Production method of tinplate substrate with high yield strength and high elongation t~5

Abstract

The invention discloses a method for producing tinplate substrates with high yield strength and high elongation of T-5 tinplate under cover. , tension leveling process; the chemical composition of the substrate and its mass percentage content are: C: 0.08-0.13%, Mn: 0.30-0.60%, S≤0.010%, P≤0.015%, Si≤0.02%, Als: 0.030~0.060%, N≤0.0060%, Cu≤0.060%, Ni≤0.040%, Cr≤0.060%, Mo≤0.02%, the rest are iron and inevitable impurities, C+Mn / 6 is controlled at 0.16~0.20. The yield of the T-5 tinplate substrate produced by the production method of the present invention is 89-92%, and the T-5 tinplate substrate is produced by adopting the masking withdrawal process instead of the continuous withdrawal process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing a tinplate substrate with high yield strength and high extension T-5. Background technique [0002] With the rapid development of the national economy and the continuous improvement of people's consumption level, people's requirements for food packaging are also getting higher and higher. There are various materials for food packaging, in addition to metal, there are various wood, plastic, paper, bamboo materials. In metal packaging, tinplate packaging is the main one. Due to the continuous improvement and perfection of tinplate can printing technology and processing technology, the application of tinplate packaging has become more and more extensive, and the market share has increased rapidly and is increasing year by year. The development of green packaging materials is the trend of the world's packaging industry. Its main connotation is ...

AI Technical Summary

Problems solved by technology

[0003] Most domestic tinplate production lines are mainly cold-rolled hood-type annealing method (referred to as hood annealing). Due to the low yield ratio (generally, the yield strength is less than 340MPa) and poor resilience, it is easy to cause cans to be deflated, and the bending resistance index of the crown cover is biased. low level problem

The European standard EN10202:2001 has a maximum quenching and tempering degree of BA products of T~4BA, and the bashing process cannot stably produce high yield strength tinplate with a hardness of T~5, which has always been a recognized problem in the industry

[0004] It is produced by adding elements such as Nb and Ti to refine grains. Although it can increase the yield strength, the addition of alloying elements increases the fluctuation range of the yield strength, which cannot be accepted by downstream product companies.

[0005] Domestic tinplate enterprises without continuous annealing production lines cannot produce high yield strength T-5 tinplate, some tinplate enterprises produce T2. 5 hardness tinplate products, the elongation rate of T-5 hardness products produced by this process is very low, the actual value is ≤5%, which cannot meet the requirements of high hardness shallow punched two-piece cans

At the same time, the high leveling reduction rate, the dry leveling process is adopted on the tempering machine, due to the large heat generated by the cold rolling deformation, the temperature of the roll will rise, affecting the thermal crown of the roll, and the normal production cannot be stabilized; the wet leveling (most domestic tinplate The tempering machine of the enterprise does not have the function of wet leveling) or the rolling mill is used for emulsion lubrication and then the secondary cold rolling is carried out. This kind of process needs to add degreasing and other processes in the follow-up process, and the production cost will increase

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