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Steel sheet for extreme thin container and method for manufacturing the same

A manufacturing method, steel plate technology, applied in the direction of manufacturing tools, coatings, furnace types, etc., can solve problems such as deformation, and achieve the effect of improving deformation resistance

Inactive Publication Date: 2007-08-08
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The subject of the present invention is to solve the problems of the prior art as described above, and to provide a steel plate and a manufacturing method thereof, in which the surface layer of the material is controlled by nitriding, in order to solve the problem of deformation of containers made of extremely thin materials. And the material of the inner layer, so that they vary greatly, and they still have good ductility even in hard places

Method used

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  • Steel sheet for extreme thin container and method for manufacturing the same
  • Steel sheet for extreme thin container and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] For a three-piece can whose barrel portion is formed by welding, a three-piece can barrel is manufactured using a steel plate whose nitrides are controlled by changing the nitriding conditions. Deformation resistance was measured when a cylindrical die with a diameter of 10 mm and a length of 40 mm was squeezed into the barrel of a can, and the end of the cap was flanged as in the usual cap crimping.

[0105] For the deformation test, the relationship between the extrusion amount of the mold and the extrusion load is shown in Figure 2, and an inflection point appears at a certain load. The load at which this inflection point appeared was used as an index of deformation resistance. The higher the value, the smaller the deformation caused by external force and the better the deformation resistance.

[0106] Furthermore, for flange forming, the length of the flange until a crack appeared in the flange portion was measured. The longer this length is, the better the flange...

Embodiment 2

[0112] Continuous casting is used to manufacture a 250mm thick billet containing C: 0.02%, Si: 0.02%, Mn: 0.2%, P: 0.01%, S: 0.01%, Al: 0.04%, and N: 0.002% in mass %. Slab heating temperature: 1100°C, finish rolling temperature: 880°C, and coiling temperature: 600°C were used to manufacture a 2.0 mm thick hot-rolled sheet. Pickling and cold rolling to 0.17mm, and recrystallization annealing at 650°C for 30 seconds in a continuous annealing unit.

[0113] A part of the material passes through a nitriding treatment furnace connected to the annealing furnace of the continuous annealing unit and filled with an atmosphere containing ammonia for nitriding treatment. In the nitriding treatment furnace, no heating equipment was installed, and the plate material in the state heated in the recrystallization annealing furnace was entered into the nitriding treatment furnace at 650° C. to perform nitriding. The atmosphere in the nitriding furnace is heated by the heat brought in by the ...

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Abstract

This steel sheet for an ultrathin container contains, in terms of mass %, C of 0.0800% or less, N of 0.600% or less, Si of 2.0% or less, Mn of 2.0% or less, P of 0.10% or less, S of 0.05% or less, and Al of 2.0% or less. The steel sheet has a. region in which nitrides of 1 [mu]m or less and 0.02 [mu]m or more in diameter exist in a surface layer within 1 / 8 thickness of the steel sheet at the number density of 0.2 piece / [mu]m 3 or more, and satisfies the formula (A) (the number density at the 1 / 8 sheet thickness position of the steel sheet) > (the number density at the 1 / 4 sheet thickness position of the steel sheet) ... (A). Alternatively, in the steel sheet, nitrides of 1 [mu]m or less and 0.02 [mu]m or more in diameter satisfy the formula (B) (the number density at the 1 / 20 sheet thickness position of the steel sheet) / (the number density at the 1 / 4 sheet thickness position of the steel sheet) > 1.5 ... (B).

Description

technical field [0001] The present invention relates to a steel plate used for metal containers such as beverage cans and a manufacturing method thereof. Background technique [0002] For steel plates for containers such as beverage cans and food cans, steel plates are becoming thinner in order to reduce the cost of containers, and materials with a thickness of 0.2mm or less are also suitable. One of the obvious problems in making containers from such ultra-thin materials is deformation of the container. [0003] This is not only due to the deformation of the container due to the external force caused by the transfer of the container in the general market after the container is manufactured and filled with the contents, but also due to the increase and decrease of the internal pressure of the container, that is, the pressurization and pressure of the contents during heat treatment. The deformation of the container can be caused by the decompression treatment for holding the...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/06C22C38/60C21D9/46C23C8/26
CPCC21D9/46C23C8/26C22C38/06C22C38/02C22C38/004C22C38/12C22C38/04C21D8/1216C22C38/60
Inventor 村上英邦
Owner NIPPON STEEL CORP
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