Material Properties, Manufacturing Process, and Applications of TP347H Stainless Steel Seamless Pipe

TP347H stainless steel seamless pipe, also known as 347H stainless steel pipe, is a special steel widely used in high-temperature environments. Its unique material properties and wide range of applications make 347H stainless steel pipe play a crucial role in industrial manufacturing.
TP347H Stainless Steel Seamless Pipe details
Commonly used standards: ASTM A312, ASME SA312, ASTM 213M, ASME SA213, GB/T14976
Specifications: Outer diameter 10mm~762mm, Wall thickness: 1mm~100mm.
Chemical composition of pipe material (mass fraction), %: C: 0.040~0.10, Si: ≤1.00, Mn: ≤2.00, P: ≤0.035, S: ≤0.030, Ni: 9.00～12.00, Cr: 17.00～19.00, Nb: ≥10×C%

First, the material characteristics of 347H stainless steel.
347H stainless steel belongs to austenitic stainless steel. Its chemical composition mainly includes iron, chromium, nickel, and small amounts of niobium. The chromium content is typically between 17% and 19%, the nickel content between 9% and 12%, while the addition of niobium effectively improves the steel's resistance to intergranular corrosion.
1. High-Temperature Stability: TP347H stainless steel seamless pipe exhibits excellent oxidation resistance and creep resistance at high temperatures, enabling long-term stable operation at temperatures up to 650℃ without significant performance degradation.
2. Corrosion Resistance: Due to its high chromium and nickel content, TP347H stainless steel seamless pipe performs excellently in various corrosive media, including acids, alkalis, and salts. This makes it a preferred material for the chemical, petroleum, and natural gas industries.
3. Good Machining Performance: TP347H stainless steel seamless pipe possesses excellent hot and cold working properties, and can be processed into desired shapes and sizes through forging, rolling, welding, and other methods.

Second, the Manufacturing Process of 347H Stainless Steel Seamless Pipe.
The manufacturing process of 347H stainless steel seamless pipe includes multiple stages such as raw material preparation, heating and piercing, rolling, heat treatment, and testing. 1. Raw Material Preparation: 347H stainless steel plates or round bars meeting standards are selected as raw materials. Rigorous chemical composition and mechanical property testing ensure material quality.
2. Heating and Piercing: After heating the raw materials to a suitable temperature, piercing is performed using a piercing mill to form a preliminary tube blank.
3. Rolling: The pierced tube blank undergoes multiple rolling passes, gradually reducing the wall thickness of the TP347H stainless steel seamless pipe to the required dimensions, while simultaneously improving the internal and external surface quality.
4. Heat Treatment: The rolled TP347H stainless steel seamless pipe undergoes solution treatment and stabilization treatment to improve its mechanical properties and corrosion resistance.
5. Inspection: The finished TP347H stainless steel seamless pipe undergoes comprehensive inspection, including visual inspection, non-destructive testing (such as ultrasonic testing and radiographic testing), and mechanical property testing, to ensure product quality meets relevant standards.

Third, Application Areas of 347H Stainless Steel Seamless Pipes.
Due to its unique material properties, 347H stainless steel seamless pipes are widely used in multiple fields.
1. Power Industry: In supercritical and ultra-supercritical power generation units, 347H stainless steel seamless pipes are used as piping for high-temperature components such as superheaters and reheaters, capable of withstanding steam erosion and corrosion under high temperature and pressure.
2. Petrochemical Industry: In oil refining and chemical processes, 347H stainless steel seamless pipes are used as pipelines for transporting high-temperature corrosive media, such as furnace outlet pipes and high-temperature reactor inlet and outlet pipes.
3. Nuclear Power Industry: In nuclear power plants, 347H stainless steel seamless pipes are used as structural materials for key equipment such as reactor pressure vessels and steam generators, ensuring their long-term stable operation.

Fourth, Market Prospects of 347H Stainless Steel Seamless Pipes.
With the continuous development of the global economy and the accelerated pace of industrialization, the market demand for 347H stainless steel seamless pipes is showing a steady growth trend. Especially in fields such as new energy, environmental protection, and high-end manufacturing, the application of 347H stainless steel seamless pipes will become even more widespread.
- Environmental Protection: In the environmental protection industry, 347H stainless steel seamless pipes are used to treat various corrosive waste gases and liquids, playing a significant role in reducing environmental pollution and protecting the ecological environment.
- High-end Manufacturing: In high-end manufacturing fields such as aerospace and precision instruments, the requirements for materials are extremely high. 347H stainless steel seamless pipes, with their excellent mechanical properties and corrosion resistance, can meet the high requirements of these fields.
- International Market: With the deepening development of global trade, the demand for 347H stainless steel seamless pipes in the international market is also constantly increasing. Especially in developing countries and regions, with the continuous improvement of infrastructure construction and the advancement of industrial upgrading, the demand for 347H stainless steel seamless pipes will be even stronger.

Fifth, Conclusion
In summary, 347H stainless steel pipe, as a high-performance special steel, has demonstrated its unique advantages and broad application prospects in multiple fields. With continuous technological advancements and market expansion, the manufacturing process of 347H stainless steel seamless pipes will be continuously optimized and improved, further enhancing product quality. Simultaneously, demand for 347H stainless steel seamless pipes from related industries will continue to grow, providing strong support for its market development. In the future, 347H stainless steel seamless pipes will play a vital role in more fields, making a greater contribution to promoting global economic development and progress.