Cyaniding
In cyaniding a case of high hardness and wear resistance is produced on C-alloy steels. Work is immersed in molten salt bath containing NaCN which is heated to 820 – 860°C. this is usually followed by water quenching. This cyanide bath consist of 20-30%.
The time required is 30 -90 min depending upon the depth of case which is 0.15 – 0.5 mm.
The atomic C diffuses into steel, the work can be directly quenched as soon as it taken out of the bath, and then low-temperature tempering is done at 200°C.
It should be noted that hardness varies in following sequences :
Nitriding > Cyaniding > Carburizing
Cyaniding is used to produce light cases on small shafts, worms, nuts, springs, pins, etc.
Advantage :
- Resistance to corrosion and wear is high.
Disadvantages :
- High cost.
- Cyaniding bath is toxic hence the worker needs protection.
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