What is 347 stainless steel?

347 stainless steel is a chromium-nickel alloy stainless steel that contains niobium. It has good high temperature corrosion resistance and is suitable for use in high temperature environments, such as in heaters and furnaces. In addition, 347 stainless steel also has anti-oxidation and anti-corrosion properties, and it also performs well in some chemical industry and marine applications.

What is the chemical composition of 347 stainless steel?

The chemical composition of 347 stainless steel is as follows:

Chromium (Cr): 17.00%-19.00%

Nickel (Ni): 9.00%-13.00%

Niobium (Nb/Ta): 10*C-1.10% (C is carbon content)

Manganese (Mn): 2.00% (Maximum)

Silicon (Si): 1.00% (Maximum)

Phosphorus (P): 0.040% (maximum)

Sulfur (S): 0.030% (maximum)

Carbon (C): 0.08% (maximum)

In addition, 347 stainless steel also contains a small amount of iron, nitrogen, molybdenum and other impurity elements.

Mechanical properties of 347 stainless steel

347 stainless steel has the following mechanical properties:

Tensile Strength: ≥515 MPa

Yield Strength: ≥205 MPa

Elongation: ≥40%

Hardness: ≤201HB; ≤95HRB; ≤219HV

Among them, the tensile strength refers to the maximum stress value that the material bears during the stretching process, and the yield strength refers to the maximum stress value that the material bears when it begins to undergo plastic deformation. Elongation indicates how many percent a material can stretch before stretching to rupture, and hardness refers to the material's ability to resist scratches and indentations. These mechanical properties can be tuned and optimized according to specific application requirements.

Physical properties of 347 stainless steel

347 stainless steel is a high temperature stainless steel with good physical properties. The following are its main physical properties:

Density: 7.96 g/cm³;

Melting point: 1398-1446°C;

Thermal expansion coefficient: 16.5 μm/(m K) (20-100°C);

Thermal conductivity: 16.2 W/(m K) (100°C);

Resistivity: 73.0 nΩ·m (20°C).

In addition, 347 stainless steel also has excellent corrosion resistance, especially for corrosion and oxidation in high temperature environments.

What welding wire is used for 347 stainless steel?

347 stainless steel is usually welded with 347 type welding wire. This welding wire has a similar composition to 347 stainless steel, which ensures that the welded connection has similar properties and corrosion resistance to the base metal. At the same time, in the welding process, the use of 347 welding wire can also reduce the risk of intergranular corrosion and improve the quality of the weld. If you need to weld at high temperature, you can choose 347H welding wire. Its carbon content is slightly higher than that of 347 welding wire, and it can maintain better stability and strength under high temperature conditions.

How about the machinability of 347 stainless steel?

347 stainless steel has good machinability, but compared with some low alloy steels, its processing difficulty is slightly higher. When cutting 347 stainless steel, it is necessary to use carbide tools and use appropriate coolant. In addition, to avoid chips getting stuck or jamming the tool during machining, adequate feed rates and appropriate depths of cut must be maintained. If precision machining is required, it is recommended to anneal the material before machining to improve its machining performance. In general, the cutting performance of 347 stainless steel is relatively good, as long as the correct processing methods and skills are mastered, efficient and precise processing can be achieved.

Is 347 stainless steel food grade?

347 stainless steel can meet food grade requirements and is widely used in food processing industry. It is a high-temperature and corrosion-resistant material with good biocompatibility and antibacterial properties, and at the same time does not produce any harmful substances to food. In order to ensure that 347 stainless steel meets food-grade standards, strict control measures need to be taken during production and processing, such as keeping equipment and the environment clean, using standard welding materials, etc. In addition, when processing and using 347 stainless steel, it is necessary to avoid contact with other substances that may contaminate food to ensure food safety and hygiene.

Is 347 stainless steel magnetic?

347 stainless steel is generally non-magnetic, but under certain conditions, it may also exhibit a certain degree of magnetism. This depends on factors such as the chemical composition of the material, processing history and external magnetic fields. Generally speaking, if 347 stainless steel contains enough chromium (usually greater than 10.5%), it will have good corrosion resistance and will not be magnetic. However, when 347 stainless steel is processed, it is subjected to large deformation during processing or annealed at high temperature, which may change its magnetic properties. Therefore, in applications where it is necessary to keep 347 stainless steel non-magnetic, it is necessary to select appropriate materials and processing methods, and carry out necessary detection and control.

Is 347 stainless steel suitable for making cars?

Yes, 347 stainless steel is commonly used to make automotive parts because it has high strength and corrosion resistance, can withstand high temperature and pressure, and also has good processability. These properties make 347 stainless steel an ideal material for engine exhaust pipes, turbochargers and other automotive parts that require high temperature and corrosion resistance.

The main use of 347 stainless steel

The main uses of 347 stainless steel are as follows:

Chemical industry: Due to its good corrosion resistance and high temperature strength, 347 stainless steel is often used in the manufacture of chemical equipment, storage tanks and pipelines.

Automotive industry: 347 stainless steel can be used to manufacture engine exhaust pipes, turbochargers and other auto parts that require high temperature and corrosion resistance.

Oil and natural gas industry: 347 stainless steel is widely used in various equipment and pipelines in oil and natural gas exploration, processing and transportation.

Medical equipment industry: Due to its excellent biocompatibility, 347 stainless steel is widely used in medical equipment, surgical instruments and other fields.

Food processing industry: 347 stainless steel can be used as a material for food processing equipment because it meets hygienic standards and is easy to clean and disinfect.