Does case hardened shafts heated for Straightening loses hardenablity? -

16MnCr5 shafts bends when case hardened to 760HV10 Any ways to avoid bends????

16MnCr5 is a case hardening steel. If case hardness is 60HRC , then also core hardness is appx 40 HRC and at this hardness , a little bent shaft can easily be streightened at room temp. with the help of hydrolic press. If its naccessory to heat it , up to 180 Degree celcius hardness may fall max 2 HRC