GB/T8163 Seamless Pipe

  • 1)GB/T8163 Seamless Pipe Sizes (O.D. x W.T):21.3 mm-914mm x 2m-60m
  • 2)Standard:GB/T8163
  • 3)GB/T8163 Seamless Pipe Steel Grade:20#,16MN,Q345B
  • 4)Surface:oiled or black painted to prevent rust
  • 5)Marking:as per customer's requirement
  • Inner packing:Caps on two ends of every pipe
  • Outer packing: Hexagonal shape bundles wrapped with strong steel trip or according to customers'requests.

Diamensional Tolerances Of GB/T8163 Seamless Pipe

Types of steel tubes

Outer diameter

Wall thickness

Cold-rolled tubes
Tube sizes(mm)

Tolerances(mm)

Tube sizes (mm)

Tolerances(mm)

>30~50

±0.3

≤30

±10%

>50~219

±0.8%

Hot-rolled tubes

>219

±1.0%

>20

±10%

Mechanical Properties Of GB/T8163 Seamless Pipe

Standard codes
Models of steel tubes

Tensite 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 Of GB/T8163 Seamless Pipe

Standard codes
Models of steel tubes

Chemical compositions(%)

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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