Stainless Steel 347 Furnace Tubes

What temperature range is stainless steel 347 / 347H suitable for in furnace applications?
Stainless Steel 347 / 347H Furnace Tubes are highly suitable for a wide temperature range in furnace applications. These tubes offer excellent thermal stability and can withstand elevated temperatures without significantly degrading their mechanical properties. Typically, stainless steel 347 / 347H is capable of operating in temperatures ranging from approximately 800°C (1472°F) up to 1600°C (2912°F).

This impressive temperature range makes them ideal for various industrial furnace applications requiring high heat resistance. The alloy's superior heat resistance is primarily attributed to adding niobium, which forms carbides that stabilize the structure and prevent sensitization and intergranular corrosion at elevated temperatures. As a result, stainless steel 347 / 347H furnace tubes provide long-lasting performance and reliability in demanding furnace environments where temperature fluctuations and thermal stress are common.

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What are the key properties of stainless steel 347 / 347H furnace tubes?
Stainless Steel 347 Furnace Tubes possess several key properties that make them highly suitable for various applications. These tubes exhibit excellent corrosion resistance, particularly against intergranular corrosion and high-temperature oxidation. Adding niobium allows for carbide formation, which helps prevent sensitization and ensures enhanced resistance to intergranular corrosion. Stainless steel 347 furnace tubes also offer good mechanical properties, including high tensile and creep strength and weldability. Stainless steel 347 furnace tubes provide a reliable and durable solution for demanding industrial environments.

Stainless Steel 347H Furnace Tubes possess a range of key properties that make them highly suitable for furnace applications. These tubes offer excellent resistance to corrosion, particularly against intergranular corrosion and high-temperature oxidation. The higher carbon content in 347H provides improved high-temperature strength and enhanced resistance to sensitization. Stainless steel 347H furnace tubes also exhibit good mechanical properties, including high tensile and creep strength, making them capable of withstanding elevated temperatures. Additionally, they offer good weldability and are an ideal choice for applications where resistance to sensitization and intergranular corrosion is critical. Stainless steel 347H furnace tubes offer a robust and dependable solution for various industrial furnace applications.

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Selection of Materials

The materials used to make furnace tubes are typically resistant to corrosion and high temperatures. Stainless steel, alloy steel, and nickel-based alloys are common materials.

Tube Formation

The creation of the tubes is the first step in the procedure. This can be accomplished using a variety of techniques, including cold drawing, welded tube manufacture, and seamless tube extrusion. Due to their homogeneity and lack of seams that could compromise the structure, seamless tubes are frequently used for high-temperature applications.

Heating and Annealing

The tubes are subsequently put through heat-treating procedures, such as annealing. In order to reduce internal tensions, increase ductility, and improve the material's general qualities, annealing entails heating the tubes to a certain temperature and then gradually cooling them.

Cutting and Sizing

The tubes are sized and cut to the required lengths in accordance with the application's requirements. In order to ensure a perfect fit inside the furnace or heat exchanger, precise cutting and sizing are essential.

Surface Treatment

Depending on the application, the tubes may also go through passivation or pickling as additional surface treatments. By removing oxides, scale, and other contaminants from the surface, these processes increase corrosion resistance.

Quality Control

Quality control procedures are used all through the manufacturing process to guarantee that the tubes meet the necessary requirements. This entails a variety of tests, including visual inspections, non-destructive testing techniques like ultrasonic or radiographic testing, and dimensional checks.

Final Heat Treatment (Optional)

To achieve the appropriate mechanical and metallurgical qualities, the tubes may go through a final heat treatment procedure, such as stress relieving or solution annealing, depending on the material and desired properties.

Finishing

The tubes might undergo further finishing processes such as polishing, buffing, or coating to meet specific application requirements or aesthetic preferences.

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