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Change Flow Curve / Plasticity Curve of nodes with different cooling time

I managed to develop an algorithm using subroutine PLOTV to calculate and display the T8/5 (cooling time between 800degC - 500degC) of nodes due to welding process.
 
Now, I want to insert new property for nodes with different T8/5 time range (ex. for T8/5 of 0-5 sec, T8/5 of 5-10 sec etc etc). The new property of nodes is Flow/plasticity Curve with certain strain rate at 20deg C. The idea is, after this cooling period (at 20degC), I want to impose tensile test, so I have different strain for all node.
 
Which subroutine should I use?
 
Thank you
 
Thank you.