EMPIRICAL MODELS OF COLD WORKING EFFECT IN STEEL TUBE PRODUCTION

摘要

Carbon steel is purchased in coils, slit to width, and fed into electrical resistance welding mills that convert it into round, square, or rectangular structural tubing. The objective of this project was to establish relationships between certain properties (yield, tensile, elongation) of the tube after cold working and those of the flat coil before cold working, and build empirical predictive models from a data base of before-and-after properties provided to us by a tube manufacturer. Using multiple regression analysis, a set of three regression models was built with tube geometry and flat steel properties as the independent variables, and tube physical properties as the dependent variables. These regression models can be used by the manufacturer for both prediction of results when coil properties are known, and the computation of ideal coil steel specifications. We provide a sample solution of the latter "inverse problem" using the three equations and Excel Solver.