347H stainless steel pipe, also known as TP347H stainless steel seamless pipe, is a specialty steel widely used in high-temperature environments. Its unique material properties and wide range of applications make 347H stainless steel pipe a vital role in industrial manufacturing.
Chemical Details of TP347H Seamless Stainless Steel Pipe
Common standards for TP347H seamless stainless steel pipe include: ASTM A312, ASME SA312, ASTM 213M, ASME SA213, and GB/T14976.
TP347H seamless stainless steel pipe specifications range from 10mm to 762mm in outer diameter and 1mm to 100mm in wall thickness.
Chemical composition of TP347H seamless stainless steel pipe (mass fraction): Carbon: 0.040-0.10%, Silicon: ≤1.00%, Manganese: ≤2.00%, Phosphorus: ≤0.035%, Sulfur: ≤0.030%, Nickel: 9.00-12.00%, Chromium: 17.00-19.00%, Niobium: ≥10×C%
First, Material Properties of TP347H Seamless Stainless Steel Pipe
347H stainless steel is a type of austenitic stainless steel. Its chemical composition primarily consists of iron, chromium, nickel, and a small amount of niobium. The chromium content typically ranges from 17% to 19%, and the nickel content from 9% to 12%. The addition of niobium effectively improves the steel’s resistance to intergranular corrosion.
1. High-Temperature Stability: 347H stainless steel exhibits excellent oxidation resistance and creep resistance at high temperatures, capable of long-term stable operation at temperatures up to 650°C without significant performance degradation.
2. Corrosion Resistance: Due to its high chromium and nickel content, 347H stainless steel performs well in a variety of corrosive media, including acids, alkalis, and salts. This makes it a preferred material for industries such as chemical, petroleum, and natural gas.
3. Good Processability: 347H stainless steel exhibits excellent hot and cold workability and can be processed into desired shapes and sizes through various methods, including forging, rolling, and welding.
Second, the manufacturing process of TP347H seamless stainless steel pipes.
1. Raw material preparation: Standard 347H stainless steel plates or round steel are selected as raw materials and undergo rigorous chemical composition and mechanical property testing to ensure material quality.
2. Heating and piercing: After heating the raw materials to the appropriate temperature, they are pierced through a piercing machine to form the initial tube billet.
3. Rolling: The pierced tube billet undergoes multiple rolling passes to gradually reduce its wall thickness to the desired dimensions while improving the internal and external surface quality of the TP347H seamless stainless steel pipe.
4. Heat treatment: The rolled TP347H seamless stainless steel pipe undergoes solution treatment and stabilization treatment to improve its mechanical properties and corrosion resistance.
5. Testing: The finished TP347H seamless stainless steel pipe undergoes comprehensive testing, 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 Pipe
1. Power Industry: In supercritical and ultra-supercritical power generation units, 347H stainless steel seamless pipe is used as tubing for high-temperature components such as superheaters and reheaters, capable of withstanding steam erosion and corrosion under high temperature and high pressure.
2. Petrochemical Industry: In oil refining and chemical processes, 347H stainless steel seamless pipe is used as piping for conveying high-temperature corrosive media, such as heating furnace outlet pipes and high-temperature reactor inlet and outlet pipes.
3. Nuclear Power Industry: In nuclear power plants, 347H stainless steel seamless pipe is used as a structural material for key equipment such as reactor pressure vessels and steam generators, ensuring long-term stable operation.
Fourth, Market Prospects of 347H Stainless Steel Seamless Pipe
- Environmental Protection: In the environmental protection industry, 347H stainless steel seamless pipe is 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: High-end manufacturing fields such as aerospace and precision instruments place extremely high demands on materials. 347H seamless stainless steel pipe, with its excellent mechanical properties and corrosion resistance, meets the high material requirements of these sectors.
- International Market: With the deepening development of global trade, demand for 347H seamless stainless steel pipe in the international market is also increasing. In developing countries and regions, the demand for 347H seamless stainless steel pipe will be particularly strong as infrastructure development and industrial upgrading continue to improve.
Fifth Conclusion
In summary, as a high-performance specialty steel, 347H seamless stainless steel pipe has demonstrated unique advantages and broad application prospects in various fields. With continuous technological advancement and market expansion, the manufacturing process of 347H seamless stainless steel pipe will continue to be optimized and improved, and product quality will be further enhanced. At the same time, demand for 347H seamless stainless steel pipe in related industries will continue to grow, providing strong support for its market development. In the future, 347H seamless stainless steel pipe will play an important role in more fields and make greater contributions to promoting global economic development and progress.
Post time: Sep-24-2025