12/14 % Manganese Steel 1

[PeterCharles]

We use 12/14% Manganese, 1.2% Carbon steel (Hadfields Manganese Steel)as wear strip material.
I seem to remember from the long past that for maximum wear resistance it should be used in a particular form.
Again I think this was "as rolled" rather than "quenched", but I can't remember.
Does anyone out there know the answer?

Regards

 

[mcguire]

The best wear resistance comes from heat treating to produce a fine dispersion of carbides in the ausenite matrix. There is no martensite formed on quenching and that formed by cold work does not enhance wear resistance.
therefore you want the as-quenched state, not the as-rolled, but you need to get the austenitizing correct to redissolve the carbon for producing the fine carbides during quench.

 

[clivejones]

This material (Hadfields Mn Steel), is a casting alloy used for wear resistant parts particularly in situations where high impact conditions are present. This is because it has the ability to workharden (the microstructure transforms to a harder phase when it is plastically deformed). In order to produce the correct microstructure it should be heat treated by heating slowly to 1050-1100 drg. C and held for 1 hour per inch of section. This is followed by a water quench to produce a fully austenitic microstructure. This structure has a moderate hardness of 220BHN with extremly dood impacture resistance 150-200 Joules on charpy "v" notch, that will work harden to 550BHN umder impact conditions.

 

[arunmrao]

Manganese steel is also available in plate sheet and strip form. It is not essentially a cast alloy.It comes in the heat treated condition and is in a ready to use condition. No subsequent heat treatment is needed. I have seen quite often this being used in shot blasting machines,though the impact is not severe to initially workharden it.