Method for producing cmanufacturing steel sheet

Abstract

Provided is a method of manufacturing a steel sheet for cans, where excessively high strengthening due to work hardening in cold-rolling is avoided, and thickness variation in the longitudinal direction of a steel sheet coil is inhibited, in a reduction in the steel sheet manufacturing cost by omitting the recrystallization annealing step. The steel compositions contain, in mass%, C: 0.005% or less, Mn: 0.05 to 0.5%, Al: 0.01 to 0.10%, N: 0.0010 to 0.0070%, and B: 0.15xN to 0.75xN (0.20xN to 0.97xN in atomic ratio) and further contain either or both Nb: 4xC to 20×C (0.52xC to 2.58xC in atomic ratio) and Ti: 2xC to 10×C (0.50xC to 2.51×C in atomic ratio), and the balance is Fe and inevitable impurity elements. The steel is continuously cast into a slab, the slab is hot-rolled at a finishing temperature of not higher than Ar 3 transformation point, and the hot-rolled steel sheet is subjected to coiling, pickling, and then cold-rolling at a reduction of 50 to 96%.

Description

technical field

[0001] The present invention relates to a method of manufacturing a steel sheet for can making which is excellent in plate thickness accuracy, and particularly relates to a method of manufacturing a steel sheet for can making which is suitable for applications in which the height of a can is drawn to the same degree as the diameter of the can body, Or the use of bending into a cylindrical shape or a square cylindrical shape, joining the ends to form a can body, and then performing flange processing. Background technique

[0002] Cans such as beverage cans, food cans, 18-liter cans, and drums can be roughly classified into two-piece cans and three-piece cans according to their manufacturing methods (processes).

[0003] The two-piece can is composed of two parts, and the surface-treated steel plate that has been treated with tin plating, chrome plating, metal oxide coating treatment, chemical conversion treatment, inorganic coating treatment, organic resin coa...

Examples

Embodiment 1

[0062] Examples are described below.

[0063] The various steels shown in Table 1 are smelted to form billets, heated at a heating temperature of 1100-1250°C, hot-rolled at the finishing temperature shown in Table 1, and coiled at a coiling temperature of 680°C. Pick. Next, after pickling, cold rolling was performed at a rolling ratio of 90%.

[0064] The thickness change of the steel sheet obtained as above was evaluated. The change in sheet thickness was evaluated by measuring the sheet thickness after cold rolling for the entire length of the steel sheet coil length with an X-ray sheet thickness meter installed in the cold rolling facility, and evaluating it as a rate of change relative to the average sheet thickness. A steel plate whose rate of change was less than or equal to ±3% acceptable as a product was regarded as acceptable and indicated by ◯, and a steel sheet whose change rate exceeded ±3% was regarded as unacceptable and indicated by ×.

[0065] In addition, i...

Embodiment 2

[0069] The various steels shown in Table 2 are smelted and made into steel slabs, and after heating at a heating temperature of 1100-1250°C, the Ar 3 Hot rolling was performed at a finish rolling temperature of 820°C or below the transformation point, and coiling was performed at the coiling temperature shown in Table 2. Next, pickling was performed, and cold rolling was performed at the rolling ratio shown in Table 2.

[0070]The thickness change of the steel sheet obtained as above was evaluated. The change in sheet thickness was evaluated by measuring the sheet thickness after cold rolling for the entire length of the steel sheet coil length with an X-ray sheet thickness meter installed in the cold rolling facility, and evaluating it as a rate of change relative to the average sheet thickness. The evaluation results are shown in Table 2. A steel plate whose rate of change was less than or equal to ±3% acceptable as a product was regarded as acceptable and indicated by ◯, ...

technical field

[0001] The present invention relates to a method of manufacturing a steel sheet for can making which is excellent in plate thickness accuracy, and particularly relates to a method of manufacturing a steel sheet for can making which is suitable for applications in which the height of a can is drawn to the same degree as the diameter of the can body, Or the use of bending into a cylindrical shape or a square cylindrical shape, joining the ends to form a can body, and then performing flange processing. Background technique

[0002] Cans such as beverage cans, food cans, 18-liter cans, and drums can be roughly classified into two-piece cans and three-piece cans according to their manufacturing methods (processes).

[0003] The two-piece can is composed of two parts, and the surface-treated steel plate that has been treated with tin plating, chrome plating, metal oxide coating treatment, chemical conversion treatment, inorganic coating treatment, organic resin coa...

Examples

Embodiment 1

[0062] Examples are described below.

[0063] The various steels shown in Table 1 are smelted to form billets, heated at a heating temperature of 1100-1250°C, hot-rolled at the finishing temperature shown in Table 1, and coiled at a coiling temperature of 680°C. Pick. Next, after pickling, cold rolling was performed at a rolling ratio of 90%.

[0064] The thickness change of the steel sheet obtained as above was evaluated. The change in sheet thickness was evaluated by measuring the sheet thickness after cold rolling for the entire length of the steel sheet coil length with an X-ray sheet thickness meter installed in the cold rolling facility, and evaluating it as a rate of change relative to the average sheet thickness. A steel plate whose rate of change was less than or equal to ±3% acceptable as a product was regarded as acceptable and indicated by ◯, and a steel sheet whose change rate exceeded ±3% was regarded as unacceptable and indicated by ×.

[0065] In addition, i...

Embodiment 2

[0069] The various steels shown in Table 2 are smelted and made into steel slabs, and after heating at a heating temperature of 1100-1250°C, the Ar 3 Hot rolling was performed at a finish rolling temperature of 820°C or below the transformation point, and coiling was performed at the coiling temperature shown in Table 2. Next, pickling was performed, and cold rolling was performed at the rolling ratio shown in Table 2.

[0070]The thickness change of the steel sheet obtained as above was evaluated. The change in sheet thickness was evaluated by measuring the sheet thickness after cold rolling for the entire length of the steel sheet coil length with an X-ray sheet thickness meter installed in the cold rolling facility, and evaluating it as a rate of change relative to the average sheet thickness. The evaluation results are shown in Table 2. A steel plate whose rate of change was less than or equal to ±3% acceptable as a product was regarded as acceptable and indicated by ◯, ...

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