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347 Stainless Steel: Composition, Properties, and Applications

19 December 2023

1. Introduction

347 stainless steel is a widely used alloy in industrial applications, known for its excellent corrosion resistance and high-temperature strength. This article provides a detailed overview of the composition, properties, and applications of 347 stainless steel, further illustrating its advantages through numerical data.

2. Composition

The chemical composition of 347 stainless steel is typically as follows:

ElementContent (%)

Iron (Fe)58-63

Chromium (Cr)17-19

Nickel (Ni)9-13

Nitrogen (N)0.18-0.28

The content of these elements determines the characteristics and properties of 347 stainless steel.

3. Properties

  1. Corrosion Resistance: According to ASTM B 666, 347 stainless steel maintains its corrosion resistance in nitric acid concentrations ≤65% at boiling temperatures. Specifically, in a 65% nitric acid solution, 347 stainless steel retains its corrosion resistance, whereas other common stainless steel alloys may experience corrosion.
  2. Heat Resistance: 347 stainless steel exhibits excellent heat resistance, maintaining its properties at high temperatures. For instance, it can retain its strength and ductility at temperatures up to 800°C.
  3. Mechanical Properties: 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.
  4. Processability: 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.

4. Applications

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.

5. Conclusion

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.

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