Rectangular Hollow Section

rectangular hollow sections

What is Rectangular Hollow Section?

A rectangular hollow section, also known as RHS steel, is a type of steel pipe that is characterized by its rectangular cross-sectional shape. RHS steel is often used in construction and engineering, as it provides good structural support. It can also be galvanized, which means that it has been coated with a thin layer of zinc to protect it from corrosion. Rectangular hollow section steel is available in a variety of sizes and thicknesses, making it a versatile material for a wide range of applications.

Table of Contents

Application of Rectangular Hollow Section

Rectangular Hollow Section (RHS) has intrinsically flat surfaces, which makes joining and manufacturing cheaper. It is widely used in machinery manufacturing, construction industry, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railway, highway guardrail, container skeleton, furniture, decoration, and steel structure.

Appearance of Rectangular Hollow Section

The pipe’s external and inner surfaces must be smooth, devoid of fissures, cracks, material overlay, and non-metallic impurities. Small scratches, dents, a thin layer of welding cinder, or traces left after cleaning manufacturing flaws are permitted, as long as the wall thickness does not fall below the minimum authorized limitations. The weld shall be compact and continuous, and shall not have cracks or other defects that reduce the weld resistance under the resistance of the base metal.

The welding seam’s external ledge is eliminated. Thickening of the seam is acceptable within the range of authorized diameter restrictions. The welding seam’s inside burr is not eliminated. Unevenness on the metal strip’s borders in the welding seam is not permitted. The pipe’s ends must be cut perpendicular to its axis. It is permissible to have a burr on the pipe ends as a result of the cutting operation. Pipe end deformation is not permitted.

Dimensions and Sizes of Rectangular Hollow Section

Rectangular Hollow Section Sizes Weight Height Width W. T.
[kg/m] [mm] [mm] [mm]
50 x 25 x 2.5 RHS 2.7 50 25 2.5
50 x 25 x 2.5 RHS 2.7 50 25 2.5
50 x 25 x 3 RHS 3.2 50 25 3
50 x 30 x 2.5 RHS 2.9 50 30 2.5
50 x 30 x 3 RHS 3.4 50 30 3
50 x 30 x 3.2 RHS 3.6 50 30 3.2
50 x 30 x 3.6 RHS 4 50 30 3.6
50 x 30 x 4 RHS 4.4 50 30 4
50 x 30 x 5 RHS 5.3 50 30 5
60 x 40 x 2.5 RHS 3.7 60 40 2.5
60 x 40 x 3 RHS 4.4 60 40 3
60 x 40 x 3.2 RHS 4.6 60 40 3.2
60 x 40 x 3.6 RHS 5.1 60 40 3.6
60 x 40 x 4 RHS 5.6 60 40 4
60 x 40 x 5 RHS 6.9 60 40 5
60 x 40 x 6 RHS 8 60 40 6
60 x 40 x 6.3 RHS 8.3 60 40 6.3
80 x 40 x 3 RHS 5.3 80 40 3
80 x 40 x 3.2 RHS 5.6 80 40 3.2
80 x 40 x 3.6 RHS 6.3 80 40 3.6
80 x 40 x 4 RHS 6.9 80 40 4
80 x 40 x 5 RHS 8.4 80 40 5
80 x 40 x 6 RHS 9.9 80 40 6
80 x 40 x 6.3 RHS 10.3 80 40 6.3
80 x 40 x 8 RHS 12.5 80 40 8
90 x 50 x 3 RHS 6.2 90 50 3
90 x 50 x 3.2 RHS 6.6 90 50 3.2
90 x 50 x 3.6 RHS 7.4 90 50 3.6
90 x 50 x 4 RHS 8.2 90 50 4
90 x 50 x 5 RHS 10 90 50 5
90 x 50 x 6 RHS 11.8 90 50 6
90 x 50 x 6.3 RHS 12.3 90 50 6.3
90 x 50 x 8 RHS 15 90 50 8
100 x 50 x 3 RHS 6.7 100 50 3
100 x 50 x 3.2 RHS 7.1 100 50 3.2
100 x 50 x 3.6 RHS 8 100 50 3.6
100 x 50 x 4 RHS 8.8 100 50 4
100 x 50 x 5 RHS 10.8 100 50 5
100 x 50 x 6 RHS 12.7 100 50 6
100 x 50 x 6.3 RHS 13.3 100 50 6.3
100 x 50 x 8 RHS 16.3 100 50 8
100 x 60 x 3 RHS 7.2 100 60 3
100 x 60 x 3.2 RHS 7.6 100 60 3.2
100 x 60 x 3.6 RHS 8.5 100 60 3.6
100 x 60 x 4 RHS 9.4 100 60 4
100 x 60 x 5 RHS 11.6 100 60 5
100 x 60 x 6 RHS 13.6 100 60 6
100 x 60 x 6.3 RHS 14.2 100 60 6.3
100 x 60 x 8 RHS 17.5 100 60 8
120 x 60 x 3.6 RHS 9.7 120 60 3.6
120 x 60 x 4 RHS 10.7 120 60 4
120 x 60 x 5 RHS 13.1 120 60 5
120 x 60 x 6 RHS 15.5 120 60 6
120 x 60 x 6.3 RHS 16.2 120 60 6.3
120 x 60 x 8 RHS 20.1 120 60 8
120 x 60 x 10 RHS 24.6 120 60 10
120 x 80 x 3.6 RHS 10.8 120 80 3.6
120 x 80 x 4 RHS 11.9 120 80 4
120 x 80 x 5 RHS 14.7 120 80 5
120 x 80 x 6 RHS 17.4 120 80 6
120 x 80 x 6.3 RHS 18.2 120 80 6.3
120 x 80 x 8 RHS 22.6 120 80 8
120 x 80 x 10 RHS 27.4 120 80 10
140 x 80 x 4 RHS 13.2 140 80 4
140 x 80 x 5 RHS 16.3 140 80 5
140 x 80 x 6 RHS 19.3 140 80 6
140 x 80 x 6.3 RHS 20.2 140 80 6.3
140 x 80 x 8 RHS 25.1 140 80 8
140 x 80 x 10 RHS 30.6 140 80 10
150 x 100 x 4 RHS 15.1 150 100 4
150 x 100 x 5 RHS 18.6 150 100 5
150 x 100 x 6 RHS 22.1 150 100 6
150 x 100 x 6.3 RHS 23.1 150 100 6.3
150 x 100 x 8 RHS 28.9 150 100 8
150 x 100 x 10 RHS 35.3 150 100 10
150 x 100 x 12 RHS 41.4 150 100 12
150 x 100 x 12.5 RHS 42.8 150 100 12.5
160 x 80 x 4 RHS 14.4 160 80 4
160 x 80 x 5 RHS 17.8 160 80 5
160 x 80 x 6 RHS 21.2 160 80 6
160 x 80 x 6.3 RHS 22.2 160 80 6.3
160 x 80 x 8 RHS 27.6 160 80 8
160 x 80 x 10 RHS 33.7 160 80 10
160 x 80 x 12 RHS 39.5 160 80 12
160 x 80 x 12.5 RHS 40.9 |160 80 12.5
180 x 100 x 4 RHS 16.9 180 100 4
180 x 100 x 5 RHS 21 180 100 5
180 x 100 x 6 RHS 24.9 180 100 6
180 x 100 x 6.3 RHS 26.1 180 100 6.3
180 x 100 x 8 RHS 32.6 180 100 8
180 x 100 x 10 RHS 40 180 100 10
180 x 100 x 12 RHS 47 180 100 12
180 x 100 x 12.5 RHS 48.7 180 100 12.5
200 x 100 x 4 RHS 18.1 200 100 4
200 x 100 x 5 RHS 22.6 200 100 5
200 x 100 x 6 RHS 26.8 200 100 6
200 x 100 x 6.3 RHS 28.1 200 100 6.3
200 x 100 x 8 RHS 35.1 200 100 8
200 x 100 x 10 RHS 43.1 200 100 10
200 x 100 x 12 RHS 50.8 200 100 12
200 x 100 x 12.5 RHS 52.7 200 100 12.5
200 x 100 x 16 RHS 65.2 200 100 16
200 x 120 x 6 RHS 28.7 200 120 6
200 x 120 x 6.3 RHS 29.9 200 120 6.3
200 x 120 x 8 RHS 37.3 200 120 8
200 x 120 x 10 RHS 45.9 200 120 10
200 x 120 x 12 RHS 54.5 200 120 12
200 x 120 x 12.5 RHS 55.7 200 120 12.5
250 x 150 x 5 RHS 30.4 250 150 5
250 x 150 x 6 RHS 36.2 250 150 6
250 x 150 x 6.3 RHS 38 |250 150 6.3
250 x 150 x 8 RHS 47.7 250 150 8
250 x 150 x 10 RHS 58.8 250 150 10
250 x 150 x 12 RHS 69.6 250 150 12
250 x 150 x 12.5 RHS 72.3 250 150 12.5
250 x 150 x 16 RHS 90.3 250 150 16
260 x 180 x 6 RHS 40 260 180 6
260 x 180 x 6.3 RHS 41.9 260 180 6.3
260 x 180 x 8 RHS 52.7 260 180 8
260 x 180 x 10 RHS 65.1 260 180 10
260 x 180 x 12 RHS 77.2 260 180 12
260 x 180 x 12.5 RHS 80.1 260 180 12.5
260 x 180 x 16 RHS 100 260 180 16
300 x 200 x 5 RHS 38.3 300 200 5
300 x 200 x 6 RHS 45.7 300 200 6
300 x 200 x 6.3 RHS 47.9 300 200 6.3
300 x 200 x 8 RHS 60.3 300 200 8
300 x 200 x 10 RHS 74.5 300 200 10
300 x 200 x 12 RHS 88.5 300 200 12
300 x 200 x 12.5 RHS 91.9 300 200 12.5
300 x 200 x 16 RHS 115 300 200 16
350 x 250 x 6 RHS 55.1 350 250 6
350 x 250 x 6.3 RHS 57.8 350 250 6.3
350 x 250 x 8 RHS 72.8 350 250 8
350 x 250 x 10 RHS 90.2 350 250 10
350 x 250 x 12 RHS 107 |350 250 12
350 x 250 x 12.5 RHS 112 350 250 12.5
350 x 250 x 16 RHS 141 350 250 16
400 x 200 x 6 RHS 55.1 400 200 6
400 x 200 x 6.3 RHS 57.8 400 200 6.3
400 x 200 x 8 RHS 72.8 400 200 8
400 x 200 x 10 RHS 90.2 400 200 10
400 x 200 x 12 RHS 107 400 200 12
400 x 200 x 12.5 RHS 112 400 200 12.5
400 x 200 x 16 RHS 141 400 200 16
450 x 250 x 8 RHS 85.4 450 250 8
450 x 250 x 10 RHS 106 450 250 10
450 x 250 x 12 RHS 126 450 250 12
450 x 250 x 12.5 RHS 131 450 250 12.5
450 x 250 x 16 RHS 166 450 250 16
500 x 300 x 8 RHS 97.9 500 300 8
500 x 300 x 10 RHS 122 500 300 10
500 x 300 x 12 RHS 145 500 300 12
500 x 300 x 12.5 RHS 151 500 300 12.5
500 x 300 x 16 RHS 191 500 300 16
500 x 300 x 20 RHS 235 500 300 20

Chemical composition of Rectangular Hollow Section

Chemical Requirements
  Element Composition, %
Grades A, B, and D Grade C
Heat Analysis Product Analysis Heat Analysis Product Analysis
Carbon, max A 0.26 0.30 0.23 0.27
Manganese, max A 1.35 1.40 1.35 1.40
Phosphorus, max 0.035 0.045 0.035 0.045
Sulfur, max 0.035 0.045 0.035 0.045
Copper, min B 0.20 0.18 0.20 0.18

Mechanical property of Rectangular Hollow Section

Item Grade A Grade B Grade C Grade D
Tensile Strength, mn, ps (MPa) 45 000
(310)
58 000
(400)
62 00
(427)
58 000
(400)
Yield Sstrength, mn, psi (MPa) 39 000
(269)
46 000
(317)
50 000
(345)
36 000
(250)
Elongation in 2 in. (50.8 mm), min, %A 25B 23C 21D 23C

Regular Tolerance of Rectangular Hollow Section

Length

+/- 50 mm

Wall Thickness

+/-  12.5 %

Weight

+/-  8 %

Delivery Conditions of Rectangular Hollow Section

After cold rolling, the steel plates are left untreated. On both the external and internal surfaces, emulsion tracks and tiny oxidation tracks may emerge. On the external surfaces of the sections, an oil coating provides provisional corrosion protection. On request, one may withdraw this form of protection.

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