Determining Hardenability of Steel - ASTM A255

[PCS30]

The calculation method (hardenability) described in the ASTM A255 is applicable only to a range of chemical composition. Nickel max is 1,50. It is not applicable for 4340. Someone knows how can I calculate hardenability for this steel (4340)?

 

[CoryPad]

thread330-366454

thread330-288119

thread330-238962

 

[PCS30]

I am trying use Prediction of Microstructure and Hardness in Low-Alloy Steel : The tool calculates the fractions of different ferrite morphology that forms from the austenite and relates the same to Vickers hardness

http://calculations.ewi.org/vjp/MaterialsModeling.html

but which cooling rate is more adequate (quench in polymer)?

 

[TVP]

Is this for a weldment? Or is this to predict the hardness after quenching in oil/water/water+polymer/etc. You can use the ASTM A255 method to estimate the hardenability of 4340, which will likely be more accurate than the EWI method.