Implementation Standards
Seamless steel tubes for fluid transport (GB/T8163-2008) are general seamless steels for water, oil, gas and other fluids
Applicable Scope
General
boiler tubes are mainly used to make water wall tubes, boiling water
pipes, superheated steam pipes, superheated steam pipes used for
locomotive boilers, big and small smoke pipes and arch brick pipes,
etc..
The
high pressure boiler tube is mainly used to manufacture high-pressure
and ultrahigh pressure boiler superheater, reheater pipe, main steam
pipe etc..
However,
the circular tube also has some limitations, such as under the
condition of plane bending, the round tube is not as good as square and
rectangular tube bending strength, some agricultural machinery skeleton,
steel and wood furniture are commonly used square, rectangular tube.
Special shaped steel tubes with different cross section shapes are
needed for different purposes.
Chemical Composition
|
Standard
|
Grade
|
Chemical composition of fluid tube
|
|||||||
|
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
|
/
|
/
|
/
|
|
Mechanical Property
|
Standard
|
Grade
|
Tensile Strength(Mpa)
|
Yield Strength(Mpa)
|
Elongation(%)
|
|
GB/T8163
|
10
|
335～475
|
≥205
|
≥24
|
|
20
|
410～550
|
≥245
|
≥20
|
|
|
Q345
|
490～665
|
≥325
|
≥21
|
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