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High-strength steel sheet, and process for production thereof

A technology of high-strength steel plate and manufacturing method, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of manufacturing stability and other problems, and achieve the effect of excellent workability

Active Publication Date: 2012-05-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0038] However, in order to make the second phase a mixed structure of various phases and to control its percentage with high precision, precise control of heat treatment conditions is required, and in many cases, problems arise in terms of manufacturing stability and the like.

Method used

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  • High-strength steel sheet, and process for production thereof
  • High-strength steel sheet, and process for production thereof
  • High-strength steel sheet, and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] The steel sheet with the composition shown in Table 1 was heated to 1250°C, and then the hot-rolled steel sheet obtained by hot-rolling finish rolling at 880°C was coiled at 600°C, and then the hot-rolled steel sheet was pickled , Then, cold rolling was performed at a rolling reduction rate of 65% to produce a cold-rolled steel sheet having a thickness of 1.2 mm. The obtained cold-rolled steel sheets were heat-treated under the conditions shown in Table 2. In addition, normal quenching was not given to any of the samples in the same table. In addition, the holding time in Table 2 is the holding time at the holding temperature in Table 2. In addition, Ms in Table 2 was calculated|required by the said (1) formula.

[0152] In addition, some samples were subsequently subjected to hot-dip galvanizing treatment, and further alloying treatment was performed on a part of them. It should be noted that the above-mentioned hot-dip galvanizing treatment is carried out at the te...

Embodiment 2

[0169] The steel sheet with the composition shown in Table 4 was heated to 1250°C, and the hot-rolled steel sheet obtained by hot-rolling finish rolling at 880°C was coiled at 600°C, and then the hot-rolled steel sheet was pickled , Then, cold rolling was performed at a rolling reduction rate of 65% to produce a cold-rolled steel sheet having a thickness of 1.2 mm. The obtained cold-rolled steel sheets were heat-treated under the conditions shown in Table 5. In addition, normal quenching was not given to any of the samples in the same table. In addition, the holding time in Table 5 is the holding time at the holding temperature in Table 5. In addition, Ms in Table 5 was calculated|required by the said (1) formula.

[0170] In addition, some samples were subsequently subjected to hot-dip galvanizing treatment, and further alloying treatment was performed on a part of them. It should be noted that the above-mentioned hot-dip galvanizing treatment is carried out at the tempera...

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Abstract

Disclosed is a high-strength steel sheet having excellent processability and a tensile strength of 980 MPa or more. The high-strength steel sheet has the following composition (in mass%): C: 0.1 to 0.3% inclusive, Si: 2.0% or less, Mn: 0.5 to 3.0% inclusive, P: 0.1% or less, S: 0.07% or less, Al: 1.0% or less, and N: 0.008% or less, with the remainder being Fe and unavoidable impurities. The steel structure of the high-strength steel sheet comprises 50% or more of martensite, 50% or less (including 0%) of ferrite, 10% or less (including 0%) of bainite, and 10% or less (including 0%) of residual austenite. In the high-strength steel sheet, the half width in the degree distribution of the nano-hardness obtained by the measurement of the hardness distribution of the martensite is 2.0 GPa or more, and the steel sheet has a tensile strength of 980 MPa or more.

Description

technical field [0001] The present invention relates to a high-strength steel sheet with excellent formability and a tensile strength of 980 MPa or more used in the industrial fields of automobiles and electric appliances, and a method for producing the same. [0002] In addition, the high-strength steel sheet of the present invention includes a steel sheet that has been subjected to hot-dip galvanizing or galvannealing on the surface of the steel sheet. Background technique [0003] In recent years, improving the fuel efficiency of automobiles has become an important issue from the viewpoint of protecting the global environment. Therefore, there is an active trend toward thinning the wall by increasing the strength of vehicle body materials, and reducing the weight of the vehicle body itself. However, increasing the strength of a steel sheet leads to a decrease in formability, and therefore, the development of a material having both high strength and high formability has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60
CPCC21D8/0205C21D2211/008C21D9/46C22C38/06C22C38/02C22C38/28C22C38/04C21D2211/005C22C38/001C22C38/32C22C38/38C22C38/16C22C38/005C22C38/12C22C38/08C22C38/24
Inventor 松田广志水野玲子船川义正
Owner JFE STEEL CORP
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