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Stainless Steel - Grade 446/1.4828

Description

Stainless Steel Grade 446/1.4828 is a high-chromium ferritic stainless steel known for its excellent resistance to oxidation and high-temperature environments. It is commonly used in applications requiring resistance to severe oxidation, such as in combustion environments and high-temperature applications. Its high chromium content provides superior resistance to oxidation and corrosion, making it suitable for use in extreme conditions.

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Chemical Composition

  • Carbon (C): ≤ 0.20%
  • Chromium (Cr): 23.0 - 27.0%
  • Nickel(ni)≤ 0.75%
  • Manganese (Mn): ≤ 1.00%
  • Silicon (Si): 1.0 - 1.5%
  • Sulfur (S): ≤ 0.030%
  • Phosphorus (P): ≤ 0.040%
  • Nitrogen(N): ≤ 0.25%

Mechanical Properties

  • Tensile Strength: 310 MPa (45,000 psi)
  • Yield Strength: 175 MPa (25,000 psi)
  • Elongation: 25% (in 50 mm)
  • Hardness (Brinell): 220 HB (Brinell Hardness)
  • Impact Toughness: Moderate impact resistance

Thermal & Physical Properties

  • Density: 7.8 g/cm³
  • Melting Point: Approximately 1450°C (2642°F)
  • Thermal Conductivity: 25 W/m•K (at 100°C)
  • Thermal Expansion: 10.4 x 10⁻⁶ /K (0°C to 100°C)
  • Specific Heat Capacity:460 J/kg•K

Other Designations

  • DIN : X20Cr25
  • UNS:S44600
  • JIS: SUS 446
  • DIN: 1.4828

Fabrication and Heat Treatment

  • Machining: Machinability is lower compared to austenitic stainless steels. Carbide tools are recommended for machining.
  • Welding: Generally weldable using conventional techniques; however, pre-heating and post-weld heat treatments may be required to avoid sensitization and to improve toughness.
  • Heat Treatment: Annealing can be performed at temperatures between 1050°C and 1150°C (1922°F and 2102°F) to relieve stresses and improve mechanical properties. Avoid rapid cooling after heat treatment to prevent embrittlement.

Applications

  • Industrial Furnaces : Components exposed to high temperatures and corrosive environments.
  • Combustion Chambers: Parts subjected to severe oxidation and high-temperature environments.
  • Heat Exchangers: For use in harsh chemical environments.
  • Exhaust Systems: Parts in high-temperature exhaust systems in various industries.
  • Gas Turbines: Components in turbines that operate under high temperatures.

Supplied Forms

  • Bars
  • Wars

Features

  • High-Oxidation Resistance: Excellent resistance to oxidation in high-temperature environments.
  • Good Corrosion Resistance: Superior resistance to corrosion compared to many other ferritic stainless steels.
  • Thermal Stability: Maintains its properties at elevated temperatures, making it suitable for high-heat applications.
  • High Chromium Content: Provides improved resistance to scaling and high-temperature oxidation.
  • Durability: Provides long-term durability in severe environments.