Corrosion-resistant soft cold-rolling tin plate and production method thereof

Abstract

The invention discloses a corrosion-resistant soft cold-rolling tin plate and a production method thereof. The corrosion-resistant soft cold-rolling tin plate comprises the following chemical components by weight percent: 0.01%-0.04% of C, less than or equal to 0.02% of Si, 0.10%-0.40% of Mn, less than or equal to 0.01% of P, less than or equal to 0.012% of S, less than or equal to 0.011% of Sn, less than or equal to 0.01% of As, 0.005%-0.050% of solAl, less than or equal to 0.004% of N and the balancing of Fe and unavoidable impurities. The production method comprises the steps of hot-metal desulphurization, dephosphorization, converter melting, RH (Ruhrstahl-Heraes) vacuum treatment, continuous casting, continuous hot-rolling, pickling, cold-rolling, electrolytic degreasing, full-hydrogen furnace bell-type annealing (BA), leveling and electrotinning and the like. According to the practice, the uncoated tin plate base of the invention has the advantages of low hardness value and high corrosion resistance at the same time; since the production method thereof is based on the bell-type annealing manner, the production method of the invention has the advantages of low difficulty level of production control, low cost and easy implementation in large-scale production and helps users reduce the cost.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting materials, and in particular relates to a corrosion-resistant soft cold-rolled tin plate and a production method thereof. Background technique [0002] There are two annealing methods for cold-rolled tinplate, namely bell furnace annealing (BA) and continuous annealing (CA). Generally, the annealing time of the bell furnace annealing method is about 10-20 hours, which can make the recrystallized grains fully grow. After the bell annealing, the grain size of the steel can generally reach 7-10 grades. Furnace annealing is suitable for the production of soft tinplate with lower hardness levels such as T-1, T2, and T2.5. The annealing time is short in the continuous annealing method, generally 3 to 5 minutes, the heating and cooling are very fast, and the recrystallization time of the steel strip is short, so the grains are difficult to grow. The grain size of the steel after continuous anneali...

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Problems solved by technology

However, the annealing method used in this process is continuous annealing. The content of C in the substrate composition is low, and the alloy element Ti is added, which belongs to IF steel. However, the temperature of IF steel is high during continuous annealing, and the steel strip is prone to bending and breaking. As a result, the process yield is low, the production cost is high, and the hardness value is high, so it is difficult to apply to deep drawing processing

[0004] In summary, due to the short annealing time and high annealing temperature in the production of soft tinplate by continuous annealing, it is easy to cause the steel strip to buckle and break, so it is very difficult to implement in large-scale production, and the production cost is high ; In addition, due to the short annealing time, fast heating and cooling, the tinplate produced has high hardness, so it is difficult to obtain soft tinplate suitable for deep drawing

However, there is no report on the production of soft corrosion-resistant cold-rolled tinplate with a hardness of HR30T of 49±3 by annealing in a bell furnace.