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GOST 23270-89

GOST 23270−89 (ISO 2938−74) Tubes-billets for mechanical treatment. Specifications

GOST 23270−89
(ISO 2938−74)

Group В62

INTERSTATE STANDARD

TUBES-BILLETS FOR MECHANICAL TREATMENT

Specifications

Tubes-billets for mechanical treatment.
Specifications

ISS 77.140.60
OKP 13 1900

Date of introduction 1991−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR

DEVELOPERS

E. A. Bliznyuki, PhD. tech. Sciences; V. P. Sokurenko, PhD. tech. Sciences (head of subject); V. N. Rivne, PhD. tech. Sciences; G. A. Gorovenko, PhD. tech. Sciences; A. A. Levitsky

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 28.06.89 N 2145

3. REPLACE GOST 23270−78

4. The standard corresponds to the international standard ISO 2938−74 in terms of the limit deviation for diameter and wall thickness, the curvature of the pipe, length of pipe, the technological parameters

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

   
The designation of the reference document referenced
Item number
GOST 8.051−81
4.11
GOST 427−75
4.10
GOST 1050−88
2.1
GOST 1778−70
2.2.13
GOST 4543−71
2.1
GOST 5639−82
2.2.4
GOST 7565−81
4.3
GOST 8026−92
4.10
GOST 8328−75
4.10
GOST 8732−78
1.6
GOST 8734−75
1.6
GOST 9012−59
4.6
GOST 10006−80
4.4, 4.5
GOST 10243−75
4.7
GOST 10692−80
2.3, 5.1
GOST 12344−2003
4.3
GOST 12345−2001
4.3
GOST 12346−78
4.3
GOST 12347−77
4.3
GOST 12348−78
4.3
GOST 12349−83
4.3
GOST 12350−78
4.3
GOST 12351−81* 4.3
______________
* Standards 12351−2003. — Note the CODE.
GOST 12352−81
4.3
GOST 12353−78
4.3
GOST 12354−81
4.3
GOST 12355−78
4.3
GOST 12356−81
4.3
GOST 12357−84
4.3
GOST 12358−2002
4.3
GOST 12359−99
4.3
GOST 12360−82
4.3
GOST 12361−2002
4.3
GOST 12362−79
4.3
GOST 12363−79
4.3
GOST 12364−84
4.3
GOST 12365−84
4.3
GOST 14959−79
2.1
GOST 17410−78
4.8
GOST 18360−93
4.11
GOST 18365−93
4.11
GOST 18895−97
4.3
GOST 19281−89
2.1
GOST 22536.0−87
4.3
GOST 22536.1−88
4.3
GOST 22536.2−87
4.3
GOST 22536.3−88
4.3
GOST 22536.4−88
4.3
GOST 22536.5−87
4.3
GOST 22536.6−88
4.3
GOST 22536.14−88
4.3
GOST 24853−81
4.11
THAT 2−034−225−87
4.10

6. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

7. REISSUE


This standard applies to steel seamless hot-deformed and cold-deformed pipe billet of carbon and alloy steels used for the manufacture of products by machining.

1. ASSORTMENT

1.1. Pipe is manufactured from the outside diameter, wall thickness and length.

1.2. Dimensions and weight of 1 m of pipes shall be as specified in table.1 for hot-deformed pipes in the table.2 — for cold pipes.

Table 1

                           
Outside — tion diameter, mm Weight of 1 m of hot-deformed tubes for the nominal sizes in the symmetric limit deviations, kg, at wall thickness, mm
  2,5 2,8 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8
42
- - 2,89 3,32 3,75 4,16 4,56 4,95 Of 5.33 - - - -
45
- - 3,11 3,58 Of 4.04 4,49 4,93 5,36 5,77 6,17 6,56 - -
50
- - 3,48 Of 4.01 4,54 5,05 5,55 Of 6.04 Of 6.51 Of 6.97 7,42 7,86 8,29
54
- - 3,77 4,36 4,93 5,49 Of 6.04 Of 6.58 7,10 Of 7.61 8,11 8,60 Of 9.08
57
- - Of 4.00 4.62 a Of 5.23 5,83 Of 6.41 6,99 7,55 8,10 8,63 9,16 Of 9.67
60
- - 4,22 4,88 5,52 6,16 Of 6.78 7,39 7,99 8,58 9,15 Of 9.71 Of 10.26
63,5
- - 4,48 5,18 5,87 6,55 7,21 7,87 8,51 9,14 9,75 10,36 10,95
68
- - - 5,57 6,31 Of 7.05 Of 7.77 8,48 9,17 9,86 Of 10.53 11,19 Of 11.84
70
- - - 5,74 Of 6.51 7,27 8,02 8,75 9,47 Of 10.18 Of 10.88 Of 11.56 12,23
73
- - - 6,00 Of 6.81 7,60 Of 8.39 9,16 9,91 10,66 11,39 12,12 Of 12.82
76
- - - 6,26 7,10 Of 7.94 8,76 9,56 10,36 11,14 11,91 12,67 13,42
83
- - - 6,86 7,79 Of 8.71 9,62 10,51 11,39 12,26 13,12 13,96 14,80
89
- - - Of 7.38 Of 8.39 Of 9.38 10,36 Of 11.33 12,28 Of 13.23 14,16 Of 15.07 15,98
95
- - - 7,90 Of 8.98 Of 10.04 11,10 12,14 13,17 14,19 15,19 16,18 17,16
102
- - - 8,50 Of 9.67 10,82 11,96 Of 13.09 Of 14.21 15,31 16,40 Of 17.48 18,55
108
- - - - Of 10.26 11,49 12,70 13,90 Of 15.09 16,27 17,44 To 18.59 19 and 73
114
- - - - 10,85 12,15 Of 13.44 14,72 15,98 17,23 18,47 19,70 20 and 91
121
- - - - 11,54 12,93 14,30 Of 15.67 Of 17.02 18,35 19,68 20,99 22,29
127
- - - - 12,13 13,60 15,04 16,48 17,90 For 19.32 Of 20.72 22,10 23,48
133
- - - - The 12.73 14,26 15,78 Of 17.29 To 18.79 20,28 21,75 Of 23.21 Of 24.66
140
- - - - - 15,04 16,65 18,24 Of 19.83 21,40 22,96 24,51 26,04
146
- - - - - 15,70 17,39 19,06 Of 20.72 22 and 36 24,00 Of 25.62 27,23
152
- - - - - Of 16.37 Of 18.13 19,87 21,60 Of 23.32 25,03 26,73 28,41
159
- - - - - 17,15 Of 18.99 20,82 22,64 24,45 26,24 To 28.02 Of 29.79
168
- - - - - - - 22,04 Of 23.97 25,89 27,79 29,69 31,57
180
- - - - - - - 23,67 25,75 Of 27.81 29,87 Of 31.91 From 33.93
194
- - - - - - - - 27,82 30,06 Of 32.28 34,50 Of 36.70
203
- - - - - - - - 29,15 31,50 33,84 Of 36.16 38,47
219
- - - - - - - - 31,52 34,06 36,60 Of 39.12 41,63
245
- - - - - - - - - - Of 41.09 43,93 46,76
273
- - - - - - - - - - - - 52,28
299
- - - - - - - - - - - - 57,41
325
- - - - - - - - - - - - Of 62.54



Extension table 1

                         
External diameter, mm Weight of 1 m of hot-deformed tubes for the nominal sizes in the symmetric limit deviations, kg, at wall thickness, mm
  8,5
9 9,5 10 11 12 13 14 15 16 17 18
42
- - - - - - - - - - - -
45
- - - - - - - - - - - -
50
- - - - - - - - - - - -
54
- - - - - - - - - - - -
57
10,17 10,65 11,13 At 11.59 12,48 Of 13.32 Of 14.11 - - - - -
60
10,80 To 11.32 11,83 Of 12.33 Of 13.29 Of 14.21 Of 15.07 15,88 - - - -
63,5
11,53 12,10 12,65 13,19 14,24 15,24 16,19 17,09 - - - -
68
12,47 13,10 13,71 14,30 And 15.46 Accounting period 16.57 17,63 Of 18.64 19,61 Of 20.52 - -
70
12,89 13,54 14,17 14,80 16,01 17,16 18,27 By 19,33 20,35 21,31 - -
73
13,52 Of 14.21 14,88 15,54 16,82 Of 18.05 Of 19.24 20,37 Of 21.46 22,49 23,48 24,42
76
14,15 14,87 15,58 16,28 17,63 Of 18.94 20,20 21,41 22,57 23,68 Of 24.74 25,75
83
15.62 min 16,43 17,22 18,00 19,53 21,01 Of 22.44 23,82 25,16 Of 26.44 Of 27.67 The 28.85
89
Of 16.88 17,76 18,63 19,48 Loss of 21.16 22,70 24,37 25,90 27,37 28,81 30.19 mm 31,52
95
Of 18.13 Of 19.09 20,03 20, and 96 Of 22.79 Of 24.56 26,29 27,97 29,59 31,17 32,70 34,18
102
19,60 20,64 Of 21.67 22,69 24,69 26,63 28,53 30,38 32,18 From 33.93 Of 35.64 37,29
108
20,86 Of 21.97 At 23.08 24,17 26,31 28,41 Of 30.46 Of 32.46 34,40 36,30 38,15 39,95
114
Of 22.12 From 23.31 24,48 25,65 27,94 30.19 mm Of 32.38 34 to 53 36,62 Of 38.67 40,67 42,62
121
23,58 24,86 26,12 27,37 Of 29.84 32,26 To 34.62 36,84 39,21 41,43 43,60 And 45.72
127
24,84 26,19 27,53 The 28.85 31,47 34,03 36,55 39,01 41,43 43,80 46,12 48,39
133
26,10 27,52 28,93 30,33 33,10 35,81 38,47 Of 41.09 43,65 46,17 From 48.63 51,05
140
27,57 A 29.08 30,57 Of 32.06 35,00 37,88 40,72 Of 43.50 Of 46.24 48,93 51,57 54,16
146
28,82 30,41 31,98 As 33.54 36,62 39,66 42,64 Of 45.57 48,46 From 51.30 54,08 56,82
152
30,08 31,74 33,39 35,02 38,25 41,43 44,56 47,65 50,68 53,66 56,60 59,48
159
31 to 55 33,29 35,03 Of 36.75 40,15 Of 43.50 46,81 50,06 53,27 56,43 59,53 62,59
168
Of 33.44 35,29 37,13 38,97 42,59 46,17 49,69 53,17 56,60 59,98 63,31 66,59
180
35,95 37,95 39,95 41,93 Of 45.85 49,72 53,54 57,31 61,04 Of 64.71 68,34 71,91
194
Of 38.89 From 41.06 43,23 45,38 49,64 Of 53.86 58,03 62,15 66,22 70,24 74,21 78,13
203
From 40.77 43,06 43,33 47,60 52,09 56,52 60,91 Of 65.25 69,55 73,79 77,98 82,12
219
44,13 Of 46.61 Of 49.08 51,54 56,43 61,26 66,04 70,78 75,46 80,10 84,69 89,23
245
49,58 52,38 55,17 57,95 63,48 68,95 74,38 79,76 85,08 90,36 95,59 100,77
273
55,45 58,60 61,73 64,86 71,07 77,24 83,36 89,42 95,44 101,41 107,33 113,20
299
60,90 64,37 67,83 71,27 78,13 84,93 91,69 98,40 Of 105.06 111,67 118,23 124,74
325
66,35 70,14 Of 73.92 77,68 To RUB 85.18 92,63 100,03 107,38 114,68 121,93 129,13 136,28



Extension table 1

                         
Outside — tion diameter, mm Weight of 1 m of hot-deformed tubes for the nominal sizes in the symmetric limit deviations, kg, at wall thickness, mm
  19
20
22 24 25 26 28 30 32 34 35 36
42
- - - - - - - - - - - -
45
- - - - - - - - - - - -
50
- - - - - - - - - - - -
54
- - - - - - - - - - - -
57
- - - - - _ - - - - - -
60
- - - - - - - - - - - -
63,5
- - - - - - - - - - - -
68
- - - - - - - - - - - -
70
- - - - - - - - - - - -
73
25,30 - - - - - - - - - - -
76
26,71 - - - - - - - - - - -
83
Of € 29.99 - - - - - - - - - - -
89
32,80 34,03 36,35 38,47 - - - - - - - -
95
35,61 36,99 39,61 42,02 - - - - - - - -
102
Of 38.89 Of 40.45 43,40 46,17 - - - - - - - -
108
Of 41.70 43,40 Of 46.66 49,72 Of 51.17 52,58 55,24 - - - - -
114
44,51 46,36 49,92 53,27 54,87 56,43 59,39 - - - - -
121
47,79 49,82 53,71 57,41 59,19 60,91 64,22 - - - - -
127
50,61 52,78 56,97 60,96 Of 62.89 64,76 68,36 71,77 - - - -
133
53,42 55,74 60,22 64,51 66,58 68,61 72,51 76,20 79,71 - - -
140
56,70 59,19 64,02 68,66 70,90 73,10 77,34 Of 81.38 85,23 Of 88.88 90,63 Of 92.33
146
Of 59.51 62,15 67,28 72,21 74,60 76,94 81,48 85,82 89,97 93,91 95,81 97,66
152
62,32 65,11 71,53 75,76 78,30 80,79 85,63 90,26 94,70 Of 98.94 100,99 102,99
159
65,60 68,56 74.33 USD 79,90 82,62 85,28 90,46 95,44 100,22 104,81 107,03 109,20
168
69,82 Of 73.00 79,21 85,23 88,16 91,05 96,67 Of 102.10 107,33 112,36 114,80 Of 117.19
180
75,44 78,92 85,72 Of 92.33 95,56 98,75 Of 104.96 110,98 116,80 122,42 125,16 127,85
194
Of 82.00 85,82 93,32 100,62 104,20 107,72 114,63 121,34 127,85 134,16 137,24 140,28
Two hundred three
86,22 90,26 98,20 105,95 109,74 113,49 120,84 127,99 134,95 141,71 145,01 148,27
219
93,71 98,15 106,88 115,42 119,61 123,75 131,89 139,83 147,57 155,12 158,82 162,47
245
105,90 110,98 120,99 130,80 135,64 140,42 149,84 159,07 168,09 176,92 181,26 185,55
273
119,02 124,79 136,18 147,38 152,90 Of 158, 38 169,18 179,78 190,19 200,40 205,43 210,41
299
131,20 137,61 150,29 162,77 168,93 175,05 187,13 199,02 210,71 222,20 227,87 233,50
325
143,38 150,44 164,39 178,16 184,96 191,72 205,09 218,25 231,23 Of 244.00 250,31 256,58



Extension table 1

         
External diameter, mm Weight of 1 m of hot-deformed tubes for the nominal sizes in the symmetric limit deviations, kg, at wall thickness, mm
  38 40 42 45
42
- - - -
45
- - - -
50
- - - -
54
- - - -
57
- - - -
60
- - - -
63,5
- - - -
68
- - - -
70
- - - -
73
- - - -
76
- - - -
83
- - - -
89
- - - -
95
- - - -
102
- - - -
108
- - - -
114
- - - -
121
- - - -
127
- - - -
133
- - - -
140
- - - -
146
- - - -
152
- - - -
159
- - - -
168
121,83 126,27 130,51 136,50
180
133,07 138,10 142,94 149,82
194
146,19 151,92 157,44 165,36
203
154,63 160,79 166,76 175,34
219
169,62 176,58 183,33 193,10
245
193,99 202,22 210,26 221,95
273
220,23 229,85 239,27 253,03
299
244,59 255,49 266,20 281,88
325
268,96 281,14 293,13 310,74

1.3. The size of the tubes-workpieces for subsequent machining should be selected based on the size of the finished product, in accordance with the application. The estimated size is rounded up to the nearest standard according to the table.1 and 2.


Table 2

                                     
Outside — tion diameter, mm Weight of 1 m cold-deformed tubes for the nominal sizes in the symmetric limit deviations
kg, at wall thickness, mm
  5,0
5,5 6,0 6,5 7,0 7,5 8,0 8,5 9,0 9,5 10 11 12 14 16 18 20 22
30
3,083 3,323 3,551 3,767 3,971 4,162 4,340 - - - - - - - - - - -
32
3,329 3,594 3,847 4,087 4,316 4,531 4,735 - - - - - - - - - - -
34
3,576 3,866 4,143 4,408 4,661 4,901 5,129 - - - - - - - - - - -
35
3,699 4,001 4,291 4,568 4,834 5,086 5,327 - - - - - - - - - - -
36
3,822 4,137 4,439 4,728 5,006 5,271 5,524 - - - - - - - - - - -
38
4,069 4,408 4,735 5,049 5,352 5,641 5,919 6,184 6,437 - - - - - - - - -
40
4,316 4,680 5,081 5,369 5,697 6,011 6,313 6,603 6,881 - - - - - - - - -
42
4,562 4,951 5,327 5,690 6,042 6,381 6,700 7,023 7,324 - - - - - - - - -
45
4,932 5,358 5,771 6,171 Susan: 6.560 6,936 7,300 7,651 7,990 8,317 8,632 - - - - - - -
48
5,302 5,765 6,215 6,652 7,078 7,491 7,892 8,280 8,656 9,020 9,371 - - - - - - -
50
5,549 6,036 6,511 6,972 7,423 7,861 8,286 8,699 9,110 9,489 9,865 10,580 11,246 - - - - -
51
5,672 6,172 6,659 7,132 7,596 8,046 8,484 8,909 9,322 9,723 10,111 10,851 11,542 - - - - -
53
5,919 Of 6, 443 6,955 7,453 7,941 8,416 8,878 9,328 9,766 10,191 10,604 11,394 12,133 - - - - -
54
6,042 6,578 7,108 7,613 8,114 8,601 9,075 9,538 9,988 10,426 10,851 11,655 12,429 - - - - -
56
6,289 6,850 7,398 7,934 8,459 8,971 9,470 9,957 10,432 10,894 11,345 12,207 13,021 - - - - -
57
6,412 6,985 7,546 8,095 8,632 9,156 9,667 10,167 10,654 11,128 11,591 12,479 13,317 - - - - -
60
6,782 7,392 7,990 8,575 9,149 9,710 10,259 10,796 11,320 11,831 Twelve thousand three hundred thirty one 13,293 14,205 - - - - -
63
- 7,799 8,434 9,056 9,667 10,265 10,851 11,424 11,985 12,534 13,070 14,106 15,093 - - - - -
65
- 8,070 8,730 9,377 10,013 10,635 11,246 11,844 12,429 13,003 13,564 14,649 15,685 - - - - -
68
- 8,477 9,174 9,857 10,530 11,190 11,838 12,473 13,095 13,706 14,304 15,463 16,573 - - - - -
70
- - 9,470 10,178 10,876 11,560 12,232 12,892 13,539 14,174 14,797 16,005 17,164 - - - - -
73
- - 9,914 10,659 11,394 12,115 12,824 13,521 14,205 14,877 15,537 16,819 18,052 - - - - -
75
- - - 10,980 11,739 Make 12 485 13,219 13,940 14,649 15,345 16,030 17,362 18,644 - - - - -
76
- - - 11,140 11,911 12,670 13,416 14,150 14,871 15,580 16,276 17,633 18,940 - - - - -
80
- - - - 12,602 13,410 14,205 14,988 15,759 16,517 17,263 18,718 20,124 - - - - -
83
- - - - 13,120 13,965 14,797 15,617 16,425 17,220 18,003 19,532 21,012 - - - - -
85
- - - - 13,465 14,334 15,191 16,036 16,868 17,688 18,496 20,074 21,603 - - - - -
89
- - - - - 15,074 15,981 16,875 17,756 18,626 19,486 21,160 22,787 - - - - -
90
- - - - - 15,259 16,178 17,084 17,978 18,860 19,729 21,431 23,083 - - - - -
95
- - - - - - 17,164 18,132 19,088 20,031 20,962 22,787 24,563 - - - - -
100
- - - - - - - 19,180 20,198 21,203 22,192 24,144 26,043 29,692 33,145 36,400 - -
102
- - - - - - - 19,600 20,642 21,671 22,689 24,686 26,634 30,383 33,934 37,288 - -
108
- - - - - - - - 21,973 23,077 24,168 26,314 28,410 32,455 36,302 39,952 - -
110
- - - - - - - - 22,417 23,546 24,662 Twenty six thousand eight hundred fifty six 29,002 33,145 37,091 40,839 44,391 47,745
120
- - - - - - - - - - 27,128 29,569 31,961 36,598 41,037 45,278 49,323 53,170



Notes to the table.1, 2:

1. Weight of 1 m pipe is determined by the formula

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия,


where ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияis the outer diameter expressed in mm;

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия — wall thickness, mm.

The density of steel is taken equal to 7,850 (g/cmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия).

2. In the manufacture of pipes with asymmetric extreme deviation nominal pipe sizes are based on half of the algebraic sum of plus and minus deviations.

1.4. Pipe manufacture:

random lengths from 1.5 to 11.5 m;

lengths from 1.5 to 9 m, with extreme deviations in length +10 mm;

multiple of gauging length within off-gage with an allowance for each cut is 5 mm and the limit deviation for the total length does not exceed specified pipe lengths.

1.5. Length of the measuring pipe with wall thickness more than 16 mm shall be by agreement between manufacturer and consumer.

1.6. Tolerances for outside diameter, wall thickness and deviation along the length of the pipes according to GOST 8732 for hot-deformed pipes GOST 8734 and for cold pipes.

1.7. The curvature of any section of the tube per 1 m of length should not exceed, mm:

1.5 — for pipes with wall thickness up to 20 mm incl.;

2,0 — for pipes with wall thickness over 20 mm to 30 mm incl.;

The 4.0 — for pipes with wall thickness over 30 mm.

In coordination with the consumer the total curvature of tubes shall not exceed 0,0015ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, where ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияis the length of the pipe, but not more than:

12 mm — for pipes with wall thickness up to 20 mm incl.;

15 mm — for pipes with wall thickness over 20 mm.

1.8. At the request of the consumer pipe is manufactured with an offset field of the limit deviations on size. The value of the offset field of the limit deviations shall not exceed the amount of bilateral deviations. Allowed to produce pipes of other sizes.

Examples of symbols:


Pipe with an outer diameter of 89 mm with a wall thickness of 10 mm, of steel grade 10, random length:

Pipe 89х10 — 10 GOST 23270−89


Same length, a multiple of 350 mm:

Pipe 89х10х350 cu. — 10 GOST 23270−89


The same dimensional length equal to 4000 mm:

Pipe 89x10x4000 — 10 GOST 23270−89


Pipe with an outer diameter of 168 mm and a wall thickness of 13 mm, of steel 38H2MYUA in the heat treated condition of random length:

Pipe 168х13 — 38H2MYUA (T) GOST 23270−89

2. TECHNICAL REQUIREMENTS

2.1. Pipe manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

Pipes made from steel grades 10, 20, 35, 45, 30HGSA, 30KHMA, 12KHN2, 38H2MYUA, 10G2, 15X, 20X, 40X, 15KHM with the chemical composition according to GOST 1050, GOST 4543, GOST 14959, GOST 19281.

By agreement with the consumer allowed to manufacture pipes from other steel grades, provided the listed standards.

2.2. Features

2.2.1. Mechanical properties of hot-deformed metal pipe shall be as specified in table.3 and cold-deformed tubes — in table.4.

Table 3

           
Steel grade

Temporary tear resistance ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, N/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия(kgf/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия)

Yield strengthГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, N/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия(kgf/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия)

Take
tional elongationГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, %

Brinell hardness number (wall thickness more than 10 mm)
  not less than Indentation diameter, mm, not less
The number of hardness HB, no more
10
353 (36) 216 (22) 24 5,1 137
20
412 (42) 245 (25) 21 4,8 156
35
510 (52) 294 (30) 17 4,4 187
45
588 (60) 323 (33) 14 4,2 207
30KHGSA
686 (70) - 11 - -
30KHMA
588 (60) 392 (40) 13 - -
12KHN2
539 (55) 392 (40) 14 - -



Table 4

           
Steel grade

Temporary tear resistance ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, N/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия(kgf/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия)

Yield strengthГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, N/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия(kgf/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия)

Take
tional elongationГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, %

Brinell hardness number (wall thickness more than 10 mm)
  not less than Indentation diameter, mm, not less
The number of hardness HB, no more
10
345 (35) 206 (21) 24 5,1 137
20
412 (42) 245 (25) 21 4,8 156
35
510 (52) 294 (30) 17 4,4 187
45
589 (60) 323 (33) 14 4,2 207
10G2
422 (43) 245 (25) 22 4,3 197
15X
412 (42) - 19 4,5 179
20X
431 (44) - 17 4,5 179
40X
618 (63) - 14 4,1 217
30KHGSA
491 (50) - 18 4,0 220
15KHM
431 (44) 226 (23) 21 - -


Note. The yield stress for pipe, steel, 15X, 20X, 40X and 30KHGSA to 01.01.93 not normalized. The definition of the required data set.

2.2.2. Mechanical properties of pipe metal of steel 38H2MYUA, determined on heat-treated samples must meet the requirements specified in table.5.

Table 5

             
Heat treatment of the sample

Temporary tear resistance ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, N/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия(kgf/mmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия)


Take
tional elongationГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия,%

The relative narrowing of the wall thickness is more than 5 mm ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, %

Toughness with a wall thickness of over 12 mm KCU, j/cmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия(kgf/cmГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия)

Brinell hardness number (wall thickness more than 10 mm)
  not less than Indentation diameter, mm, not less
The number of hardness HB, no more
Annealing (940±15) °C water or oil, tempering (640±40) °C water or oil
980 (100) 14 50 88,2 (9) 3,4−3,7 321−269

2.2.3. For steel 38H2MYUA production methods stipulated in the order. The metal melted by electroslag remelting, the mass fraction of sulfur should not exceed 0,015%, and the deviation of the mass fraction of silicon allowed is 0.1%.

2.2.4. Grain size of metal pipe steel 38H2MYUA should be no larger than 5 points according to GOST 5639.

2.2.5. On the surface of the pipes is not allowed defects, bringing the wall thickness beyond the minimum limit deviations.

2.2.6. The pipe ends should be trimmed and cleaned of burrs; allowed the formation of a chamfer at their removal. Method of trimming is not regulated.

2.2.7. When cutting pipes with a torch or plasma cutting the stock to length of the pipes should be at least 20 mm for each cut.

2.2.8. In coordination with the consumer pipes are made without trimming the ends. While not cut part of the pipe marked with paint and the weight of the batch is not included.

2.2.9. At the request of the consumer hot-deformed pipes with wall thickness more than 12 mm check on the macrostructure. It should not be traces podnasadochnogo looseness, delamination, cracks, voids, bubbles, bloat, crust, flocs, contaminants and other defects visible without using the magnifying devices.

2.2.10. At the request of the consumer hot tubes of alloyed steel should termoobrabotannyj. Heat treatment regime and norms of mechanical properties determined by agreement between manufacturer and consumer.

2.2.11. At the request of the consumer pipe from steel 38H2MYUA must be heat treated with a hardness of no more than 229 HB (indentation diameter not less than 4 mm).

Allowed production of tubes rolling after heating the hardness is not more than 285 HB (indentation diameter not less than 3.6 mm).

2.2.12. The yield strength and Brinell hardness number of steel pipes, the manufacturer determines at the request of the consumer.

2.2.13. The impurity of metal hot-deformed tubes made from rolled billets, non-metallic inclusions by the maximum score should not exceed the limits specified in table.6.

Table 6

     
Steel grade Contamination of the metal pipes according to the points
(GOST 1778), not more
  conventional smelting electroslag remelting
38H2MYUA
   
the oxides or silicates
4,0 3,0
sulphides
3,5 2,0
30KHGSA, 30KHMA, 12KHN2
   
for oxides and silicates
4,5 -
sulphides
4,5 -

2.2.14. At the request of the consumer pipe is subjected to flaw detection.

2.3. Labeling and packaging — according to GOST 10692 with the additional indication of grain size and contamination of the metal pipes, non-metallic inclusions.

3. ACCEPTANCE RULES

3.1. The pipe presented to the receiving parties. The party should consist of pipes of the same size, one steel, one kind of heat treatment (in the manufacture of pipes in thermally treated condition) and, at the request of the consumer, one melting and accompanied by a document about quality that contains:

trademark or the name and trademark of manufacturer;

the lot number or melt;

the chemical composition of the metal pipes (on customer requirement);

the symbol of the pipes;

the total length of pipes and number of pipes in pieces;

the weight of the batch;

the results of the tests;

the value of the yield strength for steel grades 15X, 20X, 40 and 30KHGSA;

stamp of technical control Department.

3.2. The number of tubes in the party should be.:

400 — for pipes with a diameter less than 76 mm;

200 for pipes of other diameters.

3.3. Checking the external and internal surfaces and sizes, as well as flaw detection (if the requirements of paragraph 2.2.14) is subjected to each pipe of the party.

3.4. The chemical composition of the steel take on the document about the quality of the manufacturer of the workpiece.

3.5. For testing of tubes in tension and to control the microstructure of the party selected by the two tubes for each test.

If the party five or more pipes, select a pipe.

To control the hardness of selected 2% of tubes (but at least two of the party).

3.6. If unsatisfactory test results of at least one indicator thereon, a second test of the doubled sample from the same batch. The results of repeated tests spread to the entire party.

Allowed the manufacturer to conduct routine inspection of the tubes.

4. TEST METHODS

4.1. For each test, except test macrostructure and hardness, from each selected pipe cut out one sample. To control the macrostructure of the samples taken from both ends of the pipe, and for pipe diameters greater than 299 mm with a wall thickness of 30 mm and more — from one end of the pipe. To determine the number of samples allowed to apply statistical methods of control.

4.2. Inspection of pipes is carried out visually. The depth of the defects check adproval or otherwise. Allowed to control the geometric dimensions and surface quality of the pipes with special devices.

4.3. Chemical analysis of steel pipe is carried out according to GOST 22536.0 to GOST 22536.1−22536.6 GOST, GOST 12344−12365 GOST, GOST 22536.14, GOST 18895.

To determine the chemical composition of the steel samples are taken according to GOST 7565.

Allowed to apply other methods of analysis, ensuring accuracy in accordance with specified standards. The differences in the evaluation of product quality the chemical composition analysis is carried out according to specified standards.

4.4. The tensile test is carried out according to GOST 10006 on the longitudinal proportionate short sample. Test speed up to yield strength should be not more than 10 mm/min, yield point is not more than 40 mm/min.

4.5. Allowed to control the mechanical properties of pipes non-destructive methods. The differences in the assessment of the quality tests carried out according to GOST 10006.

4.6. The hardness test is carried out according to GOST 9012 on both ends of the pipe.

Allowed to determine the hardness of the specimens intended for the tensile test and the macrostructure.

Allowed to control hardness non-destructive methods. In the event of dispute, the test performed according to GOST 9012.

4.7. Macrostructure of the metal pipes checked for ProTrainer cross ring sample in accordance with GOST 10243.

4.8. Pipe shall be subjected to flaw detection by nondestructive methods according to normative-technical documentation.

When using the ultrasonic pulse echo method of flaw detection inspection of the tubes is carried out according to GOST 17410.

The control metal on volosovichi for steel 38H2MYUA carried out according to normative-technical documentation.

4.9. Control the length of the pipes lengths and dimensional performed by means of measurement, measurement error not exceeding ±2 mm for pipes up to 6 m, not more than ±3 mm for pipes longer than 6 m and not more than ±10 mm for pipes of random length.

4.10. Control the curvature of the pipes is carried out with a straight edge according to GOST 8026 or GOST 8328и probe on the other 2−034−225.

At the request of the consumer, they control the total curvature of the pipe. The scope and frequency of monitoring are established by the manufacturer. Control the total curvature of the pipe is carried out using taut strings and the measuring ruler according to GOST 427.

4.11. Control of the outer diameter and wall thickness of pipes is carried out by measuring the error of measurement which shall meet the requirements of GOST 8.051.

Allowed to control the outer diameter of the caliber-brackets with the Executive dimensions according to GOST 18360, 18365 GOST, GOST 24853.

5. TRANSPORTATION AND STORAGE

5.1. Transportation and storage — by GOST 10692.

APPLICATION (recommended). SELECTION OF RATIONAL SIZES OF TUBES-WORKPIECES FOR FABRICATION OF CYLINDRICAL PRODUCTS BY MACHINING

APP
Recommended

1. The choice of pipe sizes-blanks is determined by the method of processing by centering the pipe on the outer or inner diameters.

2. For centering the pipe with the outside diameter dimensions — outer diameterГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand wall thickness ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияassociated with the size of the pipe outer diameter ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand wall thickness ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand their tolerances ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияthe following dependencies:

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия

3. For centering hot tubes at the inner diameter measuring the inner diameter ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand wall thickness ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияassociated with the size of the pipe internal diameter ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand wall thickness ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand their tolerances ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияand the following dependencies:

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия

________________
* Formulas correspond to the original. — Note the CODE.

Designations:

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия — nominal external diameters and wall thickness of pipe, mm;

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия — pipe length, m;

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия, ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия — the negative and positive tolerances on outside diameter and wall thickness of pipe in fractions of a unit;

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условия — the coefficient that is selected as the table, depending on the specified reliability, expressed as a decimal;

ГОСТ 23270-89 (ИСО 2938-74) Трубы-заготовки для механической обработки. Технические условияthe curve of the pipe of 1 m length according to GOST, mm.