Uncoated tinplate base for acidic food can and manufacturing method thereof

Abstract

The invention discloses an uncoated tinplate base for an acidic food can and a manufacturing method thereof. The uncoated tinplate base for the acidic food can comprises the following chemical components in percentage by weight: 0.01 to 0.13 percent of C, less than or equal to 0.20 percent of Si, 0.30 to 0.50 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S; less than or equal to 0.080 percent of Cu, less than or equal to 0.080 percent of Ni, less than or equal to 0.020 percent of Sn, less than or equal to 0.020 percent of Mo, less than or equal to 0.080 percent of Cr, 0.010 to 0.040 percent of Als, less than or equal to 0.004 percent of N, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: after molten iron desulphurization, performing converter re-blowing smelting and vacuum treatment; performing continuous casting, and then performing hot rolling, acid pickling and cold rolling ona casting blank; and performing electrolytic tinning after electrolytic cleaning, annealing and double-machine flattening in turn. The acid dipping time lag value of the uncoated tinplate base manufactured by the method is lower than that of the prior ordinary uncoated tinplate base, and the salt spray corrosion resistance and the filled can corrosion resistance are better than that of the ordinary uncoated tinplate base.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting materials, and in particular relates to a tin-plated raw plate for acid food cans and a manufacturing method thereof. Background technique [0002] The corrosion resistance of the tinplate substrate is an important performance index of the tinplate. At present, the tinplate substrate used for acidic food cans at home and abroad has a relatively high corrosion resistance due to the high content of impurities in the steel. Poor, and because some acidic food cans cannot be painted inside during use, such tinplate often causes local corrosion and perforation of acidic food cans during use. [0003] Before the present invention, the PRODUCTION OF T-3MILD BLACKPLATE HAVING EXCELLENT CORROSION RESISTANCE BY CONTINUOUSANNEALING.Japan.No.JP58027933, 1983-02-18 patent of Japanese Kawasaki Iron and Steel Company provided a kind of low carbon aluminum killed steel, its chemical composition (wt%) ) is c...

AI Technical Summary

Problems solved by technology

However, the products of these two inventions have no clear restrictions on the content of many impurity elements in the steel, the purity of the steel plate material is not high, and the corrosion resistance in the acidic corrosion environment still needs to be further improved