Heat treatment of Inconel 600 pipe is an important process to improve its corrosion resistance and mechanical properties. The main heat treatment processes include solution treatment, precipitation hardening, and stress relief.
Solution treatment: heat Inconel 600 pipe to a temperature of about 1093-1150°C, and the holding time is generally 1-4 hours to make it reach a solid solution state. At this temperature, carbides and other insoluble residues of Inconel 600 dissolve, allowing its grains to grow and penetrate the grain boundary polygons.
Cooling: Rapid cooling to room temperature is required after solution treatment. Rapid cooling can enhance the toughness of the UNS N06600 pipe and avoid the re-formation of carbides in the pipe.
Precipitation hardening: heat the nickel alloy 600 pipe after solid solution treatment at 750°C for 10-20 hours to form small spherical particles (γ") and cubic particles (γ'). These particles will increase the hardness and strength of the Inconel 600 pipe.
Stress relief: In order to reduce the stress generated by the pipe fittings during forming and processing, stress relief must be carried out. This is achieved by heating the UNS N06600 pipe to around 480°C for a holding time of 1-2 hours and then slowly cooling to room temperature.
