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• W818938766 abstract "In this multipartner project the detrimental effects of tramp elements coming from scrap are studied. Scrap is used to produce steel e.g. in the electric arc furnace route. Cu is included there coming e.g. from automotive scrap, Sn coming e.g. from tin plate scrap. Following to the European Scrap Grading System the Cu-content in the scrap is 0.25-0.50%, the Sn-content is 0.01-0.07%. In an earlier study it was found that during continuous casting route the contents must be less than 0.2% Cu and 0.05% Sn. So the scrap there mostly cannot be used directly. The detrimental effects of tramp elements Cu and Sn depend on metallurgical processes such as diffusion and oxidation. So it has to be expected, that the tolerable limits depend on the temperature-time-histories during production. New near net shape casting technique such as twin roll casting (2-4 mm thickness) or DSC-casting (10-15 mm thickness) include a much quicker cooling than given in a continuously cast slab (≈ 25 cm thick). Special feature of near net shape casting is furthermore the aspect of inline hot rolling. It should be mentioned that concerning the productivity the techniques of near net shape casting and the electric arc furnace route will fit together excellently. The aim of this project was to investigate the tolerable limits of Cu and Sn from scrap, if the casting process is one of the.new near net shape casting techniques. A further goal was to investigate the development of new steels, where Cu is added intentionally in larger amounts; improved corrosion resistance and mechanical properties are expected therefrom. The distribution of tasks was planned and really carried out as follows: Swedish Institute for Metals Research (SIMR) contributed expertise regarding laboratory-scale simulation using hot compression equipment and evaluation of microstructures and mechanical properties for both laboratory and pilot plant materials. Conditions for avoiding hot shortness are identified as well as ways of increasing the strength of the products by utilising Cu as an alloying element. The laboratory simulations provided guide-lines for the larger scale pilot plant trials. Metallographic studies as well as texture measurements were carried out. Salzgitter-Mannesmann-Forschung (SZMF) together with subcontractor Technical University Clausthal (TUC) performed trials with the DSC simulator to achieve a rapid scan through the relevant process parameter ranges in order to determine those which are suitable regarding material properties. Based on this work and on the results of the project partners DSC pilot plant trials were performed for selected grades and process parameters. Both materials from the simulator and from pilot plant trials were investigated; mechanical and technical properties were studied. Max-Planck-Institut fur Eisenforschung (MPI) has equipment and experience in strip casting by the twin roll technique for strip thicknesses in the range of 1-5 mm. Hot rolling in-line is possible, as also is heat treatment using an in-line furnace. The casting process is well understood so that process modifications could be made as dictated by the demands of product properties. Hot and cold rolling could be carried out as additional stages of product treatment. The rollability was itself a product property to be investigated. Model calculations for hot shortness, metallography, mechanical investigations and texture measurements were carried out. MPI also undertook the coordination. The investigation was concentrated at a low carbon steel DC 04; this is produced in large amounts, especially used for deep drawing, and it is very sensitive to tramp elements. The tramp element additions were 0-2.5% Cu and 0-0.15% Sn." @default.
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• W818938766 date "2006-01-01" @default.
• W818938766 modified "2023-09-27" @default.
• W818938766 title "Improving of the properties of near net shape cast strip containing copper and tin from scrap" @default.
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