Rectangular Hollow Section

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.

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.
Rectangular Hollow Section Sizes	[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 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	25^B	23^C	21^D	23^C

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.