347 stainless steel is a widely recognized material known for its excellent performance in high-temperature environments and its outstanding corrosion resistance. This austenitic stainless steel grade is stabilized with titanium, which enhances its properties, making it suitable for various industrial applications. In this blog, we will delve into the unique characteristics of 347 stainless steel, including its key properties and common applications.
What is 347 Stainless Steel?
347 stainless steel is part of the 300 series of stainless steels, with the addition of niobium and titanium as stabilizers. This composition allows it to maintain its strength and stability at elevated temperatures, making it perfect for use in environments where heat is a significant factor.
Chemical Composition
The chemical composition of 347 stainless steel typically includes:
- Chromium (Cr): 17.0% to 19.0%
- Nickel (Ni): 9.0% to 13.0%
- Titanium (Ti): 5 times the carbon content, with a minimum of 0.5%
- Carbon (C): 0.08% max
- Manganese (Mn): 2.0% max
- Silicon (Si): 1.0% max
- Phosphorus (P): 0.045% max
- Sulfur (S): 0.03% max
This balanced composition contributes to the unique properties of 347 stainless steel pipes, including enhanced resistance to intergranular corrosion.
Key Properties of 347 Stainless Steel Pipe
- Corrosion Resistance
347 stainless steel exhibits excellent corrosion resistance in a variety of environments. The titanium content helps prevent intergranular corrosion, particularly in welded structures. This makes it suitable for use in acidic and high-temperature applications, where traditional stainless steels might fail.
- High-Temperature Stability
One of the standout features of 347 stainless steel is its ability to maintain strength and stability at elevated temperatures. It can withstand temperatures up to approximately 1,800°F (982°C) without losing its mechanical properties, making it an best choice for high-heat applications, such as those found in power plants and chemical processing facilities.
- Ductility and Formability
Because of its superior ductility and formability, 347 stainless steel is easily formed and fabricated into a variety of shapes, including pipes, tubes, and fittings. This property makes it versatile for different manufacturing processes and applications.
- Weldability
A lot of industrial applications require welding, and 347 stainless steel has exceptional weldability. The titanium stabilizer minimizes the formation of chromium carbides during welding, thus reducing the risk of sensitization and subsequent corrosion.
Common Applications of 347 Stainless Steel Pipe
347 stainless steel pipes are utilized across various industries due to their unique properties. Some common applications include:
- Aerospace
In the aerospace industry, 347 stainless steel is used for components that must endure extreme temperatures and corrosive environments, such as exhaust systems and jet engine components.
- Chemical Processing
The chemical processing industry benefits from the corrosion resistance of 347 stainless steel. It is used in manufacturing reactors, piping systems, and heat exchangers, where exposure to aggressive chemicals is common.
- Power Generation
347 stainless steel pipes are often found in power generation plants, particularly in boiler and heat exchanger applications. Their high-temperature stability ensures reliable performance in steam and gas environments.
- Oil and Gas
347 stainless steel is used in oil and gas industry fittings and pipelines that are subjected to extreme conditions. It is appropriate for offshore applications due to its resistance to pitting and crevice corrosion.
- Food and Beverage Industry
Due to its superior resistance to corrosion and ease of cleaning, 347 stainless steel is also used in the food and beverage industry for processing equipment, storage tanks, and piping systems.
Conclusion
347 stainless steel pipes offer a unique combination of corrosion resistance, high-temperature stability, and excellent weldability, making them a go-to material for various demanding applications. Their properties allow them to perform reliably in environments that challenge other materials, ensuring safety and longevity in industrial settings. Whether in aerospace, chemical processing, or power generation, 347 stainless steel pipes remain an essential choice for engineers and manufacturers seeking durable and efficient solutions.
Freya Parker 
Anokshi Kumari 
Arsalan Ahmad