ASM Online Member Community

To all:

Im new to the field and am interested into some insight of DI vlaues as they pertain to heat treatment. I am learning as I go but many have aided me with valuable knowledge so far. We do not have a metallurgist anymore so I have tried to step up as a career path change from industrial electrician with induction heating experieence. My question is we are always in caution of a higher DI as it makes our product harder to mahcine prior to heat trearment via induction. I have searched to see what concerns may be if our Di value is lower. Not that it puts us out of spec or tolerance but Im just curious as to its possibility of concern.

Hi Rodney,

The DI is hardenability (how hard the part gets after heat-treating) of the steel after heat treatment. It prevents sag in the manufactured components Higher the DI lower the sag after putting it in the service. I am in coil spring and other suspension components manufacturing business where sag is not desired.

Thanks,

To all:

Im new to the field and am interested into some insight of DI vlaues as they pertain to heat treatment. I am learning as I go but many have aided me with valuable knowledge so far. We do not have a metallurgist anymore so I have tried to step up as a career path change from industrial electrician with induction heating experieence. My question is we are always in caution of a higher DI as it makes our product harder to mahcine prior to heat trearment via induction. I have searched to see what concerns may be if our Di value is lower. Not that it puts us out of spec or tolerance but Im just curious as to its possibility of concern.

Sanjay,

Thanks for your feedback! We are in the S cam brake shoe business. We usually have to worry on the high end of our spec for DI but I was never in a situation with a lower DI value. It is on bar steel with a diameter range from 1 1/2" to a touch under 2 ". It has been truly a learning curve here for myself. I'm sure you will see more questions posted as I venture further into my career here.

Hi Rodney,

The DI is hardenability (how hard the part gets after heat-treating) of the steel after heat treatment. It prevents sag in the manufactured components Higher the DI lower the sag after putting it in the service. I am in coil spring and other suspension components manufacturing business where sag is not desired.

Thanks,

To all:

Im new to the field and am interested into some insight of DI vlaues as they pertain to heat treatment. I am learning as I go but many have aided me with valuable knowledge so far. We do not have a metallurgist anymore so I have tried to step up as a career path change from industrial electrician with induction heating experieence. My question is we are always in caution of a higher DI as it makes our product harder to mahcine prior to heat trearment via induction. I have searched to see what concerns may be if our Di value is lower. Not that it puts us out of spec or tolerance but Im just curious as to its possibility of concern.