AMPL's show_stats listing
ampl: option show_stats 1;

ampl: model steelpl5.mod;
ampl: data steelpl5.dat;

ampl: solve;

Presolve eliminates 2 constraints and 2 variables.
12 piecewise-linear terms replaced by 24 variables and 12 constraints.
Adjusted problem:
52 variables, all linear
24 constraints, all linear; 78 nonzeros
1 linear objective; 36 nonzeros.

MINOS 5.4: optimal solution found.
27 iterations, objective 707991

ampl: