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AssigneesKeramchemie GmbH, BWG Bergwerk- und Walzwerk-Maschinenbau GmbH
InventorsHeinz Berger, Rolf Noe, Frank Barhold, Jorg Neumann, Andreas Noe, Ralf Waldmann, Bodo Block
Estimating the term…
A method of producing a cold-rolled strip from a stainless, ferretic or austenitic high-grade steel or a titanium alloy, wherein the strip which has been wound into a coil and has been manufactured by a hot-rolling or casting process is subjected in one pass to the steps of unwinding the coil, mechanically descaling the strip if required, subsequently chemically and/or electrochemically first or black pickling of the strip, then cold-rolling the strip to finished dimensions, degreasing the strip as required, annealing the strip, finish-pickling the strip and, if necessary, passivating, dressing and stretcher-leveling the strip. The pickling step is carried out in a pickling solution which contains hydrochloric acid, sulfuric acid and/or nitric acid.
In a method of producing a cold-rolled strip of a stainless austenitic high-grade steel or a titanium alloy, the method including carrying out in one pass the steps of unwinding a coil produced by a hot-rolling or casting procedure and wound into a coil, subsequently subjecting the strip to a chemical and/or electrochemical first pickling step, and then cold-rolling the strip to finished dimensions, and annealing and finish-pickling the strip, the improvement comprising carrying out the first pickling step with a pickling solution containing at least one of hydrochloric acid, sulfuric acid and hydrofluoric acid.
Dependencies are inferred from the claim text.