275	410 – 560	27 J @ 0°C
	S275J2H	0.2	1.5	0.03	0.03	275	410 – 560	27 J @ −20°C
	S355J0H	0.22	1.6	0.035	0.035	355	470 – 630	27 J @ 0°C
	S355J2H	0.22	1.6	0.03	0.03	355	470 – 630	27 J @ −20°C
EN 10210	S235JRH	0.17	1.4	0.035	0.035	235	360 – 510	27 J @ 20°C
	S275J0H	0.2	1.5	0.03	0.03	275	410 – 560	27 J @ 0°C
	S355J2H	0.22	1.6	0.025	0.025	355	470 – 630	27 J @ −20°C
	S355NH	0.2	0.90–1.65	0.03	0.025	355	470 – 630	40 J @ −20°C
EN 10025-2	S235JR	0.17	1.4	0.035	0.035	235	360 – 510	27 J @ 20°C
	S275JR	0.21	1.5	0.035	0.035	275	410 – 560	27 J @ 20°C
	S355JR	0.24	1.6	0.035	0.035	355	470 – 630	27 J @ 20°C
	S355K2	0.2	1.6	0.025	0.025	355	470 – 630	40 J @ −20°C

Square And Rectangular Tube Production Process

Frequently Asked Questions

1. What specific types of hollow sections do you supply?

We offer a full range of Hollow Sections, including Square (SHS), Rectangular (RHS), and Circular (CHS) profiles, suitable for both structural and decorative applications.

2. Which international standards and steel grades are available?

Our hollow sections are manufactured to strict global standards such as EN 10219 (S235JR, S355JR) and ASTM A500, ensuring the high structural reliability required for construction and engineering projects.

3. Do you provide surface treatments to prevent rust?

We can provide hollow sections with various surface finishes, including Hot-Dipped Galvanized, Pre-galvanized, or Primer Painting, to protect against corrosion in outdoor or high-moisture environments.

4. How do you ensure the dimensional accuracy of the hollow sections?

Every batch undergoes strict Internal Quality Control, where we verify wall thickness, outer diameter, and straightness to ensure they meet your exact project tolerances before leaving our facility.