Title:
WIRE ROD FOR GRAPHITIZATION HEAT TREATMENT, GRAPHITE STEEL, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/149849
Kind Code:
A1
Abstract:
Disclosed in the present specification are graphite steel capable of being utilized as a material for mechanical parts of industrial machinery, automobiles, or the like and, specifically, a wire rod for graphitization heat treatment, graphite steel, and a manufacturing method therefor. According to an embodiment of the disclosed graphite steel, the graphite steel contains, in wt%, 0.6-0.9% of carbon (C), 2.0-2.5% of silicon (Si), 0.1-0.6% of manganese (Mn), 0.015% or less of phosphorus (P), 0.03% or less of sulfur (S), 0.01-0.05% of aluminum (Al), 0.01-0.02% of titanium (Ti), 0.0005-0.002% of boron (B), 0.003-0.015% of nitrogen (N), 0.005% or less of oxygen (O), and the balance being Fe and inevitable impurities, wherein the graphite steel satisfies expression (1) below, has a microstructure in which graphite grains are distributed in the ferrite matrix, and shows a rate of graphitization of 100%. (1) -0.003 < [N] - [Ti]/3.43 - [B]/0.77 < 0.003, wherein [Ti], [N], and [B] represent the weight percentages of titanium, nitrogen, and boron, respectively.
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Inventors:
LIM NAM-SUK (KR)
PARK IN-GYU (KR)
MIN SE HONG (KR)
LEE SEON-GU (KR)
PARK IN-GYU (KR)
MIN SE HONG (KR)
LEE SEON-GU (KR)
Application Number:
PCT/KR2020/001133
Publication Date:
July 29, 2021
Filing Date:
January 22, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/02; B21B1/16; B21B3/00; B21C1/02; C21D8/06; C22C38/00; C22C38/04; C22C38/06; C22C38/14
Foreign References:
| JPH11131187A | 1999-05-18 | |||
| KR100605723B1 | 2006-08-01 | |||
| JPH11350067A | 1999-12-21 | |||
| US6419761B1 | 2002-07-16 | |||
| KR100605722B1 | 2006-08-01 |
Other References:
See also references of EP 3964599A4
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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