Stainless Steel 321H 1.4878

Stainless Steel 321H (1.4878) is a popular variant of stainless steel renowned for its exceptional resistance to high temperatures and corrosive environments. With a composition tailored to enhance its properties, this alloy finds widespread use across various industries. Understanding its characteristics, composition, and applications is crucial for engineers, manufacturers, and users alike.

Stainless Steel 321H 1.4878

Composition and Characteristics

Stainless Steel 321H (1.4878) is an austenitic stainless steel alloy with a high carbon content, designed for elevated temperature applications. Its composition typically includes:

  • Chromium (Cr): Provides resistance to corrosion and oxidation, forming a passive oxide layer on the surface.
  • Nickel (Ni): Enhances toughness and ductility, even at high temperatures.
  • Titanium (Ti): Stabilizes the alloy against sensitization and intergranular corrosion.
  • Carbon (C): Increases high-temperature strength and hardness.

The key characteristics of Stainless Steel 321H (1.4878) include

  1. High Temperature Resistance: The alloy retains its mechanical properties at elevated temperatures, making it suitable for applications in heat exchangers, furnace components, and exhaust systems.

  2. Corrosion Resistance: With its chromium content, Stainless Steel 321H exhibits excellent resistance to corrosion in acidic and chloride environments, making it suitable for chemical processing industries.

  3. Oxidation Resistance: The alloy forms a protective oxide layer when exposed to high temperatures, providing resistance to oxidation and scaling.

  4. Weldability: Stainless Steel 321H offers good weldability and formability, allowing for ease of fabrication and construction in various applications.

Applications of Stainless Steel 321H (1.4878)

Stainless Steel 321H (1.4878) finds widespread use across several industries, including:

  • Chemical and Petrochemical: Pressure vessels, piping systems, and reactors where resistance to corrosive environments and high temperatures is essential.
  • Aerospace: Exhaust systems, aircraft components, and engine parts requiring elevated temperature strength and corrosion resistance.
  • Food Processing: Equipment and machinery for the production and handling of acidic food products, where hygiene and corrosion resistance are critical.
  • Automotive: Exhaust manifolds, catalytic converters, and other components exposed to high temperatures and corrosive gases.
  • Power Generation: Boiler tubes, heat exchangers, and turbine components operating at elevated temperatures and pressures.

Comparison of Stainless Steel Grades

PropertyStainless Steel 321H (1.4878)Stainless Steel 304 (1.4301)Stainless Steel 316 (1.4401)
Temperature Range870°C - 925°C (1600°F - 1700°F)870°C - 925°C (1600°F - 1700°F)870°C - 925°C (1600°F - 1700°F)
Chromium Content17.0% - 19.0%18.0% - 20.0%16.0% - 18.0%
Nickel Content9.0% - 12.0%8.0% - 10.5%10.0% - 14.0%
Carbon Content0.04% - 0.10%0.07%0.08%
ApplicationHigh temperature, corrosive environmentsGeneral purpose, corrosion resistanceImproved corrosion resistance

Stainless Steel 321H (1.4878) stands out as a versatile and reliable alloy, offering exceptional resistance to high temperatures and corrosive environments. Its composition, characterized by high chromium, nickel, and carbon content, makes it suitable for a wide range of applications across various industries. Engineers and manufacturers seeking materials capable of withstanding demanding conditions can rely on Stainless Steel 321H (1.4878) for superior performance and durability.


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