F904L N08904 Flange

Alloy 904L (UNS N08904) is a superaustenitic stainless steel that is designed for moderate to high corrosion resistance in a wide range of process environments. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assure good to excellent corrosion resistance. With its highly alloyed chemistry—25% nickel and 4.5% molybdenum, 904L provides good chloride stress corrosion cracking resistance, pitting and general corrosion resistance superior to 316L and 317L molybdenum enhanced stainless steels. Alloy 904L was originally developed to withstand environments containing dilute sulfuric acid. It also offers good resistance to other inorganic acids such as hot phosphoric acid as well as most organic acids. Alloy 904L is easily welded and processed by standard shop fabrication practices.

ASTM A182 F904L N08904 Flange is a type of steel flange made with the material ASTM A182 F904L N08904. These flanges are composed of 23% chromium, 19% nickel, 4% molybdenum, and 1.5% copper, which make them extremely resistant to corrosion. 

Standards: ASTM  ASME A182

Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)

Physical Properties

Density

0.287 lbs/in3

7.95 g/cm3

Electrical Resistivity

33.5 Microhm-in at 68°F

95.2 Microhm-cm at 20°C  

Melting Range

2372–2534°F

1300–1390°C 

 Specific Heat

0.11 BTU/lb-°F (32–212°F)

 450 J/kg-°K (0–100°C)

Modulus of Elasticity

 28.0 x 106 psi

190 GPa

Thermal Conductivity 212°F (100°C)

6.8 BTU/Ft-hr-°F

12.9 W/m-°K

Mechanical Properties

Typical Values at 68°F (20°C) (minimum values, unless specified)

One of the benefits of using ASTM A182 F904L N08904 Flanges is their excellent resistance to stress corrosion cracking. This is a type of corrosion that occurs when a material is exposed to both tensile stress and a corrosive environment. ASTM A182 F904L N08904 Flanges are also resistant to pitting and crevice corrosion, which can occur in harsh environments. 

Another benefit of these flanges is their good weldability. They can be easily welded using common welding techniques, such as TIG and MIG welding. This allows for easy assembly of flanged pipelines and other structures.

These flanges are commonly used in the chemical and petrochemical industries, as well as in the oil and gas industry. They can be used in applications where high levels of corrosion resistance are required, such as in acidic environments or in seawater.