Method for the production of a siderurgical product made of carbon steel with a high copper content, and siderurgical product obtained according to said method

Abstract

The present invention relates to a method for the manufacture of ferrometallurgical products made of carbon steel with a high copper content, according to which method: - manufacture of liquid steel with the following composition: 0.0005% ≤ C ≤ 1%; 0.5 ≤ Cu ≤ 10%; 0≤Mn≤2%; 0≤Si≤5%; 0≤Ti≤0.5%; 0≤Nb≤0.5%; 0≤Ni≤5%; impurities; - direct casting of said liquid steel into the shape of a thin steel strip with a thickness not greater than 10 mm; - forced cooling of the steel strip and/or surrounding the steel strip with a non-oxidizing atmosphere with a temperature higher than 1000 °C; - at least hot rolling of the thin strip at a reduction of 10%, at the end of the rolling process at a temperature at which all the copper is still in solid solution in the ferrite and/or austenite matrix; - forcing the strip cooling in order to keep the copper in supersaturated solid solution in the ferritic and/or austenitic matrix; and coiling the strip. The invention also relates to a ferrous metallurgical article obtained according to said method.

Description

technical field [0001] The present invention relates to the field of manufacture of iron-based alloys, more particularly of steel with a high copper content. Background technique [0002] In carbon steels, copper is generally considered an undesirable element, because on the one hand it promotes the formation of cracks when heated, complicating the hot working of steel, and on the other hand it adversely affects the quality of the product and surface appearance. For these reasons, the copper content of high-quality carbon steels is usually limited to less than 0.05%. Since the copper present in the liquid steel cannot be removed, this low copper content can only be reliably achieved by making steel from liquid cast iron, and this is only done on a large scale or when carefully refined by smelting in an electric arc furnace. It is only economically feasible to make iron and steel from selected and thus expensive iron and steel shavings. [0003] However, in some cases it i...

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