ANN	Artificial neural network
ML	Machine learning
BP	Backpropagation
MSE	Mean square error
I	Experimental data or input data
Imax	The maximum value in experimental data
Imin	The maximum value in experimental data
I’	The unified value corresponding to Y
BP	Backpropagation algorithm
R	Correlation coefficient
RMSE	Root mean square error
AARE	Average actual relative error
Ei,	Experimental values
Pi	Predicted values
$\overline{E}$	Average of the experimental values
$\overline{P}$	Average of the predicted values
N	Number of the casted alloys
σu	Ultimate tensile strength
HB	Brinell hardness
δ	Elongation to failure