309 Stainless Steel Pipe/Tube Details
Overview
309 stainless steel pipe/tube is an austenitic stainless steel known for its high-temperature oxidation resistance and excellent strength at elevated temperatures. It is primarily used in applications where resistance to heat and corrosion is essential, making it suitable for use in high-temperature environments and harsh conditions.
Key Characteristics
High-Temperature Resistance: Provides superior resistance to oxidation and maintains strength at temperatures up to 2000°F (1093°C).
Excellent Corrosion Resistance: Offers good resistance to oxidation, sulfidation, and other forms of high-temperature corrosion.
Good Strength: Maintains high tensile and yield strength, even at elevated temperatures.
Formability: Easily formed and fabricated into various shapes and sizes.
Weldability: Can be welded using standard techniques, although preheating and post-weld heat treatment may be required for optimal results.
Magnetic Properties: Typically non-magnetic in the annealed condition, but may become slightly magnetic when cold-worked.
Chemical Composition
Carbon (C): ≤ 0.20%
Manganese (Mn): 2.00-3.00%
Silicon (Si): ≤ 1.00%
Phosphorus (P): ≤ 0.045%
Sulfur (S): ≤ 0.030%
Chromium (Cr): 24.00-26.00%
Nickel (Ni): 12.00-15.00%
Common Applications
High-Temperature Furnaces: Used in furnace parts, such as heat shields and combustion chambers, due to its excellent high-temperature oxidation resistance.
Exhaust Systems: Applied in industrial exhaust systems, including those in power plants and petrochemical facilities, for its durability under high temperatures.
Heat Exchangers: Suitable for use in heat exchangers and other equipment exposed to high temperatures and corrosive environments.
Chemical Processing: Employed in chemical processing equipment that operates at elevated temperatures and aggressive conditions.
Oven Linings: Used in oven linings and other high-temperature industrial applications where oxidation resistance is critical.
Advantages
Superior High-Temperature Performance: Maintains strength and resists oxidation at elevated temperatures, making it suitable for extreme environments.
Excellent Corrosion Resistance: Offers good resistance to oxidation and other forms of corrosion, extending the lifespan of components.
Good Strength: Provides high mechanical strength even in high-temperature applications.
Versatile Fabrication: Can be easily formed and welded into various shapes and sizes, allowing for flexible design and construction.
Cost-Effective: Offers high performance for high-temperature applications at a relatively lower cost compared to more specialized alloys.
Summary
309 stainless steel pipe/tube is an austenitic stainless steel designed for high-temperature applications requiring excellent oxidation resistance and strength. Its chemical composition provides durability and performance in harsh environments, making it ideal for use in high-temperature furnaces, exhaust systems, heat exchangers, chemical processing, and oven linings. Offering a combination of high-temperature performance and versatility, 309 stainless steel is a reliable choice for demanding applications.
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