High strength steel sheet for container, and method for producing same
A manufacturing method and high-strength technology, applied in the direction of manufacturing tools, metal rolling, furnace types, etc., can solve the problems of difficulty in taking into account ductility and strength, reduce the cost of can making, and ensure high strength and ductility. Improved edge workability and less wrinkle
Active Publication Date: 2016-12-21
JFE STEEL CORP
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Problems solved by technology
[0008] For DR materials used in the past, it is difficult to balance the above-mentioned ductility and strength
However, at present, from the viewpoint of reducing the cost of canning, there is an increased demand for the application of DR materials in the manufacture of EOE cans and beverage cans.
Method used
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Embodiment
[0086] A steel containing the composition shown in Table 1, with the balance consisting of Fe and unavoidable impurities was smelted in a real machine converter, and a billet was obtained by continuous casting. The obtained slabs were reheated at 1230°C, and then hot-rolled and primary cold-rolled under the conditions shown in Table 2. The finishing temperature of the hot rolling was set at 890°C, and pickling was performed after the first cold rolling. Next, after primary cold rolling, continuous annealing at a soaking temperature of 670° C. and a soaking time of 20 seconds, and secondary cold rolling under the conditions shown in Table 2 were performed.
[0087] In addition, the roughness of the roll of the 1st stand and the roughness of the roll of the 2nd stand measured the surface roughness Ra of the steel plate defined in JIS B 0601 by the method defined in JIS B0633.
[0088] Sn plating was continuously performed on both sides of the steel sheet obtained as above, and ...
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Abstract
Provided are a high strength steel sheet for a container, which can be advantageously used as a lid of a can, and which is particularly suitable for use as a material for an EOE can; and a method for producing same. The high strength steel sheet has a constituent composition that contains, in terms of mass %, 0.0010-0.10% of C, 0.04% or less of Si, 0.10-0.80% of Mn, 0.007-0.100% of P, 0.10% or less of S, 0.001-0.100% of Al and 0.0010-0.0250% of N, with the balance being Fe and unavoidable impurities. A difference between the dislocation density in the outermost surface layer and the dislocation density at a depth from the surface of 1 / 4 of the sheet thickness is 1.94*10<14> m<-2> or less in the sheet thickness direction, a tensile strength is 400 MPa or more, and a breaking elongation is 10% or above.
Description
technical field [0001] The invention relates to a steel plate for high-strength containers and a manufacturing method thereof. Background technique [0002] Steel sheets called DR (Double Reduce) are sometimes used in the manufacture of lids and bottoms of beverage cans and food cans, bodies of three-piece cans, drawn cans, and the like. Compared with the SR (Single Reduce) material obtained by only skin pass rolling after cold rolling and annealing, the DR material obtained by cold rolling again after cold rolling and annealing is more likely to reduce the plate thickness. [0003] However, in order to reduce the cost of canning, first consider reducing the weight of the components used. For example, can lids can be reduced in weight by reducing the thickness of the material. That is, when the steel plate used for manufacture is thinned by using DR material etc., can manufacturing cost can be reduced. [0004] Can manufacturing costs can be reduced by reducing the thickn...
Claims
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IPC IPC(8): C22C38/00B21B1/22C21D9/46C22C38/06
CPCB21B1/22C22C38/00C22C38/06C21D8/0226C21D8/0236C21D8/0263C21D8/0268C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C21D9/46B21B2001/221B21B2001/225
Inventor 多田雅毅斋藤勇人小岛克己中丸裕树
Owner JFE STEEL CORP