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(Tempering and Quenching Salt for High Speed Steels)
Melting Point 495°C (920°F.)
Our above product is a granular mixture of neutral chloride salts in white colour. Its low melting point and wide working range make it suitable for many heat treatment operations of steel. These include preheating for hardening sub-critical annealing, high temperature drawing and hot quenching of high alloy tool steels. It is specially suitable as a hardening and tempering medium when parts are oil quenched, and then drawn at relatively high temperature since no intermediate washing is required. This salt is less hydroscopic-than ASHTEMP-430 neutral salt. Parts should be washed soon after the treatment. An agitated hot water wash is suitable medium. Wash water should be changed frequently so as to minimize concentration of dissolved salts. Thereafter parts should be provided with Anti Rust Protection either by using straight water. Displacible Rust Preventives of ASFOSIL type or water, soluble type Rust Protectives for short term.
If the bath is operated above 760°C, ASHTREAT ADDITIVE should be used as floating layer which eliminate the need for rectification of bath.
Above salt has a specific heat of 0.27. Above salt can be used in all types of salt bath furnaces. But submerged electrode furnaces with ceramic lined pots are the ideal equipment.