life of the Nemag Rope Pear Socket cast out of high alloy austenitic
maganese steel is often greatly in excess of that of the wire rope.
Austenitic steel unites a great toughness and a high resistance
to wear. However, by a wrong heat treatment, the austenite may be
converted into martensite, which is brittle and not resistant to
the shocks to which Rope Pear Sockets are exposed. When casting
wire ropes into or out of Rope Pear Sockets, the instructions given
below have to be closely followed.
of austenite into martensite occurs when heating Rope Pear Sockets
to temperatures upwards of 300-400 deg.C, the more rapidly according
to the higher temperature ranges. Therefore the use of casting alloys
having a melting-point upwards of 245 deg.C and a casting temperature
upwards of 320-350 deg.C is not permissible. When preheating a Rope
Pear Socket before casting it to or loosening it from the wire rope,
it has to done uniformly. Take care that the temperature nowhere
exceeds 350 deg.C and check this by "Thermochrom" pins
or possibly by thermocouples.