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Boiler Pipe & Tube, Seamless Boiler Tube, High Pressure Boiler Tube, Medium and Low Pressure Boiler Tube
Standard: GB3087-1999, ASTM A179, JIS G3454, ASTM A210, ASTM A213, ASTM A192, ASTM A335, ASTM A333, ASTM A268, DIN 17175
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
Sizes:
Out diameter:10mm to 510mm
Wall thickness:1.5mm to 26mm
Boiler tube is a type of seamless tube. The manufacturing method is the same as that of seamless pipes, but there are strict requirements for the type of steel used in manufacturing steel pipes. According to the operating temperature, it is divided into two types: general boiler tubes and high-pressure boiler tubes.
The mechanical properties of boiler tubes are important indicators to ensure the final performance (mechanical properties) of steel. It depends on the chemical composition and heat treatment system of the steel. In steel pipe standards, tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness indicators are specified according to different usage requirements, as well as high and low temperature properties required by users.
① Generally, the operating temperature of boiler tubes is below 350°C, and they are mainly made of low-carbon steel hot-rolled tubes or cold-drawn tubes.
② High-pressure boiler tubes are often exposed to high temperature and high pressure conditions when used. Under the action of high-temperature flue gas and water vapor, the tubes will oxidize and corrode. Steel pipes are required to have high lasting strength, high resistance to oxidation and corrosion, and good structural stability.
Boiler tube applications:
① General boiler tubes are mainly used to make water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes and arch brick tubes, etc.
② High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam tubes, etc. for high-pressure and ultra-high-pressure boilers.
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 |
|
