GOST 8734-78 steel 20 carbon seamless steel tube
OD: 10mm-610mm
W. T.: 1.65-60mm
Standard: GOST 8734-78,GOST8731,GOST 8732,GOST 8733-74,GOST 550-75,et
Material: 10#,20#,Q195,Q235,Q345,Gr.A,Gr.B etc.
Dimensions of pipes and tolerances according to GOST 8732-78.
Technical requirements according to GOST 8731-74.
Length from 4 up to 11.7 m depending on diameter and wall thickness.
Groups of metrics of quality:
BВ - with rate setting of chemical composition for killed steel (grades according to GOST 1050-88, GOST 4543-71, GOST 19281-89);
V - with rate setting of mechanical properties and chemical composition;
G - with rate setting of chemical composition and control of mechanical properties for heat-treated samples. Mechanical properties are according to steel standards.
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Deminsion
|
|
OD, mm
|
WT, mm
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OD, mm
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WT, mm
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OD, mm
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WT, mm
|
|
32 - 33,7
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2,8 - 4,0
|
89 - 95
|
3,5 - 24
|
146
|
5 - 38
|
|
38 - 42,4
|
3 - 4,5
|
102 - 108
|
4 - 28
|
152
|
5 - 40
|
|
45 - 54
|
3,5 - 6,0
|
114
|
4,5 - 28
|
159
|
5 - 42
|
|
57 - 68
|
3,5 - 14
|
121
|
5 - 30
|
168 - 194
|
6 - 45
|
|
70
|
3,5 - 16
|
127
|
5 - 32
|
203 - 219
|
8 - 45
|
|
73 - 76
|
3,5 - 20
|
133
|
5 - 35
|
|
|
|
82,5 - 83
|
3,5 - 22
|
140
|
5 - 36
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|
|
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Mechanical properties
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|
Steel Grade
|
TS, N/mm2(min)
|
YS,N/mm2 (min)
|
E, % (min)
|
|
10
|
353
|
216
|
24
|
|
20
|
412
|
245
|
21
|
|
35
|
510
|
294
|
17
|
|
45
|
588
|
323
|
14
|
|
10Mn2
|
421
|
265
|
21
|
|
20Cr
|
431
|
-
|
16
|
|
40Cr
|
657
|
-
|
9
|
|
30CrMnSi
|
686
|
-
|
11
|
|
15CrMo
|
431
|
225
|
21
|
|
30CrMn
|
588
|
392
|
13
|
|
Chemical composition (%, max)
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|
Steel Grade
|
C
|
Si
|
Mn
|
Cr
|
Ni
|
Mo
|
S
|
P
|
Cu
|
N
|
|
10
|
0,07-0,14
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0,17-0,37
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0,35-0,65
|
0,15
|
0,3
|
-
|
-
|
-
|
-
|
-
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|
20
|
0,17-0,24
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0,17-0,37
|
0,35-0,65
|
0,25
|
0,25
|
|