Standard: GB3087-1999, ASTM A179, ASTM A106, JIS G3454, SA-213, SA-179

Application: Used for manufacturing superheated pipelines, the steam pipe, boiling water tube, flue tube, small flue tube, etc.of low, mediam pressure boiler, the general industry boiler


Out Diameter Torlerances

Standard
Out Diameter
Tolerance
GB3087
≤180
±1.0%(min: ±0.5mm)
GB5310
≤50
±0.5mm
>50
±1.0%


Wall Thickness Tolerances

Standard
Wall Thickness(mm)
Tolerance
GB3087
3-20
+15%,12.5%
>20
±12.5%
GB5310
<3.5
+15%,-10%
3.5-20
+15%,-10%
>20
±10%


Chemical composition and mechanical properties

Standard
Grade
Chemical composition(%)
Mechanical properties
C
Si
Mn
P
S
Tensile Strength(Mpa)
Yield Strength(Mpa)
Elongation(%)
DIN17175
St35.8
≤0.17
0.10-0.35
0.40-0.80
≤0.030
≤0.030
360-480
≥235
≥25
St45.8
≤0.21
0.10-0.35
0.40-1.20
≤0.030
≤0.030
410-530
≥255
≥21





How much is the largest diameter of boiler tube?

                                                                                                                                                              ___Howar(Columbia)

The quality is good.

                                                                                                                                                              ___Gaskell(Guyana)

Logistics is very very fast. 

                                                                                                                                                              ___Noah(Germany)

Bare pipe is also good-looking.

                                                                                                                                                              ___Adolph(Yemen)

Price of tubes is cheaper than other suppliers.

                                                                                                                                                              ___Hyman(Bangladesh)