Same composition, same hardness nut not the same machning !!!
Same composition, same hardness nut not the same machning !!!
(OP)
We two parts produced in steel casting wich have the same composition (GS20Mn6) and the same hardness, but one part can be machning and the other one can'not be maching !!
I don't kno why ?
Any help ?
Stan
I don't kno why ?
Any help ?
Stan





RE: Same composition, same hardness nut not the same machning !!!
Rao Yallapragada
RE: Same composition, same hardness nut not the same machning !!!
Please provide more details of the castings and the chemistry too alonwith heat treatment cycles.
RE: Same composition, same hardness nut not the same machning !!!
1- For this time i have only the hardness of the part
229 à 241 HB for 204/242
2- I haver not yet investigate the microstructure !
3- Heat treatment is QT
4- There is 20 parts which can not be machniing all the part are OK ! These 20 parts are in the same pourring reference.
Thanks again
RE: Same composition, same hardness nut not the same machning !!!
RE: Same composition, same hardness nut not the same machning !!!
Thanks arunmrao !