DIN 17175 St35.8 Seamless Steel Tubes description
St35.8 seamless steel pipe complies with the DIN17175 standard, which strictly regulates the chemical composition, mechanical properties, process performance, and non-destructive testing of the pipes. For example, in terms of dimensional tolerances, the wall thickness tolerance for hot-rolled pipes is controlled within ±12.5%, while for cold-drawn pipes, it can reach ±10%, with the outer diameter tolerance precisely controlled to ±0.5mm. Additionally, the pipes must undergo rigorous hydrostatic testing, with the test pressure calculated based on wall thickness and diameter, typically 1.5 to 2 times the working pressure.
Owing to its high-temperature and high-pressure resistance, the St35.8 seamless steel pipe is primarily used in the following applications: first, in the boiler manufacturing industry, for producing key components such as superheater tubes, reheater tubes, and guide pipes for various steam boilers; second, in the petrochemical sector, for conveying high-temperature and high-pressure oil and gas media; and third, in the power industry, for the heating surface piping systems in power plant boilers. It also finds wide applications in mechanical manufacturing and the automotive industry. In particular, in the construction of ultra-supercritical unit boilers, the St35.8 seamless steel pipe has become an irreplaceable material due to its ability to maintain excellent performance even at 570°C.
heat treatment temperature of DIN 17175 St35.8 Seamless Steel Tubes
Chemical composition of DIN 17175 St35.8
Mechanical property of DIN 17175 St35.8
Dimensions Tolerance
DIN 17175 St35.8 Seamless Steel Tube Factory
