Very thin hard steel sheet and method for producing the same

An extremely thin, hard technology used in toolmaking, metal rolling, furnace types, etc., to solve problems such as not paying special attention to uniform elongation, and not addressing fracture or necking surface properties

Active Publication Date: 2009-04-22
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, these methods do not particularly focus on uniform elongation, and although the elongation (total elongation) is high, the elongation is often improved by local elongation.
Therefore, in practical application, the problems of the present application, such as defects in surface properties caused by fracture or necking, have not been solved.

Method used

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  • Very thin hard steel sheet and method for producing the same
  • Very thin hard steel sheet and method for producing the same
  • Very thin hard steel sheet and method for producing the same

Examples

Experimental program
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Embodiment 1

[0109] Table 2 shows the experimental results when the second phase was defined as an oxide. The form of oxides is mainly controlled by the size of oxides depending on casting conditions and the amount of elongation depending on hot rolling conditions. The "number density" of oxides was determined by observation with SEM. It was confirmed that favorable uniform elongation was obtained by controlling the state of oxides within the range of the present invention.

Embodiment 2

[0111] Table 3 shows the experimental results when the second phase was defined as sulfide. The form of the sulfide is mainly controlled by the size of the sulfide depending on the casting conditions and the amount of elongation depending on the hot rolling conditions. The "number density" of the sulfide was determined by cross-sectional observation using TEM. It was confirmed that good uniform elongation was obtained by controlling the state of the sulfide within the range of the present invention.

Embodiment 3

[0113] Table 4 shows the experimental results when the second phase was defined as carbide or nitride. The morphology of carbides or nitrides is mainly controlled by carburizing or nitriding conditions. The "roughly machined thin steel material" in this embodiment is a steel plate subjected to recrystallization annealing at 700°C. As a comparative material, a steel sheet that has not been carburized or nitrided but has a hardness equivalent to that of a carburized or nitrided steel sheet by re-cold rolling also shows its characteristics. Carbide or nitride was observed at the 1 / 8th position of the plate thickness and the center of the plate thickness. The "number density" of carbides or nitrides is determined by SEM observation of residues when electrolysis is performed on the surface layer 1 / 8 of the plate thickness or the center layer 1 / 4 of the plate thickness. The "volume fraction" and "number density" of the second phase in Table 4, and the values ​​of the main phase ar...

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Abstract

Disclosed is a very thin hard steel sheet having a thickness of not more than 0.400 mm and containing, in mass %, 0-0.800% (inclusive) of C, 0-0.600% (inclusive) of N, 0-2.0% (inclusive) of Si, 0-2.0% (inclusive) of Mn, 0-0.10% (inclusive) of P, 0-0.100% (inclusive) of S, 0-3.0% (inclusive) of Al and 0-0.200% (inclusive) of O. Secondary phases having an average length of not less than 0.10 [mu]m and an average breadth of not less than 0.05 mu m, while satisfying the following relation: average length/average breadth >= 2.0 are contained in the steel sheet at a volume fraction of not less than 0.05%.

Description

technical field [0001] The present invention relates to a thin steel plate having a thickness of 0.400 mm or less including a surface-treated steel plate used in electric machines, electronic parts, building materials, and metal containers, and a method for producing the same. [0002] This application uses Japanese Patent Application No. 2006-102766 as a basic application, and uses the content thereof. Background technique [0003] Thin steel sheets with a thickness of 0.400 mm or less are used in various applications such as electrical appliances, electronic components, building materials, and metal containers. However, further reductions in the thickness of steel sheets are being made in order to reduce the cost of raw materials. If the material is made thinner, the strength of the parts using it will also decrease. Therefore, it is generally required to harden the material along with thinning. One of the problems evident in such extremely thin hard materials is deterior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B1/26B21B3/00C21D1/06C21D9/46C22C38/60
CPCC22C38/14C22C38/42C21D9/46C22C38/004C22C38/06C22C38/48B21B1/40C22C38/02C21D1/06C22C38/04C22C38/60C21D8/0426C21D8/0436C21D8/0442C21D8/0457C21D9/48C21D2201/05C21D2211/004C21D2211/005
Inventor 村上英邦
Owner NIPPON STEEL CORP
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