Steel sheet for can, and process for producing same

A technology for cans and steel sheets, which is applied to high-strength and high-workability steel sheets for cans and their manufacturing fields, can solve the problems of poor workability and lack of ductility of DR materials, and achieve the effect of improving workability.

Inactive Publication Date: 2013-08-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DR material is a thin and hard steel plate due to work hardening by cold rolling after annealing, but DR material lacks ductility, so its workability is inferior to SR material

Method used

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  • Steel sheet for can, and process for producing same
  • Steel sheet for can, and process for producing same
  • Steel sheet for can, and process for producing same

Examples

Experimental program
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Effect test

Embodiment

[0095] Steels containing the composition shown in Table 1 and the remainder consisting of Fe and unavoidable impurities were trial-produced, and steel slabs were obtained by casting. After reheating the obtained steel slab at 1250 degreeC, hot rolling and primary cold rolling were implemented on the conditions shown in Table 2 after that. The finishing temperature of the hot rolling was set to 890° C., and pickling was performed after rolling. Next, after the primary cold rolling, continuous annealing at a soaking temperature of 630° C. for a soaking time of 25 seconds and secondary cold rolling under the conditions shown in Table 2 were performed.

[0096] Sn plating was continuously performed on both sides of the steel sheet obtained above, and the amount of Sn deposited on one side was 2.8 g / m 2 tinplate. The test results are shown in Table 2 and Table 3. It should be noted that the grain size, N amount, and nitride number density in Table 3 refer to the average grain si...

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Abstract

The present invention provides a steel sheet for cans which has high strength and high processability, characterized by containing, in terms of mass%, 0.070-0.080%, excluding 0.080%, C, 0.003-0.10% Si, 0.51-0.60% Mn, etc. and by having, in a rolling-direction cross-section thereof, an average crystal-grain diameter of 5 [mu]m or more and a crystal-grain elongation rate of 2.0 or less. The steel sheet is further characterized in that the hardness difference obtained by subtracting the average Vickers hardness of a cross-section ranging from the surface to a depth of 1/8 the sheet thickness from the average Vickers hardness of a cross-section ranging from a depth of 3/8 the sheet thickness to a depth of 4/8 the sheet thickness is 10 points or more and/or the hardness difference obtained by subtracting the maximum Vickers hardness of the cross-section ranging from the surface to a depth of 1/8 the sheet thickness from the maximum Vickers hardness of the cross-section ranging from a depth of 3/8 the sheet thickness to a depth of 4/8 the sheet thickness is 20 points or more. The steel sheet is furthermore characterized by having a tensile strength of 500 MPa or higher and an elongation at fracture of 10% or higher. Also provided is a process for producing the steel sheet. This steel sheet for cans, which has high strength and high processability, is suitable for use as a material for easy-to-open cans.

Description

technical field [0001] The present invention relates to a high-strength and highly workable steel plate for cans and a method for producing the same. Background technique [0002] Among steel sheets used for beverage cans and food cans, steel sheets called DR (Double Reduce) materials are sometimes used for lids and bottoms, can bodies of three-piece cans, deep-drawn cans, and the like. Compared with the SR (Single Reduce) material that is only temper rolled with a small rolling ratio, the DR material that is cold-rolled (secondary cold rolling) after annealing is easier to reduce the thickness of the plate, and the reduction can be achieved by using a thin steel plate. tank cost. The DR material is a thin and hard steel plate due to work hardening by cold rolling after annealing, but the DR material lacks ductility, so its workability is inferior to that of the SR material. [0003] In addition, EOE (Easy Open End) is widely used as the lid of beverage cans and food cans....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D1/76C21D9/46
CPCC21D8/0426C21D8/0436C21D8/0468C21D9/48C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/06C21D1/76C21D9/46
Inventor 多田雅毅田中匠小岛克己岩佐浩树飞山洋一
Owner JFE STEEL CORP
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