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1. (WO2010123315) HIGH STRENGTH, HIGH TOUGHNESS STEEL WIRE ROD, AND METHOD FOR MANUFACTURING SAME

Pub. No.:    WO/2010/123315    International Application No.:    PCT/KR2010/002568
Publication Date: Fri Oct 29 01:59:59 CEST 2010 International Filing Date: Sat Apr 24 01:59:59 CEST 2010
IPC: C22C 38/00
C21D 8/06
B21B 1/16
Applicants: POSCO
주식회사 포스코
KIM, Dong-Hyun
김동현
LEE, You-Hwan
이유환
LEE, Sang-Yoon
이상윤
CHO, Hyung-Keun
조형근
Inventors: KIM, Dong-Hyun
김동현
LEE, You-Hwan
이유환
LEE, Sang-Yoon
이상윤
CHO, Hyung-Keun
조형근
Title: HIGH STRENGTH, HIGH TOUGHNESS STEEL WIRE ROD, AND METHOD FOR MANUFACTURING SAME
Abstract:
The present invention relates to a high strength, high toughness steel wire rod and to a method for manufacturing same, and more particularly, to a high strength, high toughness steel wire rod useful in cold heading, etc., which not only uses less alloy elements and has an excellent dimensional accuracy compared to quenched and tempered steel wire rods produced by conventional heat treatment processes, but can also be manufactured by a simple method as compared to conventional steel wire rods that are not quenched and tempered. The steel wire rod of the present invention has a composition including nitrogen such that Al may be present in an amount of 0.07 to 0.14 wt % and the ratio of Al:N (i.e., the wt % of each element) can be 15:1 to 25:1. According to the present invention, a steel wire rod which has strength and toughness enhancing effects sufficient for a simple alloy component system can be obtained, and thus, a steel wire rod can be provided through processing by cold heading, etc. without additional heat treatment.