Posts Tagged ‘alloy C276’
Why is alloy c276 (equivalent to Hastelloy C276) produced by stainless steel manufacturing companies? What does it have that other alloys do not? How complex is the process of making such material? Let us look into the intricacies of producing alloy c276 (equivalent to Hastelloy C276).
This type of alloy is one of the most corrosion-resistant materials all over the world. It can be used for different applications like chemical processing and petrochemical processing, industrial waste, flue gas desulfurization and pulp and paper equipment.
What is it exactly? It is a nickel-molybdenum-chromium-iron-tungsten alloy. The molybdenum content is responsible for the resistance to corrosion. The low carbon content minimizes the carbide precipitation when the alloy is being welded on. It has high temperature strength with oxidation resistance. This type of alloy has been around for several years.
This alloy is fabricated by welding just like those techniques used in stainless steel and nickel-based alloy products. It is also formed like how stainless steel is formed although the material is stronger than the conventional austenitic stainless steel. In cold working, the material will harden faster than austenitic stainless steels. The high strength and rapid hardening requires the need for intermediate anneals to help form the alloy.
Its welding characteristics are similar to austenitic stainless steel as well. For welding techniques, it is best to go with techniques that minimize degradation of the corrosion-resistance property of the alloy. Methods like gas tungsten arc welding, gas metal arc or resistance welding will do minimal damage to the corrosion resistance of the heated and welded part.
To obtain the corrosion resistance of this alloy, a clean surface is needed. Descaling is more difficult because of the alloy content. It will be helpful to descale the alloy using stainless wire brushing or grit blasting. It can be followed by an immersion in nitric and hydrofluoric acids then a water rinse afterwards.