Standard

SAE AMS2821A

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Examples of specific uses of the salts covered by this specification are as follows: Class 1 Bluing and tempering of steels, quenching of carbon and low-alloy steels for martempering and austempering, annealing and stress relieving of cold-worked copper and brasses.  Class 2 Primarily designed for the heat treatment of aluminum alloys but can be used for the annealing of copper and brasses and tempering of steel.  Class 3 High-temperature draw of low-carbon alloy steels, process anneal of low-carbon steel, brazing with silver solder, and process anneal of stainless steels.  Class 4 Wide temperature range hardening, annealing, and high-temperature quenching for medium- to high-carbon alloy and carbon steels, reheat of carburized steels, and preheating of tool steels.  NOTE: Not desirable for use in austempering or martempering with salt quench.  Class 4A Hot quenching and tempering of high-speed steel.  Class 5 General heat-treating purposes, normalizing, annealing, hardening of certain carbon and alloy steels, brazing of all silver solders, preheating of high-speed steels, and preparation of steels for isothermal processes.  Class 6 Annealing of stainless steel and hardening of high-carbon chromium tool steels.  Class 7 Hardening of high-speed steels and in the heat treatment of certain high-alloy steels.  Class 8 Hardening of high-speed steel as well as the high-carbon, high-chromium tool steels. This salt is desirable where only one furnace is available for heat treating both the above mentioned steels. Class 8 is intended for intermittent operation. For continuous operation at the upper end of the high-speed steel hardening range, use Class 7.

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