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904L / 1.4539

904L, also known as UNS N08904 or 1.4539, is a high-alloy austenitic stainless steel that is known for its excellent resistance to both strong reducing acids, such as sulfuric acid, and chloride-containing media. This makes it a popular choice for use in a wide range of chemical processing, petrochemical, and marine applications.

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.

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.

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.

Chemical Composition of 1.4539/904L

The chemical composition of 904L typically includes:

  • Carbon (C): 0.020% maximum

  • Manganese (Mn): 2.00% maximum

  • Phosphorus (P): 0.045% maximum

  • Sulfur (S): 0.035% maximum

  • Chromium (Cr): 19.00-23.00%

  • Nickel (Ni): 23.00-28.00%

  • Molybdenum (Mo): 4.00-5.00%

  • Copper (Cu): 1.00-2.00%

  • Nitrogen (N): 0.10% maximum

  • Iron (Fe): Balance

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.

The physical properties of 904L are:

  • Density: 8 g/cm3

  • Melting Point: 1320-1390 °C (2400-2550 °F)

  • Modulus of Elasticity: 193 GPa (28 x 106 psi)

The mechanical properties of 904L at room temperature are:

  • Tensile Strength: 515-690 MPa (75-100 ksi)

  • Yield Strength: 215-390 MPa (31-57 ksi)

  • Elongation: 35-45%

  • Hardness (Brinell): 217-269 HB

Physical & Mechanical Properties of 904L / 1.4539

Variants of 904

904L is a type of stainless steel alloy that contains high levels of chromium, nickel, and molybdenum. There are several variants of 904L, including:

  • 904L Super Austenitic: This variant of 904L has a higher molybdenum content than standard 904L, which makes it more resistant to pitting and crevice corrosion.

  • 904L Maraging: This variant of 904L is used in aerospace and nuclear applications due to its high strength and corrosion resistance.

  • 904L Duplex: This variant of 904L is a duplex stainless steel that combines the properties of both ferritic and austenitic steels, resulting in a material with high strength and corrosion resistance.

  • 904L Hyper Duplex: This variant of 904L is a super duplex stainless steel that has even higher strength and corrosion resistance than standard duplex 904L.

  • 904L Super Austenitic-Duplex: This variant of 904L combines the properties of both 904L Super Austenitic and 904L Duplex, resulting in a material with very high strength and corrosion resistance.

It's important to note that these variants may have different chemical compositions, mechanical properties and application.

AVAILABLE FORMS

Intamet offers 904L in a wide range of forms, including the below:

Stacked Pipes
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