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Stainless Steel 904L Bars – Composition, Properties and Uses

Stainless steel 904L Bars

Stainless steel is widely used in various industries today, known for its durability, strength, and corrosion resistance. Among its various grades, stainless steel 904L bars have gained immense popularity for their exceptional characteristics. In this blog post, we will explore the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance of stainless steel 904L bars. So, let’s delve into the fascinating world of this versatile material.


What are Stainless steel 904L Bars?

SS 904L Bars are nickel-chromium-molybdenum alloy stainless steel bars with good corrosion resistance, high tensile strength, and excellent weldability. They’re particularly resistant to sulphuric acid and are commonly used in chemical processing applications. These bars have relatively low carbon content making them easier to form than pure iron or other alloy variants.

Stainless steel 904L Bars Composition

SS 904L Round Bars contain a high percentage (up to 23%) of chromium, making them highly corrosion-resistant. Additionally, molybdenum (up to 5%) enhances its resistance to pitting and crevice corrosion, even in harsh environments. In addition, it contains nickel and copper, which give it high resistance to reducing and oxidizing acids. The low carbon content of 904L stainless steel bars ensures excellent weldability and low sensitization during welding.

Grade C Si Mn P N S Ni Cr
SS 904l 0.030 1.00 2.00 0.045 0.11 0.030 10.0/12.0 18.0/20.0

Stainless steel 904L Bars Physical Properties

Stainless steel 904L bars boast outstanding physical properties, making them ideal for various applications. They have a 7.95 g/cm³ density and a melting point of 1350°C. Moreover, they exhibit high toughness and flexibility, enabling them to handle high-stress levels without deformation. Stainless steel 904L bars are also highly machinable and easy to forge, thanks to their low carbon content.

Stainless steel 904L Bars Mechanical Properties

Stainless steel 904L bars offer excellent mechanical properties, including high tensile strength, yield strength, and elongation. Their tensile strength ranges between 490 and 690 MPa, while their yield strength is between 220 and 350 MPa. The 904L stainless steel bar elongation is at least 35%, indicating excellent ductility and toughness. They also exhibit high hardness and wear resistance, making them ideal for demanding environments.

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 %

Stainless steel 904L Bars Equivalent

SS 904L 1.4539 N08904 SUS 904L 904S13 STS 317J5L Z2 NCDU 25-20 X1NiCrMoCu25-20-5

Stainless steel 904L Bars Uses

UNS N08904 Hex Bar are widely used in various industries, including chemical processing, paper and pulp, oil and gas, and pharmaceuticals. Their exceptional corrosion resistance makes them ideal for use in equipment and machinery that come into contact with aggressive substances such as acids and brine solutions. Additionally, they are commonly used in heat exchangers, reactors, and storage tanks.

Stainless steel 904L Bars Heat Treatment

SS 904L Round Bars do not require heat treatment to obtain their optimum properties. However, if required, they can be annealed between 1090°C and 1175°C, followed by rapid cooling in air or water. This process can enhance their machinability and improve their dimensional stability.

Stainless steel 904L Bars Corrosion Resistance

904l Stainless Steel Round Bar are renowned for their exceptional corrosion resistance in harsh environments. Even at high temperatures, they can withstand a wide range of corrosive substances, including sulfuric, acetic, and phosphoric acid. They also exhibit excellent resistance to chloride attack, making them ideal for use in marine and coastal environments. Thanks to their high nickel and copper content, they have low corrosion rates in oxidizing acids.



DIN 1.4539 Flat Bar are a highly versatile and valuable material, offering a wide range of exceptional properties and benefits. Their composition, physical properties, mechanical properties, uses, heat treatment, and corrosion resistance make them ideal for various applications, especially in harsh and corrosive environments. They are also excellent for industries prioritizing performance, durability, and reliability. With the right handling, ASTM B649 type 904L Rod can provide outstanding service and longevity, making them a worthy investment for any company or individual who requires exceptional quality and performance.

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