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Method for manufacturing high-strength cold-rolled/hot-rolled DP steel having a tensile strength grade of 590 MPa and excellent workability, as well as little deviation in the material properties thereof

A technology with excellent workability and tensile strength, applied in the direction of manufacturing tools, heat treatment furnaces, metal rolling, etc., can solve the problems of cold-rolled DP steel without proposed mechanical properties, achieve excellent workability, improve recyclability, Excellent workability

Inactive Publication Date: 2013-08-07
POHANG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as disclosed in European Patent No. 2020294, Unexamined Japanese Patent Publication Nos. 2000-63955 and 2000-63956, and PCT Publication No. WO00 / 055381, these inventions mainly relate to methods of manufacturing hot-rolled DP steel , these methods include the process of performing cooling technology after hot rolling until coiling, and do not propose a method for manufacturing cold-rolled DP steel with high mechanical properties using a micro-rolling mill process

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  • Method for manufacturing high-strength cold-rolled/hot-rolled DP steel having a tensile strength grade of 590 MPa and excellent workability, as well as little deviation in the material properties thereof
  • Method for manufacturing high-strength cold-rolled/hot-rolled DP steel having a tensile strength grade of 590 MPa and excellent workability, as well as little deviation in the material properties thereof
  • Method for manufacturing high-strength cold-rolled/hot-rolled DP steel having a tensile strength grade of 590 MPa and excellent workability, as well as little deviation in the material properties thereof

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[0031] Hereinafter, a detailed description of the present invention will be given.

[0032] As stated above, the present invention pertains to a method of manufacturing high-strength cold-rolled DP steel using a micro-mill process using thin-slab casting technology, cf. figure 1 The micro-rolling mill process according to the present invention will be briefly described. The hot-rolled steel strip produced by the micro-mill process is subjected to known cold-rolling processes (pickling, cold rolling, continuous annealing, cooling heat treatment) to thereby obtain the final cold-rolled DP steel, the description of which is omitted.

[0033] Specifically, a thin slab (a) having a thickness of 30 mm to 150 mm is produced by the continuous casting machine 10 . The slab is thin compared to a slab having a thickness of 200 mm or more produced by a continuous casting machine using a conventional rolling mill, and thus is called a thin slab. Since a conventional slab having a thickne...

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Abstract

An object of the present invention is to provide a method for manufacturing high-strength cold-rolled / hot-rolled DP steel having a tensile strength grade of 590 MPa and excellent workability, as well as little deviation in the material properties thereof, wherein said excellent workability can be achieved using thin-slab continuous casting, and deviations in the material properties in the widthwise and lengthwise directions of a strip can be significantly reduced.

Description

technical field [0001] The present invention relates to a method for manufacturing high-strength cold-rolled / hot-rolled DP steel with a tensile strength grade of 590 MPa, excellent machinability, and small deviations in mechanical properties, and more particularly, to a method of using thin slab casting technology A method for manufacturing high-strength cold-rolled / hot-rolled DP steel with excellent elongation and small deviation in mechanical properties. Background technique [0002] Recently, with the need to increase the fuel efficiency of motor vehicles and to strengthen safety regulations for drivers and passengers in the motor vehicle industry, there is an ongoing search for lightweight, high-strength motor vehicle bodies that can provide improved crash resistance. Fully researched. [0003] Therefore, in order to satisfy both light-weight characteristics and high-strength characteristics of automobiles, high-strength steel sheets of 590 MPa class or higher have been...

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Application Information

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IPC IPC(8): C21D8/02C22C38/00C22C38/58C22C38/06C21D9/46B21B3/02
CPCC21D9/46C22C38/02C22C38/22C22C38/60B21B3/02C22C38/26C22C38/06C22C38/28C21D8/0215C22C38/001C22C38/32C22C38/38C22C38/24
Inventor 康熙宰韩台教成焕球
Owner POHANG IRON & STEEL CO LTD
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