904l Stainless Steel Supply

904L stainless steel is an austenitic stainless steel that contains approximately 25% chromium, 4% molybdenum, and 1.5% nickel. It is known for its excellent corrosion resistance, high-temperature strength, and durability.

904l Stainless Steel Properties

Corrosion Resistance: 904L stainless steel is known for its excellent corrosion resistance in harsh environments, including acidic and alkaline environments. It is resistant to corrosion from chemicals, solvents, and salts, making it suitable for use in aggressive environments.

Strength: 904L stainless steel has good strength and is suitable for applications that require high levels of mechanical strength. It has a minimum tensile strength of 490 MPa and a minimum yield strength of 220 MPa.

Weldability: 904L stainless steel is known for its good weldability, making it a popular choice for welding, brazing, and soldering. It can be welded using common welding techniques, such as TIG, MIG, and stick welding.

Ductility: 904L stainless steel has good ductility, which means that it can be easily formed and shaped without cracking or breaking. This property makes it ideal for applications that require complex shapes or designs.

Magnetic Properties: 904L stainless steel is non-magnetic in all conditions.

Heat Resistance: 904L stainless steel has good heat resistance up to 400°C (752°F). It can be used in high-temperature applications such as heat exchangers and furnace parts.

Composition

The table below provides the compositional ranges of grade 904L stainless steels:

GradeCMnSiPSCrMoNiCu
904Lmin.max.-0.02-2-1-0.045-0.035192345232812

Mechanical Properties

The typical mechanical properties of grade 904L stainless steels are given in the table below:

GradeTensile Strength (MPa) minYield Strength 0.2% Proof (MPa) minElongation (% in 50mm) minHardness
Rockwell B (HR B)Brinell (HB)
904L4902203670-90 typical150

Physical Properties

The physical properties of grade 904L stainless steels are tabulated below:

GradeDensity
(kg/m3)
Elastic Modulus
(GPa)
Mean Co-eff of Thermal Expansion (µm/m/°C)Thermal Conductivity
(W/m.K)
Specific Heat 0-100°C
(J/kg.K)
Elec Resistivity
(nΩ.m)
0-100°C0-315°C0-538°CAt 20°CAt 500°C
904L790019015--11.5-500952

904l Stainless Steel Applications

904L stainless steel is a high-alloy austenitic stainless steel with excellent corrosion resistance, particularly in aggressive environments. It contains high amounts of chromium, nickel, molybdenum, and copper, providing superior performance in a wide range of applications. Here are some common applications of 904L stainless steel:

  1. Chemical and Petrochemical Processing: 904L is widely used in the chemical and petrochemical industries for equipment such as tanks, pipes, heat exchangers, and reactors. Its resistance to corrosive chemicals, including sulfuric and phosphoric acids, makes it suitable for these applications.
  2. Oil and Gas Industry: Due to its resistance to chloride stress corrosion cracking, 904L stainless steel is employed in the oil and gas industry for offshore platforms, pipelines, and equipment exposed to corrosive seawater.
  3. Flue Gas Desulfurization (FGD) Systems: 904L is used in FGD systems, where it can withstand the corrosive effects of sulfur dioxide and other acidic components in flue gases.
  4. Pharmaceutical Equipment: In the pharmaceutical industry, 904L stainless steel is chosen for the manufacturing of equipment like reactors, vessels, and piping systems due to its corrosion resistance and cleanliness.
  5. Heat Exchangers: The corrosion resistance and thermal conductivity of 904L make it suitable for use in heat exchangers, particularly in applications involving corrosive fluids.
  6. Seawater and Marine Applications: 904L stainless steel is widely used in marine environments, including seawater desalination plants, offshore structures, and shipbuilding components, thanks to its resistance to corrosion in chloride-rich conditions.
  7. Mining Equipment: Equipment used in mining operations, such as tanks, pipes, and crushers, can benefit from the corrosion resistance of 904L stainless steel when dealing with abrasive and corrosive materials.
  8. Paper and Pulp Industry: 904L is employed in the paper and pulp industry for equipment exposed to corrosive chemicals during the processing of pulp and paper.
  9. Aerospace Components: Certain aerospace applications, especially in components exposed to corrosive environments, may use 904L stainless steel for its corrosion resistance properties.
  10. Heat Treatment Equipment: 904L is suitable for use in heat treatment equipment, including furnaces and kilns, where resistance to high temperatures and corrosive atmospheres is essential.

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