The DIN17175 St35.8 heat-resistant seamless steel tube is a highly specialized product designed for applications requiring exceptional thermal stability and mechanical durability. This article delves into the key chemical composition, mechanical properties, heat treatment states, dimensional specifications, impact testing, and primary applications of this premium steel tube. Additionally, we will present a supply case study from TJC Steel Group, highlighting the company's expertise in this field.

Chemical Composition

The DIN17175 St35.8 seamless steel tube boasts a balanced chemical composition that ensures superior performance. The key elements in its composition include carbon (C) at 0.17%, silicon (Si) ranging from 0.10% to 0.35%, manganese (Mn) from 0.4% to 0.8%, phosphorus (P) not exceeding 0.02%, and sulfur (S) limited to 0.025%. This composition ensures optimal heat resistance and mechanical strength.

Mechanical Properties

The DIN17175 St35.8 steel tube demonstrates impressive mechanical properties. It has a tensile strength ranging from 360 to 480 MPa, ensuring it can withstand significant tensile forces. The yield strength is greater than or equal to 225-235 MPa, indicating its ability to maintain structural integrity under stress. Furthermore, the elongation rate of at least 25% demonstrates its ductility, allowing it to deform without breaking.

Heat Treatment States

The DIN17175 St35.8 seamless steel tube is subject to various heat treatment processes to enhance its performance. Common heat treatment states include cold drawing (BK), annealing (Annealing), stress-relieving annealing (BKS), normalizing (Normalized), and bright annealing (NBK). These treatments improve the tube's dimensional stability, toughness, and resistance to corrosion and oxidation.

Dimensional Specifications

The DIN17175 St35.8 seamless steel tube is available in a wide range of dimensions. The outer diameters range from 6.35 mm to 114 mm, while the wall thicknesses vary from 0.89 mm to 15 mm. This flexibility in sizing allows for its application in various industrial settings.

Impact Testing

To ensure the reliability and safety of the DIN17175 St35.8 steel tube, rigorous impact testing is performed. These tests evaluate the tube's ability to withstand sudden impact loads without failure, crucial for applications in high-pressure and high-temperature environments.

Primary Applications

The DIN17175 St35.8 heat-resistant seamless steel tube finds extensive use in industries demanding high thermal and mechanical stability. It is commonly utilized in boilers, superheaters, reheaters, economizers, and headers in power plants. Additionally, its resistance to high temperatures and pressures makes it suitable for applications in the petrochemical industry.

TJC Steel Group Supply Case Study

TJC Steel Group, a leading provider of steel products, has a rich history of supplying DIN17175 St35.8 seamless steel tubes to various industries. The company's expertise in steel manufacturing and quality assurance ensures the delivery of premium tubes that meet the stringent requirements of its customers. One such case involved the supply of DIN17175 St35.8 tubes to a major power plant for use in its boiler system. The tubes performed exceptionally well, enduring the high temperatures and pressures encountered in the plant's operations. This case study exemplifies TJC Steel Group's commitment to delivering reliable and high-performing steel products.