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.

GB 8163 steel pipe
Diamensional Tolerances
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(%)
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(%)
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 / / /
Additional Condition

Tubing shall be made seamless, plain or upset and coupling with high-seal connections. Coupling-free connections are possible.



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


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