Stellite 20 is a highly versatile and popular alloy known for its excellent Resistance to wear, corrosion and high temperatures. The Material is mainly used for its superb hardness, toughness and functional properties in demanding applications across various industries. This alloy has become a go-to option from aerospace to medical, automotive to petrochemical because of its exceptional attributes. In this blog post, we will dive deeper into the composition, physical and mechanical properties, uses, hardness, heat treatment, welding and corrosion resistance of Stellite 20.

Stellite 20 Composition

Stellite 20 is a cobalt-chromium-tungsten alloy that is designed specifically for use in extreme wear environments. It typically consists of 30% cobalt, 12% tungsten, 1.2% chromium, 1.2% carbon, and 0.5% silicon. Other elements, such as molybdenum, iron, nickel and manganese, may also be present in small amounts.

Stellite 20 Physical Properties

Stellite 20 has a melting point of around 1330°C and a density of approximately 8.5 g/cm3. The alloy exhibits good thermal conductivity, low thermal expansion, high electrical resistivity, and excellent resistance to corrosion in aggressive environments.

Stellite 20 Mechanical Properties

The mechanical properties of Stellite 20 make it ideal for use in high-wear applications such as cutting tools, valve seats, and pump components. It has a tensile strength of around 1000 MPa, yield strength of about 600 MPa, and an elongation of 5%. The alloy displays good toughness at low and high temperatures and is highly resistant to fatigue, galling, and erosion.

Stellite 20 Uses

Stellite 20 is a reliable and cost-effective choice for various industrial applications. It is used extensively in producing cutting tools, saw blades, valve parts, bearings, and pump components. Additionally, it is commonly employed in chemical and petrochemical processing and power generation.

Stellite 20 Hardness

Stellite 20 is renowned for its extreme hardness, which makes it suitable for use in severe wear environments where other materials struggle to operate efficiently. The material can achieve a maximum hardness of around 60 HRC, considerably higher than most steels.

Stellite 20 Heat Treatment 

Stellite 20 exhibits good stability at high temperatures, making it amenable to heat treatment. Heat treatment can help to increase the hardness and wear resistance of the material, improve its machinability and reduce the risk of cracking during fabrication.

Stellite 20 Welding 

Stellite 20 can be welded using various methods such as TIG, MIG, and plasma welding processes. However, welding requires additional care and attention to avoid cracks and other defects in the material during fabrication. Using filler materials with a similar composition to Stellite 20 can reduce the potential for cracking.

Stellite 20 Corrosion Resistant

Stellite 20 exhibits remarkable resistance to corrosion in highly corrosive environments, making it an ideal choice for a wide range of industrial applications. The alloy’s excellent resistance to various acids, alkalis, salts, and seawater makes it a top-performing material in harsh applications.

Conclusion

Stellite 20 is a special alloy with unique properties, making it an optimal choice for various industrial applications. Its exceptional hardness, toughness, and corrosion resistance make it the material of choice in challenging and harsh environments. Stellite 20 is easily worked, fabricated and can be heat-treated into different shapes and sizes, finding its way into diverse industries such as aerospace, medical, automotive, petrochemical, power generation and more. As technology advances and industries evolve, Stellite 20 will continue to play an essential role in providing practical solutions to challenges that require high wear resistance and functional performance.

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