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High-strength twip steel sheet and method of manufacturing the same

a steel sheet, high-strength technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of difficult economic production of products, low initial collision performance, complicated parts formed into, etc., and achieve the effect of improving the elongation ra

Inactive Publication Date: 2010-10-14
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0010]In one aspect, the present invention provides a high-strength TWIP steel sheet preferably having a yield strength of about 550 MPa and a suitably improved elongation rate, and a method of manufacturing the same.

Problems solved by technology

However, in the conventional technologies, although a high-tension steel sheet is required to increase the strength of a vehicle body, it cannot be formed into a complicated part because it has a low elongation rate, so that it is formed into several parts, and then the several parts are welded together to obtain a final product.
Further, when a collision member is manufactured through the conventional technologies, since the conventional TWIP steel sheet has a yield strength of about 400 MPa, which is lower than that of a transformation induced plasticity (TRIP) steel sheet or dual phase (DP) steel sheet having a tensile strength of about 980 MPa corresponding to the yield strength of about 400 MPa, the initial collision performance is low.
Further, although the conventional TWIP steel sheet must be suitably highly pressurized at the time of cold rolling in order to increase its yield strength, concomitant problems, such as fracture, side cracking and the like, occur because it has the characteristics of ultrahigh-tension steel.
As a result it is difficult to economically obtain products.

Method used

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  • High-strength twip steel sheet and method of manufacturing the same

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first embodiment

[0037]Accordingly, the present invention features, in preferred embodiments, two methods of suitably applying titanium to a TWIP steel sheet. In a first embodiment, interstitial free (IF) steel to which titanium (Ti) is preferably added through a low-cost process is suitably melted in a vacuum furnace, and then carbon and other components are added to the melted IF steel. Preferably, in this method, the oxidization of the titanium (Ti) added to the IF steel can be suitably prevented, and titanium (Ti) is not required to be further added thereto, so that this method may be a suitably economical method.

second embodiment

[0038]In a second embodiment, a powdered titanium-manganese (Ti—Mn) alloy is preferably prepared and then suitably added to steel at the time of refining the steel. Preferably, when the steel is made in the form of a metal matrix composite (MMC), the steel can have a desired component ratio without being influenced by its composition. In further preferred embodiments, when this MMC steel is suitably charged into the vacuum furnace, it is easily melted because the titanium-manganese (Ti—Mn) alloy powder has high surface energy (large surface area). Accordingly, in further related embodiments, it is suitably easily supercooled. This method is advantageous in terms of component control.

[0039]In certain preferred embodiments of the present invention, the two methods were suitably employed, and final components and their material properties did not suitably differ from each other.

[0040]In other preferred embodiments of the invention, in order to suitably manufacture a high-strength TWIP ...

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Abstract

The present invention features a high-strength and light TWIP steel sheet which can be used to manufacture vehicle body parts, and a method of manufacturing the same.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims under 35 U.S.C. §119(a) priority to Korean Application No 10-2009-0032093, filed on Apr. 14, 2009, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a twinning induced plasticity (TWIP) steel sheet having high strength and high workability and a method of manufacturing the same. In particular embodiments, the present invention relates to a high-strength TWIP steel sheet having excellent yield strength and elongation rate and a method of manufacturing the same.[0004]2. Description of the Related Art[0005]Generally, a high-strength steel sheet that has excellent formability, and which can decrease the weight of a vehicle in order to increase the vehicle fuel efficiency and prevent air pollution, is a requirement in the field of vehicle steel sheets.[0006]In particular, when complicated vehicle bo...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/02C22C38/14C22C38/04C22C38/06B21B45/00
CPCC21D6/005C21D6/02C21D8/0236C21D8/0273C21D2211/004C22C38/14C21D2211/008C22C38/02C22C38/04C22C38/06C21D2211/005C21D8/02C21D9/46
Inventor HONG, SEUNG HYUNKO, SE JIN
Owner HYUNDAI MOTOR CO LTD
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