KIM, Dong-Hyun,LEE, You-Hwan,LEE, Sang-Yoon,CHO, Hyung-Keun
申请号：
EP20100841192
公开号：
EP2519654(A4)
申请日:
2010.12.23
申请国别(地区):
欧洲专利局
年份:
2017
代理人:
摘要：
An ultra-high-strength steel wire rod having excellent resistance to delayed fracture includes, by wt %, 0.7-1.2% C, 0.25-0.5% Si, 0.5-0.8% Mn, 0.02-0.1% V and a balance of Fe and inevitable impurities. The method includes the steps of heating the above steel composition to 1100° C. or lower and hot rolling at a temperature of 900-1000° C., followed by cooling to 600-650° C. at a prescribed rate, followed by cold drawing at a reduction ratio of 60-80%.
