GOST 8639 was published in 1982 instead of the document dated ´68 and applies to cold-formed and hot-formed, electric-welded cold-worked and electric-welded seamless steel pipes with square or rectangular sections. The paper presents an assortment of such products. Technical requirements for such pipes must fully comply with GOST 13663. The numerical values ​​of the standards from 1982 and 1968 have slight differences.

GOST 8639-82 steel square pipes

The assortment of steel pipes according to GOST 8639-82 includes products of both square and rectangular sections

The use of square products

The definition of the assortment of steel square pipes according to GOST 8639 (some changes were made in 92) allows us to classify products and simplify calculations of structural parameters when using them. The distribution of profile pipes is explained by a favorable combination of strength and lightness indicators.

Note! If there is a need, then it is permissible to produce products outside the range determined by GOST. In this case, the products must comply with the requirements of other regulatory documents.

They are used in the construction of enclosing structures, as supporting parts of external pipelines, metal roofs, in the manufacture of products such as frames, beams, stairs, floors. In addition, products with a square (in many cases with a rectangular) section are used in transport and in industry.

Electric-welded pipes are made from flat billets, seamless - from round.

GOST 8639-82 steel square pipes

Square steel pipes are the basis for a wide variety of elements and structures used in construction

Product range according to GOST 8639-82

The square steel pipe according to the normative document 8639 should have the sizes presented in the table.

Table 1

Pipe wall length, * 102 mm The cross-sectional area of ​​the pipe, * 10-1 cm2 Wall thickness
*10-1 mm		 Weight 1 meter, kg
0,1 3,43 10 0,269
0,15 5,43 10 0,426
7,71 15 0,605
0,2 7,43 10 0,583
10,71 15 0,841
13,7 20 1,075
0,25 9,43 10 0,740
13,7 15 1,07
17,7 20 1,39
21,4 25 1,68
24,8 30 1,95
0,30 21,7 20 1,70
26,4 25 2,07
30,8 30 2,42
35,0 35 2,75
38,8 40 3,04
0,35 25,7 20 2,02
31,4 25 2,46
36,8 30 2,89
42,0 35 3,30
46,8 40 3,67
55,7 50 4,37
0,40 29,7 20 2,33
36,4 25 2,85
42,8 30 3,36
49,0 35 3,85
54,8 40 4,30
65,7 50 5,16
75,4 60 5,92
0,42 45,2 30 3,55
51,8 35 4,07
58,0 40 4,56
69,7 50 5,47
80,2 60 6,30
0,45 48,8 30 3,83
56,0 35 4,40
62,8 40 4,93
75,7 50 5,94
87,4 60 6,86
98,0 70 7,69
107,4 80 8,43
0,50 54,8 30 4,31
63,0 35 4,94
70,8 40 5,56
85,7 50 6,73
99,4 60 7,80
112,0 70 8,79
123,4 80 9,69
0,60 77,0 35 6,04
86,8 40 6,82
105,7 50 8,30
123,4 60 9,69
140,0 70 11,00
155,4 80 12,20
0,70 102,8 40 8,07
125,7 50 9,87
147,4 60 11,57
168,0 70 13,19
187,4 80 14,71
0,80 118,8 40 9,33
145,7 50 11,44
171,4 60 13,46
196,0 70 15,38
219,4 80 17,22
0,90 165,7 50 13,00
195,4 60 15,34
224,0 70 17,58
251,4 80 19,73
1,00 219,4 60 17,22
252,0 70 19,78
283,4 80 22,25
313,7 90 24,62
1,10 243,4 60 19,11
280,0 70 21,98
315,4 80 24,76
349,7 90 27,45
1,20 267,4 60 20,99
308,0 70 24,18
347,4 80 27,27
385,7 90 30,28
1,40 315,4 60 24,76
364,0 70 28,57
411,4 80 32,29
457,7 90 35,93
1,50 392,0 70 30,77
443,4 80 34,81
493,7 90 38,75
542,8 100 42,61
1,80 539,4 80 42,34
601,7 90 47,23
662,8 100 52,03
781,7 120 61,36
895,9 140 70,33

 

The values ​​of the indicators in document 8639-82

Standard 8639 gives the values ​​of the moment of inertia and the moment of resistance for a square pipe. These values ​​are necessary for calculating the mechanical reliability of structures.

GOST 8639-82 steel square pipes

Each product from the assortment of square pipes must have the dimensions and weight specified in GOST

Numerical values ​​are given in the table.

table 2

Pipe wall length, * 102 mm Wall thickness
*10-1 mm		 The moment of resistance of the pipe, * 10 cm3 Moment of inertia,
* 10 cm4
0,1 10 0,00904 0,00452
0,15 10 0,0233 0,0176
15 0,0305 0,0229
0,2 10 0,0442 0,0442
15 0,0600 0,0600
20 0,0723 0,0723
0,25 10 0,0718 0,0897
15 0,0996 0,124
20 0,122 0,153
25 0,141 0,177
30 0,156 0,195
0,30 20 0,186 0,279
25 0,218 0,327
30 0,244 0,366
35 0,265 0,398
40 0,282 0,423
0,35 20 0,263 0,461
25 0,311 0,544
30 0,352 0,617
35 0,388 0,678
40 0,417 0,730
50 0,460 0,805
0,40 20 0,353 0,707
25 0,421 0,842
30 0,481 0,961
35 0,533 1,066
40 0,579 1,157
50 0,650 1,301
60 0,698 1,396
0,42 30 0,538 1,130
35 0,598 1,256
40 0,651 1,367
50 0,736 1,545
60 0,795 1,669
0,45 30 0,629 1,415
35 0,702 1,579
40 0,767 1,725
50 0,838 1,966
60 0,952 2,142
70 1,004 2,260
80 1,033 2,323
0,50 30 0,797 1,993
35 0,894 2,235
40 0,982 2,454
50 1,130 2,826
60 1,246 3,115
70 1,331 3,328
80 1,388 3,470
0,60 35 1,348 4,044
40 1,491 4,473
50 1,743 5,230
60 1,953 5,860
70 2,124 6,371
80 2,257 6,771
0,70 40 2,107 7,374
50 2,489 8,712
60 2,820 9,869
70 3,102 10,856
80 3,337 11,681
0,80 40 2,829 11,317
50 3,368 13,473
60 3,846 15,384
70 4,266 17,063
80 4,630 18,520
0,90 50 4,380 19,712
60 5,032 22,644
70 5,616 25,271
80 6,135 27,608
1,00 60 6,378 31,889
70 7,152 35,762
80 7,853 39,265
90 8,482 42,411
1,10 60 7,883 43,359
70 8,875 48,814
80 9,784 53,811
90 10,611 58,363
1,20 60 9,549 57,294
70 10,785 64,709
80 11,928 71,566
90 12,980 77,882
1,40 60 13,360 93,519
70 15,163 106,144
80 16,855 117,983
90 18,437 129,058
1,50 70 17,632 132,244
80 19,638 147,285
90 21,525 161,437
100 23,296 174,721
1,80 80 29,267 263,406
90 32,228 290,049
100 35,044 315,395
120 40,256 362,301
140 44,927 404,341

 

Other possible pipe sizes according to GOST

Regulatory document 8639-82 for square steel products identifies several special sizes for pipes. The characteristics of such products are given in the table.

Table 3

Pipe wall length
*102 mm		 Wall thickness
*10-1 mm		 The moment of resistance of the pipe, * 10 cm3 Moment of inertia,
* 10 cm4 		The cross-sectional area of ​​the pipe, * 10-1 cm2 Weight 1 meter, kg
0,32 40 0,333 0,533 42,0 3,30
0,36 40 0,447 0,805 48,4 3,80
0,40 20 0,354 0,707 29,7 2,33
0,65 60 2,366 7,691 135,4 10,63

 

If the steel pipe has side sizes from 0.01 to 0.12 meters and a wall thickness of 10-80 (* 10-1) mm, then it is made (according to GOST) cold-deformed.

GOST 8639-82 steel square pipes

Electric welded pipes differ in size from cold and hot deformed

If the dimensions of the product are from 0.06 to 0.18 meters, and the wall is 40-140 (* 10-1) mm - it is hot-deformed. Electric pipes according to 8639-82 are characterized by external dimensions of 0.01-0.1 m and a wall of 10-50 (* 10-1) mm.

Note! To calculate the mass in standard 8639 from ´82 and ´68 years, the density of steel was taken equal to 7850 kg / m3.

Also, steel square pipes (GOST 8639-82) determine the radius of curvature, which should be no more than twice the wall thickness.

Pipe lengths in the manufacture according to 8639-82

Regulatory document 8639-82 establishes the manufacture of products of non-dimensional, multiple measured and measured length.

Table 4

Steel pipe Length cm
measured unmeasured multiple measured
seamless hot deformed 400-1250 400-1250 400-1250 (with a cut allowance of 5 mm)
seamless cold formed 450-1100 150-900 150-1100 (with a allowance for a cut of 5 mm)
electric welded 500-900 150-900 any multiplicity that does not exceed the lower limit for measuring products

 

At the same time, GOST from ´82 and ´68 means that for multiple pipes their total length should not exceed the upper value for measured products. Maximum deviation of the total length up to + 1 cm. The documents under consideration have a similar assortment. Steel rectangular pipes (GOST 8639-68) are limited only by upper limit values ​​for the length.

Limit deviations for steel square pipes (GOST 8639-82)

The product range is wide enough and the document from ´82 and ´68 gives the values ​​of the maximum deviations of their parameters.

Note! In 8639-68 there is no division by accuracy; the standard considers the normal accuracy of manufacturing products.

GOST 8639-82 steel square pipes

According to GOST, pipes must be produced with a length restriction, which depends on the method of manufacturing the product

The data that relate to the external dimensions are shown in the table.

Table 5

Steel pipe The maximum deviation characteristic of precision manufacturing
High Normal
seamless hot deformed ±12,5* 10-1 % ±15*10-1 %
seamless cold formed and electrowelded up to 3 cm ±2,5*10-1 mm ± 0.3 mm
seamless cold formed and electrowelded up to 3-5 cm ±3*10-1mm ± 0.4 mm
seamless cold formed and electrowelded more than 5 cm ±8*10-1% ±0,8%

 

The maximum deviations regarding the wall thicknesses for products according to standard 8639-82 are given in the table.

Table 6

Steel pipe The maximum deviation characteristic of precision manufacturing
high normal
hot deformed from -15.0% to + 12.5% from -15.0% to + 12.5%
cold-deformed (seamless and electrowelded) up to and including 3.5 mm ±12,5% ±12,5%
cold-deformed (seamless and electrowelded) more than 3.5 mm ±10,0% ±12,5%
electric welded ±10,0% ±10,0%

 

The deviation from the right angle in the transverse section should not be more than 1.5º in one direction or another. The deviation in curvature may not exceed 2 mm per meter of length.

GOST 8639-82 steel square pipes

The deviations of the rectangularity of the pipes can be calculated by determining the difference between 90 degrees and the angle O1 indicated in the diagram

Limit deviations of concavity and convexity in accordance with GOST

The maximum deviations regarding the concavity or convexity of the parties, according to GOST, are given in the table.

Table 7

Steel pipe The maximum deviation characteristic of precision manufacturing
High
*10-1 mm		 Normal, * 10-1 mm
seamless hot deformed up to 5 cm 5 7,5
seamless hot-deformed 5-7 cm 8 10
seamless hot-deformed 7-10 cm 12 15
seamless hot formed over 10 cm 15 20
seamless cold formed and electrowelded up to 5 cm 5 5
seamless cold-deformed and electrowelded 5-7 cm 5 7,5
seamless cold formed and electrowelded more than 7 cm 8 10

 

Rectangular and square pipes have extreme twisting deviations for high precision products. For seamless hot-formed and electrowelded, this value is 2 degrees per 1 meter. For cold-deformed indicators are agreed with the consumer.

Some changes from ´87, ´89 and ´92 years

Regulatory documents are reviewed from time to time, adjusted and corrected.

Note! In September ´92, November ´89 and June ´87 (IMS 12 - 92, 2 - 90, 12 - 87) some changes were made to GOST 8639 that complement the assortment.

GOST 8639-82 steel square pipes

The strength, reliability and stability of the structure of them directly depend on compliance with standards during production and their compliance with finished products.

Development and implementation of norms, requirements and control of the necessary characteristics of the product ensures its high quality and safety of use.

Table 8

Pipe wall length
*102 mm		 The cross-sectional area of ​​the pipe, * 10-1 cm2
 Wall thickness * 10-1 mm Weight 1 meter, kg
0,1 2,83 8 0,222
3,14 9 0,246
3,98 12 0,312
4,48 14 0,352
0,15 4,43 8 0,348
4,94 9 0,388
6,38 12 0,501
7,28 14 0,571
0,20 6,03 8 0,474
6,74 9 0,529
8,78 12 0,689
10,1 14 0,791
0,25 7,63 8 0,599
8,54 9 0,670
11,2 12 0,878
12,9 14 1,01
0,30 9,23 8 0,725
10,3 9 0,811
11,4 10 0,897
13,6 12 1,07
14,6 13 1,15
15,7 14 1,23
16,7 15 1,31
0,35 10,83 8 0,850
12,1 9 0,953
18,5 14 1,45
19,7 15 1,55
0,4 21,3 14 1,67
22,7 15 1,78
0,45 33,7 20 2,65
0,50 37,7 20 2,96
46,4 25 3,64
78,4 45 6,16
0,60 45,7 20 3,59
56,4 25 4,43
66,9 35 5,25
0,70 78,8 30 6,19
91,0 35 7,14
80 90,9 30 7,13
105,0 35 8,24
241,7 90 18,97
262,8 100 20,63
282,8 110 22,20
0,90 102,8 30 8,07
134,8 40 10,59
1,00 114,8 30 9,02
150,8 40 11,84
185,7 50 14,58

 

GOST is supplemented by special pipe sizes of 0.55 cm with a wall thickness of 3 mm, a cross-sectional area of ​​6.09 cm2, and a weight of 1 meter 4.78 kg.

Moments of inertia and resistance by changes from ´87, ´89 and ´92

The values ​​of the moments of inertia and resistance according to GOST 8639 in accordance with the changes (IMS 12 - 92, 2 - 90, 12 - 87) are presented in the table.

Table 9

Pipe wall length, * 102  mm Wall thickness * 10-1 mm The moment of resistance of the pipe, * 10 cm3 Moment of inertia,
* 10 cm4
0,1 8 0,0079 0,0039
9 0,0085 0,0042
12 0,0100 0,0050
14 0,0107 0,0053
0,15 8 0,0196 0,0147
9 0,0215 0,0161
12 0,0265 0,0199
14 0,0293 0,0220
0,20 8 0,0368 0,0368
9 0,0406 0,0406
12 0,0510 0,0510
14 0,0572 0,0572
0,25 8 0,0592 0,0740
9 0,0656 0,0820
12 0,0835 0,104
14 0,0945 0,118
0,30 8 0,0870 0,130
9 0,0966 0,145
10 0,106 0,159
12 0,124 0,186
13 0,133 0,199
14 0,141 0,212
15 0,149 0,224
0,35 8 0,120 0,210
9 0,134 0,234
14 0,197 0,345
15 0,209 0,365
0,4 14 0,262 0,524
15 0,278 0,557
0,45 20 0,457 1,029
0,50 20 0,574 1,436
25 0,691 1,727
45 1,060 2,651
0,60 20 0,848 2,545
25 1,027 3,081
35 1,194 3,581
0,70 30 1,670 5,845
35 1,895 6,634
80 30 2,226 8,905
35 2,536 10,144
90 4,941 19,766
100 5,203 20,810
110 5,416 21,664
0,90 30 2,863 12,882
40 3,658 16,463
1,00 30 3,579 17,895
40 4,594 22,971
50 5,526 27,630

 

The special pipe size according to GOST 55 mm has an inertia moment of 27.10 cm4 and the moment of resistance of 9.85 cm³.

Determination of the assortment of steel rectangular pipes by GOST 8639-82 allows you to quickly select the necessary product designs, as well as establish and calculate their reliability parameters.