GB 8163 steel pipe

GB 8163 steel pipe is a seamless steel pipe for fluid transportation (GB/T8163-2018), which is a general seamless steel pipe for conveying water, oil, gas and other fluids.


Diamensional Tolerances

Types of steel tubesOuter diameterWall thickness
Cold-rolled tubesTube 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(%)

Standard codes
Models of steel tubes
Tensite strength(MPa)Yield strength(MPa)Elongation(%)
GB/T816310335-475≥205≥24
20410-550≥245≥20
Q345490-665≥325≥21

Chemical Composition(%)

Standard codesModels of steel tubesChemical compositions(%)
CSiMnPSCrNiCu
GB/T8163100.07-0.140.17-0.370.35-0.65≤0.035≤0.035≤0.15≤0.25≤0.25
200.17-0.240.17-0.370.35-0.65≤0.035≤0.035≤0.25≤0.25≤0.25
Q3450.12-0.200.20-0.551.20-1.60≤0.045≤0.045///
Additional Condition
  • UT(Ultrasonic examination),
  • AR(As Hot Rolled only)
  • TMCP(Thermal Mechanical Control Processing)
  • N(Normalized)
  • Q+T(Quenched and Tempered)
  • Z Direction Test(Z15,Z25,Z35)
  • Charpy V-Notch Impact Test
  • The Third Party Test (such as SGS Test)
  • Coated or Shot Blasting and Painting.

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