During rolling defects are formed in the final product if the process is not property controlled. Typical defects include seams, fins, segregations, banding, inclusions etc. These defects lead to failures such as internal and external cracks when the pan is old forged. Rolling thus has a great effect on the forgeability of the rods and bars. The aim is to make the pans highly forgeable by reducing defects by controlling the hot rolling process. M integrated system (ROLPAS) for performing off-line computer analysis of the roll pass sequences was developed to model metal flow, microstructural evolution and phase transformation during hot rolling. Various structure-property relationships allow prediction of properties in the final product Currently, the transformation modeling can be used only for hypo-eutectoid steels. Other steels are being added into the system. A computer-aided system for roll pass design and evaluation, ROBROLL, is briefly described. These systems offer an inexpensive and powerful alternative to the traditional trial and error approach in roll pass c-fl. For example ROLPAS can be used tome sure the nominal value of the rolled product is - while ROBROLL used to reduce the variation in the rolled product to be negligible.
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