Changzhou Tengyue has specilized in manufacturing stainless steel seamless pipe and tube since 1991.
We are one of the largest and best manufacturer of stainless steel tube for heat exchanger in China.
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GOST 8734-75. Seamless Steel Tubes Cold-Formed

S 5,5 - 12 mm: ± 8%

Notes
:
  1. Steel grades: 10, 20, 35, 45, 10Mn2, 15Cr, 20Cr, 40Cr, 30CrMnSi, 15CrMo acc. to GOST 1050-88, GOST 19281-89, GOST 4543-71. Others steel grades are available subject to agreement.
  2. Dimensions and tolerances acc. to GOST 8734-75.
  3. Technical requirements acc. to GOST 8733-74.
  4. Length from 1.5 to 11.5 m depending on diameter and wall thickness.

Sizes
OD, mm
WT, mm
OD, mm
WT, mm
OD, mm
WT, mm
5
0,5 - 1,5
16 - 20
0,4 - 5
45 - 48
1 - 10
6
0,5 - 2
21 - 22
0,4 - 6
50 - 56
1 - 12
7 - 8
0,5 - 2,5
23 - 24
0,5 - 4
57 - 70
1,5 - 12
9
0,4 - 3
25 - 28
1 - 7
73 - 95
2 - 12
10 - 12
0,4 - 3,5
30 - 36
1 - 8
100 - 130
2,5 - 12
13 - 15
0,4 - 4
38 - 42
1 - 9
140
3 - 12

Mechanical properties
Steel Grade
Tensile Strength, N/mm2 (min)
Yield Strength, N/mm2 (min)
Elongation, % (min)
10
343
206
24
20
412
245
21
35
294
17
45
589
323
14
10Mn2
422
245
22
15Cr
412
-
19
20Cr
431
-
17
40Cr
618
-
14
30CrMnSi
491
-
18
15CrMo
431
226
21

Chemical Composition (%, max)
Steel Grade
C
Si
Mn
Cr
Ni
Mo
S
P
Cu
N
10
0,07-0,14
0,17-0,37
0,35-0,65
0,15
0,3
-
-
-
-
-
20
0,17-0,24
0,17-0,37
0,35-0,65
0,25
0,25
-
0,03
0,025
0,30
0,008
35
0,32-0,40
0,17-0,37
0,50-0,80
0,25
0,30
-
0,04
0,035
0,30
-
45
0,42-0,45
0,17-0,37
0,50-0,80
0,25
-
-
-
-
-
-
10Mn2
0,07-0,15
0,17-0,37
1,2-1,6
0,30
0,30
-
0,035
0,035
0,30
-
20Cr
0,17-0,23
0,17-0,37
0,50-0,80
0,70-1,0
0,30
-
0,035
0,035
0,30
-
40Cr
0,36-0,44
0,17-0,37
0,50-0,80
0,80-1,10
0,30
-
0,035
0,035
0,30
-
30CrMnSi
0,28-0,34
0,90-1,20
0,80-1,10
0,80-1,10
0,30
-
0,005
0,025
-
-
15CrMo
0,11-0,18
0,17-0,37
0,40-0,70
0,80-1,10
0,30
0,40-0,55
0,025
0,025
0,30
-


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