Production process of hot-rolled strip for cold-rolling and hot-dip galvanizing

Abstract

The invention relates to a production technique of hot-rolled strip steel for cold-rolling hot-galvanizing. The production technique is characterized in that converter blowing and ladle argon blowing are utilized to control the components of molten steel: 0.06%-0.09% of C, 0.35%-0.42% of Mn, 0.02%-0.025% of S, 0.018%-0.022% of P, 0.1%-0.16% of Si, 0.004%-0.006% of Als, 0.035-0.042% of Ni and 0.027%-0.031% of Gr; and hot-rolling is utilized to control the heating temperature at 1150-1250 DEG C, the finish rolling start temperature at 1000+ / -20 DEG C, the finishing temperature at 900-920 DEG C and the coiling temperature at 600-640 DEG C. The technique lowers the desulfurization, dephosphorization and decarburization strength under the condition of no refining furnace; and the product has favorable cold-rolling physical properties and favorable hot-galvanizing properties.

Description

technical field [0001] The invention relates to a steel strip production process, in particular to a production process for producing hot-rolled strip steel for cold-rolling and hot-dip galvanizing with excellent hot-dip galvanizing performance by optimizing the composition of molten steel, strengthening rolling control and heat control. Background technique [0002] In recent years, galvanized steel sheets have been widely used in household appliances, office machines, steel furniture and other fields. In order to improve decoration, while requiring good coating performance, the requirements for thinner zinc layers have gradually increased, which has also become a galvanized coating. The difficulty of the process. Relevant studies have shown that the chemical composition of the steel base and the surface morphology of the strip are the key factors affecting the production of thin hot-dip galvanized strip. Therefore, hot-rolled strip steel enterprises have been committed to...

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Problems solved by technology

The above article only pointed out the influence of various components on galvanizing in the case of low silicon, and the research on the best components corresponding to other elements when the Si content is ≥0.1 has not been achieved so far.

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