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Method for producing copper-containing container steel plates using accurate determination of copper content in nickel-copper alloys

A technology of nickel-copper alloy and copper content, which is applied in the direction of chemical analysis by titration method, analysis by making materials undergo chemical reactions, and material analysis by observing the influence of chemical indicators, etc., which can solve the problems of surface quality, Can not achieve corrosion resistance and other problems, to achieve the effect of improving the quality of steelmaking billet and final rolling product quality, good precision, and avoiding fluctuations in copper content

Active Publication Date: 2021-12-10
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method for producing copper-containing container steel plates using accurate determination of copper content in nickel-copper alloys
  • Method for producing copper-containing container steel plates using accurate determination of copper content in nickel-copper alloys
  • Method for producing copper-containing container steel plates using accurate determination of copper content in nickel-copper alloys

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Embodiment

[0077] Embodiment: the method for copper content in the present invention's mensuration nickel-copper alloy adopts following specific steps:

[0078] Use dilute nitric acid to dissolve the sample, ammonia water to separate the iron interfering elements, adjust the pH=5.5 in the filtrate, add excess ethylenediaminetetraacetic acid EDTA solution to complex all the elements that can be complexed, and then add thiourea, 1.10-di The combined masking agent composed of nitrogen phenanthrene (o-phenanthroline) and ascorbic acid selectively decomposes the Cu-EDTA complex, and finally titrates the released EDTA with zinc standard solution, and the copper content can be obtained by calculation.

[0079] (1) Sample dissolution: Weigh 0.5004g of nickel-copper alloy sample into a 200mL beaker, add 20mL (1+2, 1 part of concentrated nitric acid + 2 parts of water) nitric acid, heat until completely dissolved, remove and cool, and constant volume In a 250mL volumetric flask, the sample solutio...

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Abstract

The invention provides a method for producing copper-containing container steel plates by using the accurate measurement of copper content in nickel-copper alloys. The above-mentioned method for producing copper-containing container steel plates includes: molten iron pretreatment, converter smelting, LF furnace refining, slab continuous casting, steel billet Heating, rough rolling, finish rolling and coiling; wherein, the converter smelting includes: first measuring the copper content in the nickel-copper alloy, and then adding the nickel-copper alloy; accurately controlling the copper content; The temperature is 1300±30°C; the determination of the copper content in the nickel-copper alloy includes the following: interference separation, determination of the copper content in the filtrate, correction of the precipitation adsorption, and the comparison of the copper content measured in the filtrate with the copper content determined by the correction of the precipitation adsorption The contents are added together; the interference separation is the separation of iron interference elements with ammonia water; correction is carried out by measuring the copper content in the test solution with ICP spectroscopy. The casting slabs and steel products produced by the invention have good surface quality, and no defects such as cracks, pockmarks, peeling, cracks and the like are found.

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 plates 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 weathe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16G01N21/78G01N21/73C22C38/50C22C38/42C22C38/06C22C38/04C22C38/02
CPCG01N31/16G01N21/78G01N21/73C22C38/02C22C38/04C22C38/002C22C38/42C22C38/06C22C38/50C22C38/001
Inventor 欧军刘川俊雷坚李宗强黄义伟陈海胡麟刘祖强熊小庆
Owner LIUZHOU IRON & STEEL
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