Hardenability factor J50  
74,175*C0,5+16*Mn+5*Si+19*Cr+6,3*Ni+35*Mo-0,82*Grano Austenitico-47,93

The hardenability factor J50 is useful to know the real possibility to obtain a good hardening deepness on quenching & tempering steels.. The more the resulting value approaches to 50, the more the chemical composition and the austenitic grain size will ease the hardening deepnesss.
C %  
Mn %  
Si %  
Cr %  
Ni %  
Mo %      
Grano Austenitico          
J50