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Views: 2 Author: Site Editor Publish Time: 2024-07-12 Origin: Site
Stainless Steel 347 is a niobium stabilized chromium nickel austenitic stainless steel with corrosion resistance similar to 304/304L. This grade is typically used in the 800-1500˚F temperature range where it is stabilized against chromium carbide precipitation by the addition of niobium, which results in the precipitation of niobium carbides. Stainless Steel 347 has excellent intergranular corrosion resistance after exposure to this temperature range, and this grade resists oxidation up to 1500˚F and has higher creep and stress rupture properties than 304/304L. It also possesses good low temperature toughness and is non-magnetic in the annealed condition.
Alloy 347 (UNS S34700) is stabilized stainless steel which offers as its main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500°F (427 to 816°C). Alloy 347 stainless steel plate is stabilized by the addition of columbium and tantalum. Alloy 347 stainless steel is also advantageous for high temperature service because of its good mechanical properties. Alloy 347 is generally used where corrosive conditions are severe, such as aircraft exhaust stacks, manifolds and ring collectors. Type 347 is also used for heavy welded assemblies which cannot be annealed after welding or where the operating conditions cause exposure within the temperature range between 800° to 1500°F.
Alloy 347 (UNS S34700) is columbium stabilized austenitic stainless steel with good general corrosion resistance and somewhat better resistance in strong oxidizing conditions than 321 (UNS S32100). It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). The alloy has good oxidation resistance and creep strength to 1500°F (816°C). It also possesses good low temperature toughness. Alloy 347 stainless steel plate cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.
Carbon: 0.08 max
Manganese: 2.00 max
Silicon: 0,75 max
Chromium: 17.00-19.00
Nickel: 9.00-12.00
Molybdenum: 0.75 max
Columbium + Tantalum: 10 x (Carbon+ Nitrogen) min-1.00 max
Phosphorus: 0.040 max
Sulfur: 0.030 max
Copper: 0.75 max Iron: Balance
Alloy 347 stainless steel exhibits good general corrosion resistance that is comparable to 304. It was developed for use in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C) where un-stabilized alloys such as 304 are subject to intergranular attack. In this temperature range, the overall corrosion resistance of Alloy 347 stainless steel is superior to Alloy 321 stainless steel. Alloy 347 also performs somewhat better than Alloy 321 in strongly oxidizing environments up to 1500°F (816°C).
The alloy can be used in nitric solutions, most diluted organic acids at moderate temperatures and in pure phosphoric acid at lower temperatures and up to 10% diluted solutions at elevated temperatures. Alloy 347 stainless steel resists polythionic acid stress corrosion cracking in hydrocarbon service. It can also be utilized in chloride or fluoride free caustic solutions at moderate temperatures. Alloy 347 stainless steel plate does not perform well in chloride solutions, even in small concentrations, or in sulfuric acid.
Stainless steel 347 can withstand high temperatures and perform well in harsh environments. Their ability to operate between -10°C and 816°C makes them suitable for applications in the petrochemical and refining industries. The addition of tantalum and columbium to their composition increases the pipes’ strength and makes them oxidation-resistant. This addition can also offer protection against polythionic acid stress corrosion cracking.
Stainless steel 347 are easy to weld thanks to their high ductility and low thermal conductivity. This makes them viable for fabricating complex structures, piping, and tanks, leading to improved project efficiency and reduced downtime. Furthermore, stainless steel 347 have excellent dimensional stability, enabling precise fabrication and fitting for different applications.
According to ASTM standards, 347 stainless steel has high strength and ductility. Its tensile strength typically ranges between 500-800 MPa, and its yield strength is between 200-400 MPa. Additionally, it has a high elongation rate and good workability.
347 stainless steel has good processing properties and can be easily cut, welded, and machined. For example, it can be welded together using welding methods such as argon arc welding. Furthermore, it can be processed using conventional cutting and machining methods.
Chemical Equipment: Due to its excellent corrosion resistance and heat resistance, 347 stainless steel is widely used in chemical equipment such as reactors and heat exchangers. Specifically, it can be used to manufacture key components such as reactor vessels, distillation columns, and absorption towers that operate in high-temperature and corrosive environments.
Aerospace: In the aerospace industry, 347 stainless steel is commonly used to manufacture critical components such as engine parts and combustion chambers. Specifically, it can be used for turbine blades and combustion chambers that operate in high-temperature and high-speed environments due to its excellent heat resistance and mechanical properties.
Energy Sector: In the renewable energy sector, such as nuclear power and solar energy, 347 stainless steel also finds wide applications. In nuclear power plants, it can be used to manufacture reactor structures, pressure vessels, and other critical components that require resistance to high temperatures and radiation.
Automotive Industry: In the automotive industry, 347 stainless steel is primarily used in the manufacture of exhaust systems and fuel systems. Specifically, it can be used for exhaust manifolds, catalytic converters, and other key components that operate in high-temperature and corrosive environments.
Construction Industry: In the construction industry, 347 stainless steel can be used in the manufacture of structural components for bridges and high-rise buildings. For instance, it can be used for bridge beams and support structures that require resistance to outdoor environments due to its excellent corrosion resistance and weatherability.
In summary, stainless steel 347 product are versatile, durable, and cost-effective, making them the ideal choice for several applications. Their properties, such as high-temperature resistance, corrosion resistance, and weldability, make them perfect for use in harsh environments. Additionally, they resist intergranular and crevice corrosion, reducing the risk of failure. If you need products made of stainless steel 347 material, please click here to contact us. 
JN Alloy can not only provide you with conventional steel pipes, steel plates, round bars, flanges, pipe fittings and other products, but also provide you with customized services and make satisfactory products according to your needs.
Through the provided data and analysis, it is evident that 347 stainless steel is a high-performance alloy with excellent corrosion resistance, heat resistance, and mechanical properties. Its wide range of applications in industries such as chemicals, aerospace, energy, automotive, and construction demonstrates its versatility and reliability. With continuous advancements in technology, the future prospects for the use of 347 stainless steel are even more promising.
