310/310S Heat-Resistant Stainless Steel – For Fire Exit Doors and Emergency Exit Doors
310/310S Heat-Resistant Stainless Steel (UNS S31000/S31008) is an austenitic stainless steel primarily used in high-temperature environments. Its high chromium and nickel content ensures excellent corrosion resistance and oxidation protection, making it ideal for fire exit doors and emergency exit doors that must withstand extreme conditions. Compared to austenitic 304 alloys, 310/310S stainless steel offers higher strength at room temperature, an essential property for structural components in fire-rated door assemblies.
Manufacturers like Yunnan Guangdun can supply 310/310S stainless steel in various forms such as bars, forgings, and plates, and can even customize it according to your specific requirements for fire-resistance stainless steel doors.
General Properties
309/309S and 310/310S heat-resistant austenitic stainless steels are commonly used in high-temperature environments. These alloys’ higher chromium and nickel content ensure good corrosion resistance and oxidation resistance. In comparison to 304 alloys, 310/310S stainless steel offers higher strength at ambient temperatures, which is crucial for fire exit doors and emergency exit doors in commercial and industrial settings.
Applications in Fire Protection
High-alloy stainless steels like 310/310S exhibit exceptional high-temperature strength, creep resistance, and resistance to environmental corrosion. As a result, they are widely used in fire-rated door assemblies, including fire exit doors, emergency exit doors, and high-heat environments. This makes 310/310S stainless steel a top choice for fire resistance stainless steel doors in the fire protection industry.
Industries such as chemical processing, food processing, and heat treatment also rely on these alloys for components that must endure contact with hot acids, ammonium solutions, and sulfur compounds.
Chemical Composition & Resistance
In addition to the properties that make 310/310S stainless steel ideal for high-temperature applications, its composition ensures resistance to corrosion in aqueous environments. The high nickel content offers better resistance to chloride stress corrosion cracking compared to 18-8 stainless steels, which is critical in environments where fire-rated doors are exposed to corrosive elements.
When higher aqueous corrosion resistance is required, 310/310S stainless steel is often used in operations involving concentrated nitric acid solutions, ensuring durability for fire exit doors and emergency exit doors installed in challenging environments.
High-Temperature Oxidation Resistance
310/310S stainless steel demonstrates outstanding oxidation resistance in high-temperature settings, essential for fire-resistant stainless steel doors. When exposed to elevated temperatures, the chromium content in the alloy forms a stable oxide (Cr2O3), protecting the underlying metal from further oxidation. This self-healing oxide layer is critical for the longevity of fire exit doors and emergency exit doors installed in environments prone to fire hazards or high-heat exposure.
The oxidation resistance of 310/310S stainless steel can be predicted by its chromium content, which must exceed 20% by weight. Nickel, replacing iron in the alloy, further enhances its performance at high temperatures.
Welding and Fabrication for Fire Door Manufacturing
Austenitic stainless steels like 310/310S are renowned for their ease of welding, making them ideal for the fabrication of fire exit doors and emergency exit doors. If filler metals are required, matching compositions should be used. Due to the higher alloy content, these steels can minimize cracking during welding, enhancing the structural integrity of fire-resistant stainless steel doors.
For fire exit door and emergency exit door applications, the alloy’s high thermal expansion coefficient and low thermal conductivity should be taken into account, as these factors influence the door’s ability to maintain its form under extreme heat.
