Patent ID: 7444847

Claim:
Method for hot rolling of steel or nonferrous materials with small degrees of deformation (φ) or small reductions, comprising the steps of: calculating a set rolling force (F w ) and a given adjustment position (s) by taking into account a yield point at elevated temperature (Re); and determining the yield point at elevated temperature (R e ) as a function of deformation temperature (T) and/or deformation rate (φp), which is then integrated in the function of flow stress (k f,R ) for determining the set rolling force (F w ), using the relation R e= a+e b1+b2·T ·]p c (2) by expanding a multiplicative flow curve relation by the yield point at elevated temperature (R e ) as a function of the deformation temperature (T) and deformation rate (φp) according to the formula k f,R =a+e b1+b2·T ·]p c ·k f0 ·A 1 ·e m1·T ·A 2 ·] m2 ·A 3 .]p m3 (3) in order to hot roll steel or nonferrous materials, where R e =yield point at elevated temperature T =deformation temperature φp=deformation rate a,; b i ; c=coefficients