Steel tubes (structural) and pipes (conveyance) are hollow sections available in seamless or welded forms. Seamless tubes (rolled from solid billets) offer higher pressure ratings and uniformity, while ERW/LSAW pipes (formed from plates/coils) provide cost-effective large-diameter solutions. Structural tubes (square, rectangular, circular) carry axial, bending and torsional loads in frameworks; pipes transport fluids and gases under pressure. Surface finishes range from black/galvanized to epoxy-coated or lined.

Applications

Fluid transport: Water, oil, gas and steam pipelines in utilities, petrochemical and process industries
Structural frameworks: Columns, trusses and mezzanine supports in warehouses and industrial buildings
Mechanical systems: Hydraulic cylinders, pneumatic lines and heat-exchanger tubing
Scaffolding & railing: Modular scaffold systems and safety railings on construction sites

Types of Steel Pipes

Round Steel Pipes

Round steel tubes are hollow, cylindrical sections produced either by electric resistance welding (ERW) or seamless forging. Their uniform geometry provides excellent torsional strength and consistent flow characteristics, making them ideal for applications such as hydraulic lines, scaffolding, handrails, and automotive components. Round tubes are also prized for their aesthetic appeal in architectural and decorative uses, thanks to smooth curves and ease of finishing. Their seamless variants offer higher pressure ratings, while welded versions deliver cost-effective solutions for medium-duty structural needs.

Square Steel Pipes

Square steel tubes feature a uniform wall thickness and a square cross-section, combining high bending stiffness with a clean, angular look. Manufactured via ERW or cold-forming processes, they provide excellent load-bearing capacity in both in-plane and out-of-plane directions, making them suitable for structural frames, furniture, fencing, and general fabrication work. The flat faces simplify welding, drilling, and attachment of plates or connectors, while the sharp corners offer greater resistance to torsion compared to round tubes of similar cross-sectional area.

Rectangular Steel Pipes

Rectangular steel tubes are elongated hollow sections with differing width and height dimensions, delivering directional strength that can be tailored to specific load requirements. Their rectangular profile makes them especially effective for beams, columns, conveyor frames, and gantry structures where one axis bears higher bending moments. Produced primarily by ERW, these tubes combine light weight with high rigidity and ease of integration into welded assemblies. They’re widely used in construction, machinery frames, and material-handling equipment due to their versatility and efficient material usage.

For more detailed information on our grades and specifications, please visit our Grades & Specifications page.

Grades & Specifications

Tubes and Pipes Weight Chart

Nominal Bore (NB) (mm)	Outer Diameter (OD) (mm)	Thickness (mm)	Section Weight (kg/m)
15	21.3	1.8	0.866
15	21.3	2	0.952
15	21.3	2.6	1.2
15	21.3	3.2	1.43
15	21.3	4	1.71
20	26.9	1.8	1.11
20	26.9	2	1.23
20	26.9	2.3	1.4
20	26.9	2.6	1.56
20	26.9	3.2	1.87
20	26.9	4	2.26
25	33.7	2	1.56
25	33.7	2.3	1.78
25	33.7	2.6	1.99
25	33.7	3.2	2.41
25	33.7	4	2.93
25	33.7	4.5	3.24
32	42.4	3.2	3
32	42.4	2.3	2.27
32	42.4	2.6	2.55
32	42.4	3.2	3.09
32	42.4	3.6	3.44
32	42.4	4	3.79
32	42.4	5	4.61
32	42.4	5.4	4.93
40	48.3	2.3	2.61
40	48.3	2.6	2.93
40	48.3	2.9	3.25
40	48.3	3.2	3.56
40	48.3	4	4.37
40	48.3	4.9	5.23
40	48.3	5	5.34
40	48.3	5.6	5.9
40	48.3	5.9	6.16
50	60.3	2.3	3.29
50	60.3	2.6	3.7
50	60.3	2.9	4.11
50	60.3	3.2	4.51
50	60.3	3.6	5.03
50	60.3	4	5.55
50	60.3	4.5	6.19
50	60.3	5	6.82
50	60.3	5.6	7.55
50	60.3	6.3	8.39
50	63.5	3.65	5.39
50	63.5	4.05	5.94
50	63.5	4.5	6.55
50	63.5	4.85	7.01
50	63.5	5.4	7.74
50	63.5	6.3	8.89
65	76.1	2.9	5.24
65	76.1	2.6	5.24
65	76.1	3.2	5.75
65	76.1	3.6	6.44
65	76.1	4	7.11
65	76.1	4.5	7.95
65	76.1	5	8.78
65	76.1	3.65	6.52
65	76.1	4.05	7.2
65	76.1	4.85	8.52
65	76.1	5.4	9.42
65	76.1	6.3	10.84
80	88.9	4.8	9
80	88.9	2.9	6.15
80	88.9	3.2	6.76
80	88.9	4	8.38
80	88.9	5	10.3
80	88.9	5.4	9.42
80	88.9	5.6	11.5
80	88.9	6.3	10.8
80	88.9	7.1	12.1
80	88.9	4.05	8.74
80	88.9	4.5	9.37
80	88.9	4.85	10.05
80	88.9	5.4	11.12
80	88.9	6.3	12.83
90	101.6	3.6	8.7
90	101.6	4	9.63
90	101.6	4.8	11.46
100	114.3	3.6	9.83
100	114.3	4.5	12.19
100	114.3	5	13.48
100	101.6	4.05	9.74
100	101.6	4.5	10.78
100	101.6	4.85	11.57
100	114.3	4.85	13.09
100	114.3	5.4	14.5
100	114.3	6.3	13.59
110	127	4.5	13.59
110	127	4.8	14.47
110	127	5.4	16.19
110	114.3	4.5	12.19
110	127	5.4	18.75
110	127	6.3	15
125	139.7	4.5	15
125	139.7	4.8	15.97
125	141.3	5	16.8
125	141.3	5.4	18.1
125	141.3	7.1	23.5
125	127	4.5	14.61
125	127	4.85	16.19
125	133	4.5	14.3
125	133	4.85	15.33
125	133	5.4	16.99
125	139.7	5.4	17.89
125	139.7	6.3	20.73
135	152.4	4.5	16.41
135	152.4	4.8	17.47
135	152.4	5.4	19.58
135	139.7	4.5	15
135	139.7	4.85	16.13
135	152.4	6.3	22.7
150	165.1	4.8	18.98
150	165.1	5.9	23.2
150	168.3	4.8	19.35
150	168.3	6.3	25.17
150	168.3	5	20.13
150	168.3	5.4	21.6
150	168.3	7.1	28.2
150	168.3	2.6	10.6
150	168.3	3.2	13
150	168.3	4	16.2
150	168.3	4.5	18.2
150	168.3	5	20.1
150	168.3	6.3	25.2
150	152.4	4.5	16.41
150	152.4	4.85	17.65
150	152.4	5.4	19.58
150	159	4.5	17.15
150	159	4.85	20.46
150	159	5.4	18.44
150	159	6.3	23.72
150	165.1	4.5	17.82
150	165.1	4.85	19.17
150	165.1	5.4	21.27
150	165.1	6.3	24.67
150	168.3	4.5	18.18
150	168.3	4.85	19.55
150	168.3	5.4	21.69
150	168.3	6.3	25.69
175	193.7	4.8	22.36
175	193.7	5.9	27.33
175	193.7	5.4	25.1
175	193.7	6.4	29.6
175	193.7	8	36.6
175	193.7	2.6	12.3
175	193.7	3.6	16.9
175	193.7	4.5	21
175	193.7	6.3	29.1
175	193.7	5.4	25.08
175	193.7	6.3	29.12
200	219.1	4.8	25.37
200	219.1	5.6	29.49
200	219.1	5.9	31.02
200	219.1	8	41.65
200	219.1	10	51.57
200	219.1	8	33.6
200	219.1	10	41.6
200	219.1	2.6	23.8
200	219.1	3.6	33.1
200	219.1	4.5	23.8
200	219.1	6.3	33.1
200	219.1	5.4	28.46
200	219.1	6.3	33.06
250	273	5.9	38.86
250	273	6.3	41.44
250	273	8	52.28
250	273	10	64.86
250	273.1	7.1	46.57
250	273.1	8	52.3
250	273.1	10	64.9
250	273	3.6	23.9
250	273	4	26.5
250	273	5	33.9
250	273	6.3	41.4
250	273	7.1	46.57
250	273	8	52.3
250	273	10	64.9
300	323.9	6.3	49.34
300	323.9	8	62.32
300	323.9	10	77.41
300	323.9	7.1	55.47
300	323.9	8	62.3
300	323.9	10	77.4
300	323.9	4	31.6
300	323.9	5	35.4
300	323.9	5.6	44
300	323.9	7.1	55.5
350	355.6	8	68.58
350	355.6	10	85.23
350	355.6	5.6	48.33
350	355.6	6.4	55.11
350	355.6	7.1	61.02
350	355.6	7.9	67.74
350	355.6	8.7	74.42
350	355.6	9.5	81.08

Dimension (mm × mm)	Thickness (mm)	Section Weight (kg/m)
40 × 20	2	1.758
40 × 20	2.5	2.159
40 × 20	3	2.543
40 × 20	4	3.266
50 × 25	2	2.229
50 × 25	2.5	2.747
50 × 25	3	3.25
50 × 25	4	4.208
65 × 35	2	3.014
65 × 35	2.5	3.729
65 × 35	3	4.427
65 × 35	4	5.778
80 × 40	2	3.642
80 × 40	2.5	4.514
80 × 40	3	5.369
80 × 40	4	7.002
100 × 50	2	4.425
100 × 50	2.5	5.48
100 × 50	3	6.512
100 × 50	4	8.748
100 × 75	2	5.882
100 × 75	2.5	7.28
100 × 75	3	8.656
100 × 75	4	11.618
125 × 50	2	5.472
125 × 50	2.5	6.836
125 × 50	3	7.96
125 × 50	4	10.488
150 × 75	2	6.939
150 × 75	2.5	8.635
150 × 75	3

Tubes/Pipes