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Rectangular Hollow Section

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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 SizesWeightHeightWidthW. T.
[kg/m][mm][mm][mm]
50 x 25 x 2.5 RHS2.750252.5
50 x 25 x 2.5 RHS2.750252.5
50 x 25 x 3 RHS3.250253
50 x 30 x 2.5 RHS2.950302.5
50 x 30 x 3 RHS3.450303
50 x 30 x 3.2 RHS3.650303.2
50 x 30 x 3.6 RHS450303.6
50 x 30 x 4 RHS4.450304
50 x 30 x 5 RHS5.350305
60 x 40 x 2.5 RHS3.760402.5
60 x 40 x 3 RHS4.460403
60 x 40 x 3.2 RHS4.660403.2
60 x 40 x 3.6 RHS5.160403.6
60 x 40 x 4 RHS5.660404
60 x 40 x 5 RHS6.960405
60 x 40 x 6 RHS860406
60 x 40 x 6.3 RHS8.360406.3
80 x 40 x 3 RHS5.380403
80 x 40 x 3.2 RHS5.680403.2
80 x 40 x 3.6 RHS6.380403.6
80 x 40 x 4 RHS6.980404
80 x 40 x 5 RHS8.480405
80 x 40 x 6 RHS9.980406
80 x 40 x 6.3 RHS10.380406.3
80 x 40 x 8 RHS12.580408
90 x 50 x 3 RHS6.290503
90 x 50 x 3.2 RHS6.690503.2
90 x 50 x 3.6 RHS7.490503.6
90 x 50 x 4 RHS8.290504
90 x 50 x 5 RHS1090505
90 x 50 x 6 RHS11.890506
90 x 50 x 6.3 RHS12.390506.3
90 x 50 x 8 RHS1590508
100 x 50 x 3 RHS6.7100503
100 x 50 x 3.2 RHS7.1100503.2
100 x 50 x 3.6 RHS8100503.6
100 x 50 x 4 RHS8.8100504
100 x 50 x 5 RHS10.8100505
100 x 50 x 6 RHS12.7100506
100 x 50 x 6.3 RHS13.3100506.3
100 x 50 x 8 RHS16.3100508
100 x 60 x 3 RHS7.2100603
100 x 60 x 3.2 RHS7.6100603.2
100 x 60 x 3.6 RHS8.5100603.6
100 x 60 x 4 RHS9.4100604
100 x 60 x 5 RHS11.6100605
100 x 60 x 6 RHS13.6100606
100 x 60 x 6.3 RHS14.2100606.3
100 x 60 x 8 RHS17.5100608
120 x 60 x 3.6 RHS9.7120603.6
120 x 60 x 4 RHS10.7120604
120 x 60 x 5 RHS13.1120605
120 x 60 x 6 RHS15.5120606
120 x 60 x 6.3 RHS16.2120606.3
120 x 60 x 8 RHS20.1120608
120 x 60 x 10 RHS24.61206010
120 x 80 x 3.6 RHS10.8120803.6
120 x 80 x 4 RHS11.9120804
120 x 80 x 5 RHS14.7120805
120 x 80 x 6 RHS17.4120806
120 x 80 x 6.3 RHS18.2120806.3
120 x 80 x 8 RHS22.6120808
120 x 80 x 10 RHS27.41208010
140 x 80 x 4 RHS13.2140804
140 x 80 x 5 RHS16.3140805
140 x 80 x 6 RHS19.3140806
140 x 80 x 6.3 RHS20.2140806.3
140 x 80 x 8 RHS25.1140808
140 x 80 x 10 RHS30.61408010
150 x 100 x 4 RHS15.11501004
150 x 100 x 5 RHS18.61501005
150 x 100 x 6 RHS22.11501006
150 x 100 x 6.3 RHS23.11501006.3
150 x 100 x 8 RHS28.91501008
150 x 100 x 10 RHS35.315010010
150 x 100 x 12 RHS41.415010012
150 x 100 x 12.5 RHS42.815010012.5
160 x 80 x 4 RHS14.4160804
160 x 80 x 5 RHS17.8160805
160 x 80 x 6 RHS21.2160806
160 x 80 x 6.3 RHS22.2160806.3
160 x 80 x 8 RHS27.6160808
160 x 80 x 10 RHS33.71608010
160 x 80 x 12 RHS39.51608012
160 x 80 x 12.5 RHS40.9|1608012.5
180 x 100 x 4 RHS16.91801004
180 x 100 x 5 RHS211801005
180 x 100 x 6 RHS24.91801006
180 x 100 x 6.3 RHS26.11801006.3
180 x 100 x 8 RHS32.61801008
180 x 100 x 10 RHS4018010010
180 x 100 x 12 RHS4718010012
180 x 100 x 12.5 RHS48.718010012.5
200 x 100 x 4 RHS18.12001004
200 x 100 x 5 RHS22.62001005
200 x 100 x 6 RHS26.82001006
200 x 100 x 6.3 RHS28.12001006.3
200 x 100 x 8 RHS35.12001008
200 x 100 x 10 RHS43.120010010
200 x 100 x 12 RHS50.820010012
200 x 100 x 12.5 RHS52.720010012.5
200 x 100 x 16 RHS65.220010016
200 x 120 x 6 RHS28.72001206
200 x 120 x 6.3 RHS29.92001206.3
200 x 120 x 8 RHS37.32001208
200 x 120 x 10 RHS45.920012010
200 x 120 x 12 RHS54.520012012
200 x 120 x 12.5 RHS55.720012012.5
250 x 150 x 5 RHS30.42501505
250 x 150 x 6 RHS36.22501506
250 x 150 x 6.3 RHS38|2501506.3
250 x 150 x 8 RHS47.72501508
250 x 150 x 10 RHS58.825015010
250 x 150 x 12 RHS69.625015012
250 x 150 x 12.5 RHS72.325015012.5
250 x 150 x 16 RHS90.325015016
260 x 180 x 6 RHS402601806
260 x 180 x 6.3 RHS41.92601806.3
260 x 180 x 8 RHS52.72601808
260 x 180 x 10 RHS65.126018010
260 x 180 x 12 RHS77.226018012
260 x 180 x 12.5 RHS80.126018012.5
260 x 180 x 16 RHS10026018016
300 x 200 x 5 RHS38.33002005
300 x 200 x 6 RHS45.73002006
300 x 200 x 6.3 RHS47.93002006.3
300 x 200 x 8 RHS60.33002008
300 x 200 x 10 RHS74.530020010
300 x 200 x 12 RHS88.530020012
300 x 200 x 12.5 RHS91.930020012.5
300 x 200 x 16 RHS11530020016
350 x 250 x 6 RHS55.13502506
350 x 250 x 6.3 RHS57.83502506.3
350 x 250 x 8 RHS72.83502508
350 x 250 x 10 RHS90.235025010
350 x 250 x 12 RHS107|35025012
350 x 250 x 12.5 RHS11235025012.5
350 x 250 x 16 RHS14135025016
400 x 200 x 6 RHS55.14002006
400 x 200 x 6.3 RHS57.84002006.3
400 x 200 x 8 RHS72.84002008
400 x 200 x 10 RHS90.240020010
400 x 200 x 12 RHS10740020012
400 x 200 x 12.5 RHS11240020012.5
400 x 200 x 16 RHS14140020016
450 x 250 x 8 RHS85.44502508
450 x 250 x 10 RHS10645025010
450 x 250 x 12 RHS12645025012
450 x 250 x 12.5 RHS13145025012.5
450 x 250 x 16 RHS16645025016
500 x 300 x 8 RHS97.95003008
500 x 300 x 10 RHS12250030010
500 x 300 x 12 RHS14550030012
500 x 300 x 12.5 RHS15150030012.5
500 x 300 x 16 RHS19150030016
500 x 300 x 20 RHS23550030020

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 strength, 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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