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Stainless Steel 904L/ UB6 (1.4539)

Stainless Steel - 904l/UB6 (1.4539)

Stainless Steel 904L is a high-alloy austenitic stainless steel that is known for its excellent corrosion resistance, particularly in aggressive environments. It contains a higher percentage of nickel and chromium compared to standard austenitic stainless steels, providing enhanced resistance to various corrosive media, such as sulfuric acid, phosphoric acid, and chloride-containing solutions.

Emirerri Steel is likely a supplier or manufacturer that specializes in stainless steel products, including 904L grade stainless steel. They might offer various forms of stainless steel products such as sheets, plates, pipes, tubes, fittings, and bars made from 904L stainless steel.

Stainless Steel 904L Products

904l Pipes

Stainless Steel 904l Pipe

904l Sheets and Plates

Stainless Steel 904l Sheet & Plates


Stainless Steel 904l Flanges

904l Bars and Rods

Stainless Steel 904l Bars and Rods

904L perforated sheet

Stainless Steel 904l Perforated Sheet

Forged Components

Stainless Steel 904l Pipe Fittings


Stainless Steel 904L finds application in various industries like Chemical Processing Industry, Petrochemical Industry, Pharmaceutical Industry, Oil and Gas Industry, Food Processing Industry, Power Generation, Desalination Plants, Aerospace Industry, Water Treatment, Construction and Architecture. Stainless Steel 904L’s versatility, coupled with its resistance to a wide range of corrosive substances, makes it a popular choice in industries where durability and reliability are paramount.

Stainless Steel 904l Chemical Compositions

Element% Present (in product form)
Carbon (C)0.02
Silicon (Si)0.70
Manganese (Mn)2.00
Phosphorous (P)0.03
Sulfur (S)0.01
Chromium (Cr)19.00 – 21.00
Nickel (Ni)24.00 – 26.00
Nitrogen (N)0.15
Molybdenum (Mo)4.00 – 5.00
Copper (Cu)1.20 – 2.00
Iron (Fe)Balance

Stainless Steel 904l Mechanical Properties

Mechanical PropertiesValues
Tensile Strength (at RT)490-670 Mpa
Yield Strength (0.2% offset)220-310 Mpa
Elongation (at RT)35-40%
Hardness (Brinell)150 max
Impact StrengthGood


Stainless Steel 904l Physical Properties

Physical PropertiesValues
Density7.85 g/cm³
Melting Range1300 to 1390°C (2372 to 2534°F)
Thermal Conductivity11.5 W/(m·K)
Specific Heat Capacity20°C: 500 J/(kg·K)
Eectrical Resistivity20°C: 0.95 μΩ·m
Corrosion Resistance

Stainless steel 904L is a non-stabilized austenitic stainless steel with low carbon content. It’s renowned for its excellent corrosion resistance, especially in harsh environments. Here’s why it’s favored in corrosive settings:

  1. High Alloy Content: Stainless steel 904L has a high content of chromium, nickel, molybdenum, and copper, which contributes to its superior resistance to corrosion. Chromium forms a protective oxide layer on the surface, preventing corrosion.

  2. Molybdenum Addition: Molybdenum enhances the alloy’s resistance to reducing acids, particularly sulfuric acid, phosphoric acid, and acetic acid. This makes it suitable for applications in industries like chemical processing, pharmaceuticals, and petrochemicals.

  3. Copper Alloying: The presence of copper provides improved resistance to sulfuric acid and other reducing agents, enhancing the material’s overall corrosion resistance.

  4. Pitting and Crevice Corrosion Resistance: Stainless steel 904L exhibits resistance to both pitting and crevice corrosion, which are common forms of localized corrosion in chloride-rich environments like seawater.

  5. Resistance to Stress Corrosion Cracking: Its high nickel and molybdenum content makes it resistant to stress corrosion cracking, which is a significant concern in chloride-containing environments.

  6. Durability in High-Temperature Applications: Stainless steel 904L maintains its corrosion resistance at elevated temperatures, making it suitable for applications where exposure to high temperatures is common.

  7. Versatility: Its corrosion resistance makes it versatile for various applications including chemical processing equipment, pharmaceuticals, food processing, oil and gas, pulp and paper industries, and more.

However, despite its exceptional corrosion resistance, proper fabrication, handling, and maintenance are crucial to ensure optimal performance and longevity of stainless steel 904L in corrosive environments.

High Temperature Resistance 904l

Stainless Steel 904L exhibits excellent resistance to high temperatures, which is one of the key factors contributing to its suitability for various industrial applications. Here’s how it maintains its properties at elevated temperatures:

  1. Oxidation Resistance: Stainless Steel 904L forms a protective chromium oxide layer on its surface when exposed to high temperatures. This oxide layer acts as a barrier, preventing further oxidation of the underlying metal, even at elevated temperatures.

  2. Retention of Mechanical Properties: Unlike some other stainless steels that may experience significant degradation in mechanical properties at high temperatures, Stainless Steel 904L retains its strength, toughness, and ductility over a wide temperature range.

  3. Creep Resistance: Creep is the tendency of a material to deform slowly under mechanical stress at high temperatures. Stainless Steel 904L has good creep resistance, allowing it to maintain its shape and integrity under prolonged exposure to elevated temperatures.

  4. Stability of Austenitic Structure: Stainless Steel 904L is an austenitic stainless steel, which means it maintains its face-centered cubic (FCC) crystal structure even at high temperatures. This stability contributes to its ability to withstand thermal cycling without undergoing phase transformations or embrittlement.

  5. Resistance to Thermal Fatigue: Thermal fatigue occurs when materials experience cyclic heating and cooling. Stainless Steel 904L has a low coefficient of thermal expansion and good thermal conductivity, which help reduce the risk of thermal fatigue failure at high temperatures.

  6. Applications: Due to its high-temperature resistance, Stainless Steel 904L is used in various applications where exposure to elevated temperatures is common. These include heat exchangers, boilers, furnace components, exhaust systems, chemical processing equipment, and more.

Overall, Stainless Steel 904L’s ability to maintain its mechanical properties, resist oxidation, and withstand thermal cycling makes it a reliable choice for applications requiring high temperature resistance and long-term durability.

Processing / Welding

Stainless Steel 904L is known for its good formability and weldability, but there are some considerations and best practices to ensure successful processing and welding:

  1. Forming and Machining
  2. Welding
  3. Heat Input
  4. Post-Weld Cleaning
  5. Equipment and Tools
  6.  Avoiding Contamination
  7.  Consultation with Experts
  8.  Testing

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