Wholesale Square Electrically Welded Pipes in USA and Europe

Square Tubes GOST 8639-82. Square Steel Tubes

Side size, mm	Limit deviations	Wall thickness, mm and limit deviations
		1	1.5	2	2.5	3	3.5	4	5	6	7	8	9	10
		Electrically welded pipes: ± 10 %; Seamless cold-deformed and electrically welded pipes: ± 12.5 %
		Weight of one meter, kg
10	± 0.3 mm	0.269
15		0.426	0.605
20		0.583	0.841	1.075
25		0.74	1.07	1.39	1.68	1.95
30				1.7	2.07	2.42	2.75	3.04
35	± 0.4 mm			2.02	2.46	2.69	3.3	3.67	4.37
40				2.38	2.85	3.36	3.85	4.3	5.16	5.92
42						3.55	4.07	4.56	5.47	6.3
45						3.83	4.4	4.93	5.94	6.86	7.69	8.43
50						4.31	4.94	5.56	6.73	7.8	8.79	9.69
60	± 0.8 %						6.04	6.82	8.3	9.69	11	12.2
70								8.07	9.87	11.57	13.19	14.71
80								9.33	11.44	13.46	15.38	17.22
90									13	15.34	17.58	19.73
100										17.22	19.78	22.25	24.62
110										19.11	21.98	24.76	27.45
120										20.99	24.18	27.27	30.28
140										24.76	28.57	32.29	35.93
150											30.77	34.81	38.75	42.61

The pipes are manufactured electrically welded. The pipes are manufactured seamless. The pipes are manufactured electrically welded and seamless.

Seamless cold-deformed pipes are manufactured of steel grades 10, 20, 35, 45 and of steel grade 09Г2C by agreement.
Electrically welded pipes are manufactured of steel grades 08ю, 08пс, 08кп, 10, 10пс, 20, 10кп, 15, 15кп, 15пс, 15сп, Ст2кп, Ст3сп, Ст3пс, Ст3кп.
The technical requirements are as per GOST 113663/86.
The length of electrically welded pipes with the preservation coat is up to 7.5 m.
Seamless cold-deformed steel pipes are manufactured heat treated with the electrically welded pipes being manufactured without heat treatment.
The pipes being more than 80 x 80 mm in size with the wall thickness more than 4 mm are delivered without straightening and end cropping.

Steel bent closed welded square section GOST 30245-03 as per GOST 27772-88, grade C255.

Steel welded square section as per GOST 30245

The weight of 1 meter is calculated by nominal sizes, the density of steel is taken to be equal to 7.85 g/cm².

Note: steel bent closed welded square sections are manufactured with the specified length, multiple specified length of 6000 to 12 000 mm, and random length.

Steel closed welded square sections are manufactured of steels grade Ст3пс/сп as per GOST 380−05, steel grade 20 as per GOST 1050−88, and steel grade 09Г2С as per GOST 19281−89.

Outer size A x B, mm	Limit deviations of outer sizes	Wall thickness, mm
		3	4	5	5.5	6	7	8	9	10	12	12.5	14	16
		Theoretical weight of section running meter, kg
100 х 100	± 1 %	9.0	11.7	14.4	15.7	17	19.1	21.4	23.5	25.6
120 х 120	± 0.8 %	10.8	14.2	17.5	19.2	20.7	23.5	26.4	29.2	31.8
140 х 140	± 0.8 %	12.7	16.8	20.7	22.6	24.5	27.9	31.4	34.8	38.1	43.4	44.8
150 х 150	± 0.8 %		18.0	22.3	24.3	26.4	30.1	33.9	37.7	41.3	47.1	48.7
160 х 160	± 0.8 %		19.3	23.8	26.1	28.3	32.3	36.5	40.5	44.4	50.9	52.6
180 х 180	± 0.8 %		21.8	27	29.5	32.1	36.7	41.5	46.1	50.7	58.5	60.5
200 х 200	± 0.8 %			30.1	33	35.8	41.1	46.5	51.8	57	66	68.3
250 х 250	± 0.8 %					45.2	52.1	59.1	65.9	72.7	84.8	88	97.1	108.9
300 x 300	± 0.8 %					54.7	63.1	71.6	80.1	88.4	103.7	107.6	119.1	134.1

Steel square and rectangular sections are primarily used for structural elements in the construction of industrial and commercial buildings (production buildings, exhibition halls, warehouses, athletic facilities, shopping and entertainment malls) as well as the machine building.