DIN 17175 Alloy Steel Seamless Pipes

DIN 17175 high-temperature seamless steel pipe is a German standard seamless steel pipe designed for high-temperature environments. Its carbon content is typically between 0.10% and 0.20%. This carbon content design ensures it maintains both strength and toughness at elevated temperatures.

The pipe is usually manufactured using hot rolling processes. After hot rolling, the outer diameter tolerance is controlled within ±1.0% to ±1.5%, and the wall thickness tolerance is within ±5% to ±10%, ensuring dimensional accuracy.

DIN 17175 high-temperature seamless steel pipe exhibits excellent oxidation resistance. At temperatures up to 500-600°C, it forms a dense oxide film on its surface, preventing further oxidation. Its thermal expansion coefficient is approximately (10-13) × 10⁻⁶/°C, providing relatively stable dimensional changes in high-temperature environments and adaptability to various thermal conditions. This type of pipe is commonly used in high-temperature components of power station boilers, such as superheaters and reheaters, where its long-term creep strength meets the requirements for prolonged high-temperature operation, typically achieving a creep strength of 100-150 MPa at 500°C.

In addition to carbon, the chemical composition of DIN 17175 high-temperature seamless steel pipe includes elements such as silicon, manganese, and chromium, with chromium content around 0.5%-1.5%, which helps enhance the pipe's corrosion resistance and high-temperature strength. The pipe's hardness generally ranges between HB 120-180, striking a balance between machinability and resistance to wear and deformation at high temperatures. In terms of welding, DIN 17175 high-temperature seamless steel pipe can be welded using various methods, including manual arc welding and TIG welding. Preheating and post-weld heat treatment are essential to ensure welding quality. The pipe also exhibits good impact toughness, with an impact energy of typically 30-50 J at room temperature, allowing it to withstand certain impact loads without cracking.

Compared to ordinary seamless steel pipes, DIN 17175 high-temperature seamless steel pipes demonstrate significantly improved creep resistance at high temperatures, maintaining stable shape and performance under prolonged high-temperature and high-pressure conditions.