ThePipingMart Blog Products Stainless Steel 904L Flanges – Composition, Properties and Uses

Stainless Steel 904L Flanges – Composition, Properties and Uses

Stainless Steel 904L Flanges

SS 904L is one of the most versatile materials in the market. Its distinct physical and mechanical properties make it suitable for various industrial applications, including the manufacturing of flanges. Alloy 904L flanges are high-performance components designed to handle harsh corrosive environments making them ideal for use in chemical reactors, evaporators, and other similar applications. This blog will explore the composition, physical and mechanical properties, uses, and heat treatment options for 904L stainless steel flanges.


What are Stainless Steel 904L Flanges?

Alloy 904L Blind Flanges are pipe fittings with wide applications in the chemical, oil and gas industries. It is a low-carbon, high-alloy austenitic stainless steel grade with excellent corrosion resistance properties and good weldability and formability, making it an ideal choice for many applications.

SS 904L Flanges Composition:

904L SS Flanges are made from an austenitic stainless steel alloy known as N08904. This alloy contains low amounts of carbon, making the material more corrosion-resistant. Additionally, the alloy has a high concentration of nickel and molybdenum, which enhances its strength and durability.

Grade C Mn Si P S Cr Mo Ni Cu
SS 904L 0.020 max 2 max 1.00 max 0.040 max 0.030 max 19.00 – 23.00 4.00 – 5.00 max 23.00 – 28.00 1.00 – 2.00

904L Stainless Steel Flanges Physical Properties

One of the most notable physical properties of SS 904L Plate Flange is its ability to resist corrosion. It is also highly resistant to low-temperature scaling, fatigue, and stress corrosion cracking. The flanges have a 7.95 g/cm3 density and a melting point of 1350 degrees Celsius.

SS 904L Flanges Mechanical Properties

Stainless steel 904L flanges exhibit impressive mechanical properties. They have a yield strength of 220 MPa, a tensile strength of 490 MPa, and a 35% elongation capacity. This makes them perfect for applications that require both high strength and durability.

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.95 g/cm3 1350 °C (2460 °F) Psi – 71000 , MPa – 490 Psi – 32000 , MPa – 220 35 %

904L SS Flanges Equivalent

SS 904L 1.4539 N08904 SUS 904L 904S13 STS 317J5 Z2 NCDU 25-20 X1NiCrMoCu25-20-5

Stainless Steel 904L Flanges Uses

Due to their unique properties, UNS N08904 flanges are widely used in multiple industries. In the pharmaceutical industry, they are used to manufacture chemical reactors and evaporators. They are also used extensively in the food processing industry to manufacture storage tanks, heat exchangers and pollution control equipment. Additionally, they have proven valuable in oil and gas companies for applications such as offshore rigs where seawater corrosion is prevalent.

Stainless Steel 904L Flanges Heat Treatment

DIN 1.4539 Nippo Flanges  can be heat treated to enhance their mechanical properties. The process usually involves heating the flanges to a specific temperature (1050-1150°C) and cooling them rapidly in water. After heat treatment, their strength and corrosion resistance are further improved, making them capable of withstanding harsh environments.

Stainless Steel 904L Flanges Corrosion Resistance

One of the key properties of ASME SA182 SS 904L WNRF Flanges  is their high corrosion resistance, making them a popular choice in harsh environments. This resistance is mostly due to the alloy’s high concentration of nickel and molybdenum. Their low carbon content makes them more resistant to stress corrosion cracking.


SS 904L Plate Flange offer impressive physical and mechanical properties, making them an excellent choice for applications that require high strength, durability, and corrosion resistance. Their unique composition and heat treatment options make them ideal for various industries, including chemical processing, food, and oil and gas. These reliable flanges provide long-term solutions, making them an excellent investment in the manufacturing industry.

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