Have you ever heard of the alloy Tribaloy 800? It’s a cobalt-based alloy produced for industrial use since the 1970s. This alloy is known for being extremely strong and durable, making it ideal for a wide range of applications. In this blog post, we’ll dive into the composition and properties of Tribaloy 800, as well as its uses, heat treatment, welding, and corrosion-resistant properties.
Tribaloy 800 Composition
Tribaloy 800 is a cobalt-based alloy containing significant amounts of chromium, tungsten, and nickel. The specific composition is as follows: 39% Co, 48% Cr, 11.5% W, and 1.4% Ni. It also contains small amounts of carbon, manganese, and silicon. The high percentages of chromium, tungsten, and cobalt make the alloy resistant to wear and corrosion.
Tribaloy 800 Physical Properties
Tribaloy 800 has a density of 8.55 g/cm3, which is quite high compared to other metals. It also has a melting point of 1315°C (2399°F) and a boiling point of 2900°C (5250°F). The alloy is known for its high strength and toughness, even at elevated temperatures. This makes it ideal for use in hot, corrosive environments where other materials would fail.
Tribaloy 800 Mechanical Properties
Tribaloy 800 has a very high hardness, with a typical range of Rockwell C60 to 64. It is ideal for wear-resistant applications like cutting tools, bearings, and valve components. The alloy also has excellent tensile strength and fatigue resistance, making it suitable for high-stress applications like turbine blades and compressor discs.
Tribaloy 800 Uses
Tribaloy 800 has various industrial uses, ranging from aerospace components to industrial valves. It is commonly used in applications requiring high wear and corrosion resistance. Specifically, it is used in hot gas corrosion environments like gas turbine engines and high-pressure hydraulic systems. Other uses include valve trim, extrusion dies, furnace components, and bearings.
Tribaloy 800 Heat Treatment
Tribaloy 800 can be heat-treated to improve its mechanical properties. The recommended heat treatment for Tribaloy 800 is a double annealing process followed by stress-relieving heat treatment. This process helps to eliminate any residual stresses in the alloy and improve its toughness and fatigue strength.
Tribaloy 800 Welding
Tribaloy 800 can be welded using various methods, including gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW). However, the alloy is prone to cracking during welding, especially if it needs to be properly preheated and post-weld heat-treated. Welding should be performed with a low heat input, and the alloy should be cooled slowly after welding.
Tribaloy 800 Corrosion Resistant
Tribaloy 800 is highly corrosion-resistant, especially in hot, acidic environments. It is also resistant to oxidation and sulfidation. However, the alloy may experience localized corrosion in certain environments, such as seawater or acidic chloride solutions. A protective coating or plating may be needed to prevent corrosion in these cases.
Tribaloy 800 is a valuable and versatile cobalt-based alloy that has proven incredibly strong, durable, and resistant to wear and corrosion. Its chemical composition and physical properties are ideal for high-stress industrial applications such as gas turbine engines, oil well drilling, and chemical processing. However, it should be noted that Tribaloy 800 requires proper heat treatment and welding procedures to guarantee its longevity and performance.
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