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Precision Seamless Steel Structural Tubes

GB/T 8162——Chinese National Standard
GB/T 3639——Chinese National Standard
Uses: used to make pipes, containers, equipment, fittings and mechanical seamless steel pipes
The main production steel grades: 10,20,35,45, Q345 steel and so on.
Tolerance:

Steel Type

OD(D)

Pipe wall thickness(S)

Cold drawn pipe
GB/T 8162

Pipe diameter(mm)

Tolerance(mm)

Pipe wall thickness(mm)

Tolerance(mm)

 

 

 

 

>30~50

±0。3

≤30

±10%

>50~219

±0.8%

GB/T 3639
Cold rolled tube

≤32

±0。08

 

±10%

 

32-40

±0.15

 

±10%

 

42-50

±0.20

 

±10%

 

50-60

±0.25

 

±10%

 

62-670

±0。30

 

±10%

 

 

 

 

 

Mechanical Properties:

Standard

Trademark

Tensile strength(MPa)

Yield strength(MPa)

Elongation(%)

GB/T8162

10

≥335

≥205

≥24

20

≥390

≥245

≥20

35

≥510

≥305

≥17

45

≥590

≥335

≥14

Q345

≥490

≥325

≥21

15CrMo

≥440

≥295

≥22

12Cr1MoV

≥490

≥245

≥22

GB/T 3639 NBK

10

≥335

≥205

≥24

 

20

≥440

≥245

≥20

 

35

≥530

≥315

≥17

 

45

≥600

≥335

≥14

 
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Address:ChengNan Road 226, New District, Wuxi City, Jiangsu Province
TEL:0510-85381628 Fax:0510-85311360 Contact:Mr. Fei 13358118073 15006189512 Mr. Meng 13812068262
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