PROCESS FOR MONITORING AND CONTROLLING THE QUALITY OF ROLLED PRODUCTS FROM HOT-ROLLED PROCESSES

摘要

This invention concerns a process to monitor and control the quality of rolled products from hot-rolled processes which produce products such as sheets, rods, etc., from input stock such as slabs, billets, etc. The aim of the invention is to estimate in advance the expected material properties of the end product at each step of the hot-rolling production process. This is achieved in that production conditions such as temperatures (t), reduction in depth (ζ), etc., are detected on-line throughout the entire rolling process and from the values obtained, by means of interrelated physical-metallurgical and/or statistical models (1, 2, 3, M) describing the whole rolling process, the mechanical/technical material properties to be expected, particularly the yield point (Rp0.2), the tensile strength (Rm) and the breaking elongation point (Ax) of the rolled product, are calculated. On-line detection of the actual and momentary production conditions is necessary to allow the material properties to always be estimated in advance.