Boiler Steel Pipe

Boiler Steel Pipe refers to a specialized category of seamless or welded steel tubes engineered explicitly for service in boiler systems and pressure vessel applications. These pipes are designed to operate under extreme conditions, including sustained high temperatures and high pressures, while containing water, steam, or other thermal transfer fluids.

Boiler Steel Pipe
Boiler Steel PipeBoiler Steel Pipe
    • Exceptional High-Temperature Strength: These pipes are manufactured from steels formulated to retain high tensile and yield strength at elevated temperatures, typically up to 600°C and beyond. This prevents creep deformation—a slow, permanent stretching under stress—which is a primary failure mode in high-temperature service.
    • Superior Oxidation and Corrosion Resistance: The alloys used exhibit strong resistance to oxidation (scaling) on the outer surface when exposed to hot flue gases, and to corrosion on the inner surface from treated boiler water and steam.
    • Excellent Microstructural Stability: The steel's microstructure is designed to remain stable over long periods at high temperatures, preventing the formation of brittle phases and ensuring long-term ductility and toughness.


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Boiler Steel Pipe Technical

Chemical Components & Mechanical Properties

Standard Grade Chemical Components (%) Mechanical properties
C Si Mn P S Tensile Strength(Mpa) Yield Strength(Mpa) Elongation(%)
ASTM A179 0.06-0.18 – 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
A192 0.06-0.18 ≤0.25 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
ASME SA210C ≤0.35 ≥0.10 0.29-1.06 ≤0.025 ≤0.020 ≥485 ≥275
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
Out Diameter Tolerance

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

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


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