i want to now how much torque required for make a m24x3mm pitch in a cnc turning lathe machine with a live tool (unit in Nm) material high alloy steel 255HB

The amount of cutting force is directly proportional to the depth of cut, radial engagement, material machinability, etc..

This is pretty common knowledge but it also answers the question with a resounding.... It depends on the depth of cut.

Low power machines: lighter radial/axial depths, more passes, possibly at a higher feedrate

Higher power machines: heavier radial/axial depths, fewer passes, lower feedrates

Surely, you do not propose to cut the thread in one go?????