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High-strength steel plate and manufacturing method thereof

A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of reducing drawability, achieve the effects of suppressing the generation of stamping cracks and reducing in-plane anisotropy

Active Publication Date: 2016-06-22
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] However, since the absolute value of the uniform elongation varies depending on the strength level, if the anisotropy ΔuEl of the uniform elongation is 4% or less, the strength level will be limited, and the {100} texture The development of it may reduce the drawability

Method used

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  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof

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Embodiment

[0143] Steel having the composition shown in Table 1 was smelted in a converter and cast into billets (steel raw materials) by continuous casting. Next, these slabs were heated to 1250° C. and subjected to rough rolling to produce thin slabs. Next, hot rolling was performed in which finish rolling was performed under the conditions shown in Table 2 to obtain hot-rolled sheets. After pickling these hot-rolled sheets, cold-rolled sheets were produced by the cold-rolling process of the rolling ratio (CR) shown in Table 2. These cold-rolled sheets were then continuously annealed at the annealing temperature (AnnT) shown in Table 2 in a continuous annealing line. Furthermore, elongation: 0.5% temper rolling was given to the obtained cold-rolled annealed sheet.

[0144] It should be noted that, as described above, the recrystallization temperature of each steel sheet was determined by observation of the structure after short-time heating and quenching, and was 700 to 760° C., and ...

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Abstract

According to the present invention, by including the following composition: by mass %, C: more than 0.0005% and less than 0.10%, Si: 1.5% or less, Mn: 0.1% or more and 3.0% or less, P: 0.080% or less, S: 0.03% Below, sol.Al: 0.01% to 0.50% and N: 0.005% or less, and contains one or both of Nb: 0.20% or less and Ti: 0.20% or less, the balance is Fe and unavoidable impurities; make the steel structure more than 60% ferrite phase by volume fraction; make the three-dimensional crystal orientation density function (ODF) {φ1, Φ, φ2} where Φ is 0°, φ1 is 0° and φ2 is 45 The strength of ODF {0°, 0°, 45°} at ° is 3.0 or less, and the strength of ODF {0°, 35°, 45°} when Φ is 35°, φ1 is 0°, and φ2 is 45° The range of 2.5 or more and 4.5 or less makes it possible to obtain a high-strength steel sheet that is less prone to cracking during press forming and has a small anisotropy in ductility.

Description

technical field [0001] The present invention relates to a high-strength steel sheet for use in automobiles, home appliances, etc., which is used through a press forming process, and a method for producing the same. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, in order to limit CO 2 emissions, requiring improvements in the fuel efficiency of automobiles. In addition, in order to ensure the safety of occupants at the time of a vehicle body collision, it is required to improve safety focusing on improving the collision characteristics of the vehicle body. In this way, not only to reduce the weight of the automobile body, but also to increase the strength of the automobile body is actively promoted. [0003] However, in order to meet both the weight reduction and strength improvement of automobile bodies, it is essential to increase the strength of the component materials within the range that does not affect the rigid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/60C21D9/46
CPCC21D9/46C22C38/14C21D6/008C22C38/001C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 奥田金晴
Owner JFE STEEL CORP
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