Title:
WIRE ROD FOR HIGH STRENGTH COLD HEAD QUALITY STEEL WITH EXCELLENT RESISTANCE TO HYDROGEN EMBRITTLEMENT, AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/125793
Kind Code:
A1
Abstract:
Provided are a wire rod for high strength cold head quality steel with excellent resistance to hydrogen embrittlement, and a manufacturing method thereof. The wire rod for high strength cold head quality steel of the present invention, comprises, in percentage by weight: C: 0.3-0.5%; Si: 0.01-0.3%; Mn: 0.3-1.0%; Cr: 0.5-1.5%; Mo: 0.5-1.5%; V: 0.01-0.4%; and the balance consisting of Fe and other impurities, has a chemical composition that satisfies relational equation 1, has a microstructure including, in percentage by area: martensite: 1-15%; pearlite: 0.1-5% pearlite; and the balance consisting of bainite, wherein among the martensite, the proportion of martensite formed in grain boundaries of prior austenite is 60% or more.
Inventors:
JUNG BYUNG-IN (KR)
Application Number:
PCT/KR2020/018459
Publication Date:
June 24, 2021
Filing Date:
December 16, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/22; C21D8/02; C21D9/68; C22C38/24
Foreign References:
| JPH07300651A | 1995-11-14 | |||
| JPH0978193A | 1997-03-25 | |||
| KR20010060772A | 2001-07-07 | |||
| JPH07268545A | 1995-10-17 | |||
| KR20190074779A | 2019-06-28 |
Other References:
See also references of EP 4079907A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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