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Ferritic stainless steel sheet excellent in punching and shearing workability and manufacturing method thereof

A technology with excellent workability and stainless steel plate, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of shortening tool life, shearing tool wear, etc., achieving excellent punching and shearing workability, excellent corrosion resistance, and expanded use. Effect

Active Publication Date: 2017-04-12
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technology, there is a problem that FeTiP promotes the wear of the shearing tool and shortens the tool life.

Method used

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  • Ferritic stainless steel sheet excellent in punching and shearing workability and manufacturing method thereof
  • Ferritic stainless steel sheet excellent in punching and shearing workability and manufacturing method thereof
  • Ferritic stainless steel sheet excellent in punching and shearing workability and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0048] The component composition of the ferritic stainless steel sheet according to the first embodiment will be described. In addition, the unit % which shows element content means mass %.

[0049] (C: 0.016% by mass or less)

[0050] C causes sensitization by forming Cr carbides. Therefore, in this embodiment, by adding Ti or Nb, carbide is formed to fix C. TiC is fine and has the effect of promoting work hardening by precipitation strengthening of steel. However, if the C content exceeds 0.016 mass%, a large amount of Ti needs to be added, so the C content is made 0.016 mass% or less, preferably 0.012 mass% or less. From the viewpoint of avoiding deterioration of corrosion resistance due to C, the less the content, the better, but excessively reducing the amount of C will lead to an increase in refining costs, so it is preferably set to 0.001% by mass or more. In addition, in consideration of production costs and the like, it is preferably specified as 0.002% by mass to...

no. 2 Embodiment approach

[0131] The component composition of the ferritic stainless steel sheet according to the second embodiment will be described.

[0132] (C: 0.020% by mass or less)

[0133] C causes sensitization by forming Cr carbides. Therefore, in this embodiment, by adding Ti or Nb, carbide is formed to fix C. TiC is fine and has the effect of promoting work hardening by precipitation strengthening of steel. However, if the C content exceeds 0.020% by mass, a large amount of Ti or Nb needs to be added, so the C content is made 0.020% by mass or less. Preferably it is 0.012 mass % or less. From the viewpoint of avoiding deterioration of corrosion resistance due to C, the less the content, the better, but excessively reducing the amount of C will lead to an increase in refining costs, so it is preferably set to 0.001% by mass or more. In addition, in consideration of production costs and the like, it is preferably specified as 0.005% by mass to 0.010% by mass.

[0134] (Si: 0.80% by mass ...

Embodiment 1

[0220] Hereinafter, examples corresponding to the ferritic stainless steel plate of the first embodiment will be shown.

[0221] Steels of component Nos. 1-1 to 1-38 having the component compositions shown in Table 1A and Table 1B were melted to produce steel ingots. Next, hot rolling was performed under the conditions shown in Table 2A, Table 2B, and Table 2D to produce a hot-rolled sheet having a thickness of 4 mm. The hot-rolled sheet was annealed by continuous annealing at 890°C. After pickling, cold rolling was performed to obtain a cold-rolled sheet having a sheet thickness of 1 mm.

[0222] Next, the above-mentioned cold-rolled sheet was subjected to final annealing at the temperatures shown in Table 2A, Table 2B, and Table 2D to obtain a cold-rolled annealed sheet. The cold-rolled and annealed sheets obtained as above were subjected to the following tests.

[0223] (Evaluation of punching and shearing properties)

[0224] The above-mentioned cold-rolled annealed sh...

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Abstract

The present invention provides an aspect of a ferritic stainless steel sheet containing C: 0.016% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.010 to 0.035%, and S: 0.005% or less, Al: 0.50% or less, N: 0.018% or less, Cr: 15.6 to 17.5%, Cu: 0.10 to 0.50%, Sn: 0.01 to 0.3%, and Ti: 0.05 to 0.30%, Nb: 0.05 to 0.40%, Mo: 0.05-0.50%, and Ni: 0.05-0.50% or more, the rest contains Fe and unavoidable impurities, the Cu concentration on the surface of the steel plate is 15% or more in terms of cation fraction, ferrite The particle size is 30 μm or less.

Description

technical field [0001] The present invention relates to a ferritic stainless steel plate excellent in punching workability that can be used for kitchen and household appliances, utensils, coins, containers, and the like, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. 2013-062077 filed in Japan on March 25, 2013 and Japanese Patent Application No. 2013-067972 filed in Japan on March 28, 2013, the contents of which are incorporated herein. Background technique [0003] Ferritic stainless steel sheets are used in various applications such as buildings and transportation equipment, household electrical appliances, and kitchen utensils due to their excellent design and corrosion resistance. These products (structures) are usually produced through the steps of cutting, forming, and joining steel plates. When cutting, shearing is usually performed in view of productivity, but at this time, so-called "flash (m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/00C21D9/46C22C38/50C22C38/54
CPCC21D6/002C21D8/00C21D8/0247C21D9/46C21D2211/004C21D2211/005C22C38/001C22C38/002C22C38/004C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/42C22C38/44C22C38/48C22C38/50C22C38/60C22C38/54
Inventor 石丸咏一朗秦野正治盛田智彦高桥明彦
Owner NIPPON STEEL STAINLESS STEEL CORP