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Furnaces are equipped with PLCs and heat treatment parameters are pre-programed according to specifications. PLCs control all the heating, holding at temperature, quenching and circulating cooling system. This allows us to enhance the heat treatment by normalizing(N), annealing(A), normalizing and tempering(N+T), quenching and tempering(Q+T), and/or solution treatment(S), and ensure the fine grain size and improvement of properties  for various steel grades.