A kind of tinplate base material for bottle cap with low defect rate and its production process of reduction

Abstract

The invention discloses a tinplate base material used for a low-defect-rate bottle cap and a reduction production technology and belongs to the technical field of steel making and steel rolling. The control range of chemical components of the bottle cap steel base material include, by weight percent, 0.05%-0.08% of C, 0.60%-0.75% of Mn, smaller than or equal to 0.015% of Si, smaller than or equal to 0.020% of S, smaller than or equal to 0.020% of P, 0.025%-0.040% of Al, smaller than or equal to 0.008% of As, smaller than or equal to 0.003% of N, smaller than or equal to 0.003% of O and the balance iron and inevitable impurities. A continuous casting peritectic area is avoided by limiting the control range of the carbon chemical components, the defect of solution strengthening caused by carbon drop is overcome by improving the carbon control target, after-furnace slag washing and large-air-capacity argon blowing are used for replacing vacuum refining to ensure steel cleanliness, and a chamfer crystallizer and specific protection slag are adopted for ensuring the surface quality of a casting blank. An RH vacuum refining technology is omitted, and better finished product edge portion quality is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and steel rolling, and in particular relates to a tinplate base material for bottle caps with a low defect rate and a reduction production process, which solves the line-shaped defects at the edge of the steel base material for bottle caps through steelmaking and continuous casting. Background technique [0002] 1. The production process of tinplate base material for bottle caps is complex and has many technical difficulties, and each process will affect its performance and surface quality. The requirements for the technical conditions of steel for bottle caps are based on the bending resistance of products after cold-rolling and annealing, and the industry standard requires it to be within the range of 120-145N; After edge trimming and cold rolling, no defects visible to the naked eye due to stress concentration of the base material or internal defects are allowed. [0003] 2. The mechanical...

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Problems solved by technology

[0004] 3. At present, the steel materials for making bottle caps are basically peritectic steel, which is aluminum with 0.08≤w(C)≤0.13%, 0.45%≤w(Mn)≤0.55%, and at the same time, S≤0.010% and P≤0.020%. Killed steel, the probability of longitudinal cracking in the production of continuous casting slabs with this composition is high, and the surface problems brought about are inherited to the cold rolling process, resulting in a high scrap rate in cold rolling production

In 2011, Northeastern University’s material processing engineering master’s degree thesis “Influence of production process bottle cap tinplate structure and performance” and other documents proposed that 0.08≤w(C)≤0.13%, 0.45%≤w(Mn)≤0.55 in steel %, add about 0.03% Ti, select the final rolling temperature of 870 ° C, the coiling temperature of 560 ° C, the cold rolling reduction rate of 89% to 91%, the annealing temperature of 550 ° C, the leveling pressure of 0.06mm, can obtain a more ideal The performance index of the substrate, but the steel in this composition range is still in the peritectic region, continuous casting control is difficult, and surface cracks are still prone to appear, and the addition of Ti will increase the anisotropy of the strip and increase the production cost

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