Title:
LEAF SPRING STEEL SHEET HAVING EXCELLENT FATIGUE LIFE, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/125688
Kind Code:
A1
Abstract:
A leaf spring steel sheet according to one aspect of the present invention comprises, by wt%, 0.7-1.0% of carbon (C), 0.1-0.4% of silicon (Si), 0.2-1.0% of manganese (Mn), 0.05-2.0% of chromium (Cr), 0.07-0.2% of vanadium (V), 0.03% or less of phosphorus (P), 0.03% or less of sulfur (S) and the balance of Fe and inevitable impurities, wherein the steel sheet comprises, as a microstructure, 99 area% or more of pearlite and 1 area% or less (excluding 0%) of vanadium carbide (VC), and the average particle size of prior austenite can be 28 μm or less.
Inventors:
KIM SUN-MI (KR)
Application Number:
PCT/KR2020/017990
Publication Date:
June 24, 2021
Filing Date:
December 10, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/24; B21B1/24; B21B3/00; C21D8/12
Foreign References:
| KR101445868B1 | 2014-10-01 | |||
| KR20100021273A | 2010-02-24 | |||
| JP2007100126A | 2007-04-19 | |||
| JPH08302428A | 1996-11-19 | |||
| KR20180089103A | 2018-08-08 | |||
| CN108265224A | 2018-07-10 | |||
| KR20080060619A | 2008-07-02 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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