Carbon Steel Hollow Sections

Forever Steel Manufacturing Co., Ltd
carbon steel hollow sections、structural hollow sections、square steel tube、rectangular steel tube、HSS steel、hollow section sizes、ASTM A500 tubing、EN 10219 hollow sections

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Carbon Steel Hollow Sections

High-Strength Carbon Steel Hollow Sections
Square hollow section SHS ASTM A500 for structural steel frames
Cold formed welded square steel tubing for furniture and racking
Perfiles tubulares cuadrados y rectangulares de acero estructural
Hot rolled large size rectangular hollow sections for bridges

Products: Square Hollow Section(SHS),Rectangular Hollow Section (RHS)

Outer Diameter: 20*20-1200*1200mm or accept customisation

Wall Thickness: 0.5-60mm or accept customisation

Length: 0.5-26.5 m or cut to required length

Tolerance: ±5% or as requirement

R-angle: Accept customisation

Surface Treatment: bare,oiled,painted,galvanized,etc.

Standards: ASTM A500/ASTM A501,ASTM A513,ASTM A53,ASTM A106,ASTM A572,ASTM A992,EN10219,EN10210,JIS G3466,AS1153,etc.

Grade: Gr.A/B/C,S235/275/355/420/460,A36,SS400,Q195/235/355,STKR400/490,300W/350W

  • Overview
  • Specification
  • Standard
  • Process
  • FAQ

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 SHS, RHS and CHS for structural frames and fabrication under ASTM A500, EN 10219, EN 10210 and other project specifications. Confirm profile, dimensions, wall thickness, grade, length, finish, tolerances and inspection documents before quotation.

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.



On this page:
Size range | Standards and grades | SHS, RHS and CHS selection | RFQ checklist

1. Comprehensive Dimensional Range

Specify the required profile, outside dimensions, wall thickness and length within the supply scope below. Final availability depends on the dimensions, grade, production route and order quantity.

Square and rectangular hollow sections (SHS/RHS): outside-size supply envelope from 20 x 20 mm to 1200 x 1200 mm; customised dimensions are subject to specification review.

For RHS, specify the required width x height combination. The overall size envelope does not mean every rectangular combination is available.

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

Wall Thickness (W.T.): 0.5 mm to 60 mm; customised thickness is subject to specification review. Length: 0.5 m to 26.5 m, or cut to the required length. Confirm the outside-size x wall-thickness x grade combination before quotation; maximum size and maximum wall thickness should not be assumed to apply together.


2. Global Standards & Material Compliance


Available production can be supplied against the following structural standards when the requested profile, grade, dimensions, delivery condition and inspection scope are confirmed:

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. SHS, RHS and CHS Selection Guide

Select the profile from the load path, connection detail, exposed surface and fabrication method. Section shape alone does not establish structural capacity; the engineer should use the section properties and design thickness applicable to the ordered standard, grade and production route.

Profile Typical selection reason Confirm before approval
SHS — square hollow section Balanced geometry for columns, frames, posts and fabricated members where similar behavior about both principal axes is useful. Outside size, corner radius, wall thickness, section properties, connection face and weld access.
RHS — rectangular hollow section Useful when bending demand differs by axis or a wider face is needed for beams, rails, machinery frames and connections. Member orientation, major/minor-axis properties, local connection loads, flat-face width and distortion control.
CHS — circular hollow section Uniform geometry for columns, bracing, exposed structures and members subject to multi-directional loading or fluid/aerodynamic exposure. OD, wall thickness, ovality, end preparation, connection detail and rolling/forming feasibility.

Nominal wall, design wall and section-property checks

  • State whether calculations use nominal wall thickness, a standard-defined design wall, or measured minimum wall thickness.
  • Request the applicable section-property source: area, mass, second moment of area, radius of gyration, elastic/plastic section modulus and torsional properties where relevant.
  • Confirm dimensional tolerances, corner radii and weld-seam location because they can affect fit-up, connections and calculated properties.
  • Do not substitute ASTM A500, EN 10219, EN 10210 or another standard solely by matching outside dimensions; grade designation, delivery condition, tolerances and test requirements differ.

Inspection evidence for structural hollow sections

Buyer decision Evidence to request
Material and grade MTC linked to heat/coil and finished bundles; chemical and mechanical results for the ordered standard and grade.
Dimensions and fit-up Outside dimensions, wall thickness, length, straightness, twist, concavity/convexity, corner profile or ovality records as applicable.
Welded product acceptance Manufacturing route, weld-seam inspection and any NDT or mechanical-test records required by the governing standard, purchase order and ITP.
Surface and fabrication Bare/primed/galvanized condition, coating mass or DFT when specified, vent/drain-hole plan, repair method and fabrication drawings.

RFQ checklist

Include profile (SHS/RHS/CHS), standard and edition, grade/delivery condition, outside dimensions, nominal wall thickness, required design basis or section properties, length, quantity, tolerances, end condition, surface treatment, fabrication scope, marking, packing, MTC type, inspection plan and third-party witness requirements.

The published dimensional range is a quotation starting point, not confirmation that every profile, wall thickness, grade and standard combination is available. Final feasibility is confirmed against the requested section, manufacturing route and inspection requirements.

6. 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 1.4 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

Square and rectangular carbon steel hollow sections can be produced by welded or seamless routes. Welded sections contain a longitudinal weld; seamless sections are shaped from a seamless mother tube without a longitudinal welded seam. Confirm the manufacturing method, delivery condition and available size-and-grade combination when ordering.

1. Welded Square and Rectangular Tube Production

The diagram shows a typical cold-formed, round-to-square welded route. Direct forming is another welded route: the strip is shaped into an open square or rectangular profile before welding.

Welded square and rectangular tube production process

1. Coil Inspection and Strip Preparation: Review coil identity, certificates, width, thickness and surface condition. Uncoil and level the strip, prepare the edges and join strip ends as required for continuous feeding.

2. Forming and Longitudinal Welding: In the round-to-square route, rolls form the strip into a round tube before high-frequency welding closes the longitudinal seam. Remove the weld bead to the specified profile. Direct-forming lines shape the section before welding instead.

3. Square or Rectangular Shaping: Profile rolls reshape the welded round tube into SHS or RHS. Control side dimensions, corner geometry and weld position; specify any heat treatment according to the standard and delivery condition.

4. Sizing, Straightening and Cutting: Size and straighten the section, cut to the ordered length and finish the ends. Check squareness, twist, straightness and dimensional tolerances.

2. Seamless Square and Rectangular Tube Production

The diagram illustrates a typical hot-formed seamless route beginning with a solid billet. Other qualified routes can use a purchased seamless mother tube and cold forming or drawing; the approved procedure and final delivery condition determine the actual sequence.

Seamless square and rectangular tube production process

1. Billet Preparation and Heating: Verify the solid billet grade, identity and condition. Heat the billet to the controlled working temperature for the selected seamless-tube manufacturing route.

2. Seamless Mother-Tube Production: For the illustrated rotary-piercing route, pierce the heated billet into a hollow shell and roll it to the required mother-tube dimensions. The hollow is formed without closing a longitudinal weld seam.

3. Square or Rectangular Forming: Shape the seamless mother tube using the approved hot-forming or cold-working route. Control wall distribution, corner geometry and side dimensions during shaping.

4. Heat Treatment and Finishing: Apply the required thermal treatment and cooling procedure for the grade and delivery condition. Complete sizing, straightening, cutting and end finishing in the sequence defined by the manufacturing procedure.

Final Inspection and Delivery for Both Routes

Dimensions and Surface Quality: Inspect outside dimensions, wall thickness, corner radii, squareness, twist, straightness, length and surface condition against the applicable acceptance criteria.

Testing and Traceability: Perform the material tests and NDT specified by the standard and order. Welded-seam inspection applies to the welded route; pressure testing is not universal for structural hollow sections. Maintain heat and lot traceability through the inspection records.

Protection, Marking and Packing: Apply the specified coating or temporary protection, verify marking and documents, then bundle and support the sections to limit handling damage.

Before ordering: State welded or seamless, SHS or RHS, dimensions, wall thickness, grade, standard and edition, hot-finished or cold-formed condition, length, tolerances, finish and inspection documents. Hot-finished and seamless are separate characteristics; one does not automatically establish the other.

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.

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