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Title:
WIRE ROD AND STEEL WIRE FOR SPRING, SPRING, HAVING IMPROVED FATIGUE RESISTANCE AND NITRIFICATION PROPERTIES, AND METHODS FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/131592
Kind Code:
A1
Abstract:
Disclosed are a wire rod and a steel wire for a spring, a spring, having improved fatigue resistance and nitrification treatment properties, and methods for manufacturing same. The wire rod for a spring, having improved fatigue resistance and nitrification treatment characteristics, according to the present invention comprises, in wt%: 0.6 to 0.7% of C; 2.0 to 2.5% of Si; 0.2 to 0.5% of Mn; 0.9 to 1.6% of Cr; 0.015% or less of P; 0.01% or less of S; 0.01% or less of Al; 0.007% or less of N; 0.1 to 0.25% of Mo; 0.1 to 0.25% of V; and the balance of Fe and inevitable impurities, wherein Cr+Mn is 1.8% or less, Mo/V is 1.5 or less, and the microstructure includes a pearlite structure of 60% or more in the C section.

Inventors:
LEE JUNMO (KR)
CHOI SEOK-HWAN (KR)
CHOI MYUNGSOO (KR)
Application Number:
PCT/KR2021/016990
Publication Date:
June 23, 2022
Filing Date:
November 18, 2021
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
C22C38/34; B21F3/02; B21F35/00; C21D8/06; C21D9/52; C22C38/22; C22C38/24; F16F1/04
Foreign References:
KR20120040728A2012-04-27
KR101096888B12011-12-22
KR20180019212A2018-02-23
US20090283181A12009-11-19
JP2004315968A2004-11-11
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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