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Seamless steel tubes

Standard: GB/T8163--Chinese national standard
Use: General seamless steel tubes for fluid transport
The main production steel grades: 10,20, Q345, etc.
Tolerance:

Steel Type

Diameter (D)

Pipe wall thickness(S)

Cold drawn pipe

Pipe diameter(mm)

Tolerance(mm)

Pipe wall thickness(mm)

Tolerance(mm)

>30~50

±0。3

≤30

±10%

>50~219

±0.8%

Mechanical Properties:

Standard 

Trademark

Tensile strength (MPa)

Yield Strength (MPa)

Elongation (%)

GB/T8163

10

335~475

≥205

≥24

20

410~550

≥245

≥20

Q345

490~665

≥325

≥21

Chemical composition:

Standard

Trademark

Chemical composition (%)

C

Si

Mn

P

S

Cr

Ni

Cu

GB/T8163

10

0.07~0.14

0.17~0.37

0.35~0.65

≤0.035

≤0.035

≤0.15

≤0.25

≤0.25

20

0.17~0.24

0.17~0.37

0.35~0.65

≤0.035

≤0.035

≤0.25

≤0.25

≤0。25

Q345

0.12~0.20

0。20~0。55

1。20~1。60

≤0.045

≤0。045

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