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Seamlsess Steel Pipe Standard(5)-GB8163

The chemical composition, mechanical properties:

standard

Grade

chemical composition (%)

C

Mn

Si

Cr

Ni

Cu

P.S

GB/T8163

10

0.070.13

0.350.65

0.170.37

0.15

 0.30

 0.25

 0.030

20

0.170.23

0.350.65

0.170.37

0.25

 0.25

 0.25

 0.030

Q345

0.120.20

1.201.60

0.200.55

 

 

 

 0.030

Mechanical Properties

Tensile Strength (MPa)

Yield Strength (MPa)

Elongation (%)

10

335475

 205

 24

20

410550

 245

 20

Q345

490665

 325

 21
















Dimensions and Tolerances:

Steel pipe type

Pipe sizes

Tolerance

mm

Normal

expert

Hot rolled (extrusion, expanding tube

Outside Diameter

All

+1%min+0.50

-

Wall Thickness

All

+15%min +0.45

-

-12.5%min -0.40

Cold drawing (rolling) tube

Outside Diameter

6~10

+0.20

+0.15

>10~30

+0.40

+0.20

>30~50

+0.45

+0.30

>50

+1%

+0.8%

Wall Thickness

1

+0.15

+0.12

>1~3

+15%

+12.5%

-10%

-10%

>3

+12.5%

+10%

-10%

* note: not less than 351 mm in diameter thermal expanding, wall thickness tolerance of +18