Steel wire rod having excellent cold heading quality and hydrogen delayed fracture resistance, method of manufacturing the same, and mehod of manufacturing bolt using the same

a technology of cold heading and cold heading, which is applied in the field of steel wire rods used for bolts, can solve the problems of increasing production costs, deteriorating cold heading quality, and reducing the life of cold headings, and achieve excellent cold heading quality, excellent hydrogen delayed fracture resistance, and high strength.
US20120128524A1Inactive Publication Date: 2012-05-24POSTECH ACAD IND FOUND
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Patent Information

Authority / Receiving Office
US Ā· United States
Current Assignee / Owner
POSTECH ACAD IND FOUND
Publication Date
2012-05-24
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

Provided are a high-strength, high-manganese steel wire rod having excellent cold heading quality and not requiring spheroidizing and quenching-tempering treatments during manufacturing a bolt and a method of manufacturing a bolt using the steel wire rod. The method of manufacturing a steel wire rod includes heating a steel containing 12 to 25 wt % of Mn within a temperature range of 1100Ā° C. to 1250Ā° C., hot rolling the heated steel within a temperature range of 700Ā° C. to 1100Ā° C., and cooling the hot rolled steel to a temperature of 200Ā° C. or less and cold caliber rolling or drawing to manufacture a steel wire rod.
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Description

CROSS REFERENCE

[0001] This application claims foreign priority under Paris Convention and 35 U.S.C. Ā§119 to Korean Patent Application Nos. 10-2010-0116350, filed 22 Nov. 2010, and 10-2011-0022061 filed 11 Mar. 2011, with the Korean Intellectual Property Office.BACKGROUND OF THE INVENTION

[0002] 1. Technical Field

[0003] The present invention relates to a steel wire rod used for a bolt, and more particularly, to a high-strength, high-manganese steel wire rod, which has excellent cold heading quality and hydrogen delayed fracture resistance and is enabled to skip spheriodizing and quenching-tempering heat treatment processes, a method of manufacturing the same, and a method of manufacturing a bolt using the same.

[0004] 2. Description of the Related Art

[0005] There is a trend towards continuously increased demand for a high-strength wire rod in order to achieve energy efficiency increase and energy consumption decrease. For example, when bolts used in an automobile engine are replaced by high...

Claims

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