Method for increasing tin plated raw plate yield

Abstract

The invention discloses a method for increasing tin plated raw plate yield, which comprises the following manufacturing steps: pickling, cold rolling and degreasing a steel strip; uniformly coating a layer of inorganic salt solution on the degreased steel strip, wherein the inorganic salt solution comprises 5 to 13 weight percent of K2CO3, 2 to 12 weight percent of NaCl, 1 to 6 percent of MgO and the balance of H2O, the inorganic salt content in the coating is 1 to 50 grams per cubic meter, and a plate passing speed is 5 to 400m / min; coiling the steel strip coated with the inorganic salt solution, and annealing in a bell-type furnace according to a normal process, wherein slight decarburization is performed in flame lifting and the inorganic salt solution is changed into uniformly distributed fayalite powder, and the size is 1 to 5 mu m; flattening the annealed steel strip; and cleaning the flattened steel strip and removing the fayalite powder. When the method is used, yield is increased, the surface quality of the steel strip is improved, and bell-type bonding is avoided.

Description

technical field [0001] The invention relates to a cold-rolled thin plate and a production method of the thin plate, in particular to a method for improving the yield of the original tin-plated plate. . Background technique [0002] Tin plate is a thin-gauge product in the production of cold-rolled wide-band steel. The general raw material width is 1050~1250mm, and the thickness is 1.8~2.3mm. After 5~7 passes of cold rolling, the thickness of the finished product ranges from 0.12~0.25mm. At present, the typical specification of tinplate in China is 0.18~0.25mm×712mm×1024mm, and the amount of tin coating is 10.5g / m3, but users want to obtain products with a thickness of 0.15~0.21mm and larger length and width specifications. [0003] There are many cold rolling processes and complex processes in the production of tin-plated raw plates, mainly including pickling, cold rolling, degreasing, annealing and smoothing. The disadvantage is that the yield is low. At present, most col...

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Problems solved by technology

[0003] There are many cold-rolling processes and complex processes in the production of tin-plated raw plates, mainly including pickling, cold rolling, degreasing, annealing and smoothing, and the disadvantage is that the yield is low

At present, most cold rolling enterprises adopt continuous degreasing and full-hydrogen bell annealing furnace for treatment. The most likely defect in bell annealing furnace is adhesion, which affects the surface quality of the strip, reduces the yield, and even makes the whole Steel strip scrap

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