Method for manufacturing copper-bearing container steel plate casting blank through precise measuring of copper content in nickel-copper alloy

Abstract

The invention provides a method for manufacturing a copper-bearing container steel plate casting blank through precise measuring of the copper content in a nickel-copper alloy. The above method for producing a copper-bearing container steel plate comprises the steps of molten iron pretreatment, converter smelting and LF furnace refinement. The step of converter smelting comprises the substeps thatthe copper content in the nickel-copper alloy is firstly measured, and then the nickel-copper alloy is added. In LF furnace refinement, inclusion modification calcium treatment is needed, and the standing time is larger than or equal to 7 min after refinement is finished. The substep of measuring the copper content in the nickel-copper alloy comprises the substeps that interference separation iscarried out, the copper content in filter liquor is measured, supplementary and correction of precipitation adsorption are carried out, and the measured copper content in the filter liquor and the copper content measured through supplementary and correction of precipitation adsorption are added; according to interference separation, iron interference elements are separated through ammonium hydroxide; and the copper content in test liquid is measured through the ICP spectrum to achieve supplementary and correction. The surface quality of the manufactured casting blank is good, and no crack is found during acid pickling of corners.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing copper-containing container steel plates, in particular to a method for producing copper-containing container steel plate slabs by using accurate measurement of copper content in nickel-copper alloys. Background technique [0002] Nickel and copper are the main alloying elements in steelmaking, and are widely used as alloying agents for weathering steel, structural steel, stainless steel and other steel types. Copper plays the role of active cathode in steel, which can promote the anode passivation of steel under certain conditions, thereby reducing the corrosion rate of steel. The enrichment of Cu in the rust layer can also improve the protective performance of the rust layer and become a protective film that prevents rust from further deepening, thereby improving the corrosion resistance of steel. This ability of copper is widely used in w...

AI Technical Summary

Problems solved by technology

However, at present, the control of copper content in container steel is unstable, either failing to meet the requirements of corrosion resistance, or failing to ensure good surface quality

[0006] In the process of realizing the present invention, the applicant found that there are at least the following problems in the prior art: the existing container steel plates can well meet the requirements of corrosion resistance and surface quality

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