Automatic control of rolled steel prod. structure - by controlling travel speed through cooling zone

摘要

The process involves (i) determining the value (aim value) of the mean temp. of transformation corresponding to the structure desired in the prod.; (ii) determining, before entry of the prod. into the cooling zone and as a function of the geometrical and thermal characteristics of the leading portion of the prod., the values of the cooling conditions and the initial speed of prod. travel leading to the aim value in the leading portion of the prod; (iii) applying these values during cooling of the leading portion of the prod.; (iv) determining the effective value of the mean transformation temp. in at least one downstream section of the prod.; (v) comparing this effective value with the aim value; and (vi) modifying the speed of travel of the prod. to reduce or pref. eliminate the difference between the values. The process is used esp. for automatic control of the structure of rolled steel wire, rod or flat prods., for strip temp. control before coiling and self tempering temp. control in the quenching and self-tempering process.