347 stainless steel welded tube has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). It also has good oxidation resistance and creep strength to 1500°F (816°C), as well as good low temperature toughness.

Our 347 stainless steel welded tube has excellent forming and welding qualities and can be easily fabricated by standard shop practices .

Intergranular corrosion, a phenomenon that occurs along the grain boundaries of a material, can significantly compromise the structural integrity and longevity of stainless steel. However, 347 stainless steel welded tubes exhibit impressive resistance to this type of corrosion due to their unique composition and processing.

The key factor contributing to the intergranular corrosion resistance of 347 stainless steel is its niobium content. Niobium, also known as columbium, forms stable carbides with carbon, preventing the chromium from precipitating out of the alloy as chromium carbides along the grain boundaries. This phenomenon, known as sensitization, is a primary cause of intergranular corrosion.

By inhibiting sensitization, niobium ensures that the grain boundaries remain free from chromium-depleted zones, maintaining the overall corrosion resistance of the material. This property is particularly valuable in applications where exposure to high temperatures can trigger sensitization and subsequent intergranular corrosion.

In 347 stainless steel welded tubes, the intergranular corrosion resistance is further enhanced by the controlled addition of titanium. The formation of titanium carbides at elevated temperatures helps to bind any available carbon, leaving chromium in the alloy to form a protective oxide layer, which prevents corrosive agents from attacking the grain boundaries.

Oxidation, a chemical reaction between a material and oxygen, can lead to the degradation of metals, particularly at elevated temperatures. However, 347 stainless steel welded tubes are well-known for their remarkable oxidation resistance, making them an ideal choice for applications in high-temperature environments.

The impressive oxidation resistance of 347 stainless steel is primarily attributed to its chromium content. Chromium forms a thin, adherent oxide layer on the surface of the material when exposed to oxygen. This protective oxide layer acts as a barrier, preventing further reaction between the metal and oxygen, effectively shielding the underlying material from oxidation.

Additionally, the inclusion of niobium in the composition of 347 stainless steel further enhances its oxidation resistance. Niobium stabilizes the material’s microstructure at high temperatures, reducing the formation of chromium carbides that could otherwise lead to sensitization and subsequent degradation.

In industries and applications where extreme temperatures are a constant factor, the performance of materials is put to the test. This is where the high temperature performance of 347 stainless steel welded tubes shines. These tubes are specifically designed to maintain their structural integrity and mechanical properties even when subjected to elevated temperatures.

The key to the high temperature performance of 347 stainless steel lies in its composition. The addition of niobium, also known as columbium, plays a crucial role. Niobium forms stable carbides that prevent the precipitation of harmful chromium carbides at elevated temperatures, a phenomenon known as sensitization. This ensures that the material remains resistant to intergranular corrosion and maintains its toughness and strength, even when exposed to high heat.

The 347 stainless steel welded tubes can operate at temperatures ranging from 800 to 1500°F (427 to 816°C), making them well-suited for applications in industries like petrochemical, aerospace, and power generation. Their ability to withstand these temperatures without compromising their properties makes them a reliable choice for components that operate under extreme conditions.

Furthermore, the high temperature performance of these tubes is not limited to their mechanical properties alone. They also exhibit excellent oxidation resistance, which means that they can maintain their surface quality and appearance even at elevated temperatures. This attribute is particularly valuable for applications where aesthetics and functionality go hand in hand.

In demanding industrial applications, where materials are exposed to prolonged elevated temperatures, creep becomes a significant consideration. Creep is the gradual deformation that occurs in materials over time when subjected to constant stress at high temperatures. The creep strength of 347 stainless steel welded tubes makes them a preferred choice for such environments.

The addition of niobium (columbium) in the composition of 347 stainless steel plays a crucial role in enhancing its creep strength. Niobium forms stable carbides that resist the formation of harmful precipitates, ensuring the material’s resistance to sensitization even during long-term exposure to elevated temperatures.

The 347 stainless steel welded tubes exhibit excellent creep resistance within the temperature range of 800 to 1500°F (427 to 816°C). This property is particularly vital in applications like petrochemical processing, thermal power generation, and aerospace, where components need to withstand constant stress at high temperatures without significant deformation.

The superior creep strength of these tubes is a result of their careful alloy design and manufacturing processes. This aspect sets them apart from standard stainless steels, making them a reliable choice for applications that demand consistent performance over extended periods in challenging conditions.

While high-temperature performance is crucial, the ability of a material to maintain its mechanical properties in low-temperature environments is equally important, especially in industries like cryogenics, aerospace, and chemical processing. The low-temperature toughness of 347 stainless steel welded tubes makes them a reliable choice for such applications.

The composition of 347 stainless steel includes elements like niobium and titanium, which contribute to the alloy’s enhanced low-temperature properties. These elements aid in stabilizing the material’s microstructure, preventing the formation of harmful phases that can lead to embrittlement.

The low-temperature toughness of these tubes is evident in their ability to resist brittle fracture even when subjected to sub-zero temperatures. This property ensures that the tubes maintain their structural integrity and mechanical strength in extreme cold conditions, safeguarding the performance of critical components and systems.

The improved low-temperature toughness of 347 stainless steel welded tubes makes them well-suited for applications in Arctic environments, cryogenic storage, and any scenario where exposure to low temperatures is a concern. Their ability to withstand cold-induced stresses without compromising on performance highlights their reliability and versatility.