Stainless steels used in boiler applications include:
Austenitic Stainless Steel:
304: Commonly used for its good corrosion resistance and weldability. It is suitable for various boiler components but may not be ideal for high chloride environments.
316: Preferred for applications exposed to corrosive environments, especially in chemical processing or marine applications. It offers better resistance to pitting and crevice corrosion compared to 304.
Ferritic Stainless Steel:
430: Used in some boiler applications for its moderate corrosion resistance and good oxidation resistance at high temperatures. However, it has lower strength compared to austenitic grades.
444: This grade has better corrosion resistance than 430 and is suitable for applications requiring moderate strength and good oxidation resistance.
Duplex Stainless Steel:
2205: Known for its high strength and resistance to stress corrosion cracking, making it suitable for pressure vessels and heat exchangers in boilers. It combines the properties of austenitic and ferritic stainless steels.
Super Austenitic Stainless Steel:
904L: This grade is designed for extremely corrosive environments and is often used in chemical processing industries. It provides excellent resistance to both localized and uniform corrosion.
The choice of stainless steel for boiler applications depends on factors like temperature, pressure conditions, and the corrosive nature of the environment. It's essential to select a grade that meets the specific requirements of the application.
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