Title:
SULFUR-ADDED GRAPHITE STEEL WIRE ROD, STEEL WIRE AND GRAPHITE STEEL, WHICH HAVE EXCELLENT CUTTING PERFORMANCE, AND MANUFACTURING METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/063678
Kind Code:
A1
Abstract:
The present invention relates to a graphite steel wire rod, steel wire and graphite steel, which have excellent cutting performance, and manufacturing methods therefor, and, more specifically, to: a graphite steel wire rod, steel wire and graphite steel to which sulfur is added and which have cutting performance superior to that of normal free-cutting steel; and manufacturing methods therefor. Specifically, the present invention relates to a graphite steel wire rod and steel wire, and manufacturing methods therefor, the rod and the wire comprising, by wt%, 0.60-0.90% of carbon (C), 2.0-2.5% of silicon (Si), 0.1-0.6% of manganese (Mn), 0.015% or less of phosphorus (P) (excluding 0), 0.031-0.3% of sulfur (S), 0.01-0.05% of aluminum (Al), 0.005-0.02% of titanium (Ti), 0.0005-0.0020% of boron (B), 0.0030-0.0150% of nitrogen (N), and the balance of Fe and inevitable impurities. In addition, the present invention relates to graphite steel and a manufacturing method therefor, the steel comprising, by wt%, 0.60-0.90% of carbon (C), 2.0-2.5% of silicon (Si), 0.1-0.6% of manganese (Mn), 0.015% or less of phosphorus (P) (excluding 0), 0.031-0.3% of sulfur (S), 0.01-0.05% of aluminum (Al), 0.005-0.02% of titanium (Ti), 0.0005-0.0020% of boron (B), 0.0030-0.0150% of nitrogen (N), and the balance of Fe and inevitable impurities, having, as a microstructure, graphite grains distributed in a ferrite matrix, having a degree of graphitization of 95% or more, and containing 5% or less of MnS inclusions and pearlite in total.
Inventors:
CHOI SANGWOO (KR)
Application Number:
PCT/KR2022/015274
Publication Date:
April 20, 2023
Filing Date:
October 11, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/02; B21C23/08; C21D9/52; C22C38/00; C22C38/04; C22C38/06; C22C38/14; C22C38/60
Foreign References:
| JPH11131187A | 1999-05-18 | |||
| KR102224044B1 | 2021-03-09 | |||
| KR100349008B1 | 2002-08-17 | |||
| JPH11350066A | 1999-12-21 | |||
| EP2530177A1 | 2012-12-05 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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