The DIN 17175 ST35.8 seamless boiler tube is a carbon steel high-temperature resistant pipe specified by the German standard DIN 17175. It is used in high-pressure boilers (operating pressure generally above 9.8 MPa, and operating temperature between 450°C and 650°C) for heating surface tubes, economizers, superheaters, reheaters, and petrochemical industrial pipes.
Chemical Composition:
Carbon (C): Up to 0.17%
Silicon (Si): Up to 0.35%
Manganese (Mn): Up to 0.80%
Phosphorus (P) and Sulfur (S): Limited to 0.035% each for enhanced purity
Mechanical Properties:
Tensile Strength: 360–480 MPa
Yield Strength: Minimum 235 MPa
Elongation: Minimum 25%
The quality inspection requirements for DIN 17175 ST35.8 boiler tubes mainly include the following aspects:
Chemical Composition Analysis: Ensures that the content of elements such as carbon, manganese, and silicon in the material meets the standards, which is the foundation for ensuring its high-temperature resistance and mechanical properties.
Mechanical Property Testing: Includes parameters such as tensile strength, yield strength, and elongation, which must meet specified indicators to withstand high-pressure and high-temperature environments.
Non-Destructive Testing (NDT): Methods such as ultrasonic or radiographic testing are used to check for internal defects like cracks or pores in the tube, ensuring its integrity.
Hydrostatic Pressure Test: Conducts a pressure test on the tube to verify its sealing and pressure-bearing capabilities under high pressure, preventing leaks.
Dimensional and Visual Inspection: Checks the dimensional accuracy of the tube, including outer diameter, wall thickness, straightness, as well as surface defects like scratches or dents.
DIN17175 ST35.8 Boiler Tube Factory
Packaging & Shipping
bundle packing
black painting or varnish or oil coating
end plastic caps
