904L, also known as 1.4539, is a high-alloy austenitic stainless steel. It is a low-carbon, high-nickel, molybdenum-bearing alloy that is known for its excellent corrosion resistance, especially in highly acidic environments. 904L is also known for its high resistance to pitting and crevice corrosion, making it an ideal choice for applications in harsh environments such as chemical processing, oil and gas production, and marine environments.

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The high nickel and molybdenum content of 904L give it excellent corrosion resistance, while the low carbon content helps to prevent carbide precipitation and intergranular corrosion. Additionally, the high copper content gives 904L improved resistance to reducing acids, such as sulfuric and phosphoric acids.

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Due to its excellent corrosion resistance and high strength, 904L is commonly used in a wide range of industries and applications, including:

• Chemical processing

• Oil and gas production

• Marine environments

• Pharmaceutical and food processing

• Pulp and paper production

• Power generation

It is important to note that the chemical composition, physical properties and mechanical properties of 904L may vary depending on the manufacturer or supplier, and it is always recommended to check the certificate of analysis before using it in any application.