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Title:
STEEL WIRE FOR MACHINE STRUCTURAL COMPONENT AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/210124
Kind Code:
A1
Abstract:
Provided is a steel wire for a machine structural component, the steel wire containing 0.05 mass% to 0.60 mass% C, 0.005 mass% to 0.50 mass% Si, 0.30 mass% to 1.20 mass% Mn, more than 0 mass% to at most 0.050 mass% P, more than 0 mass% to at most 0.050 mass% S, 0.001 mass% to 0.10 mass% Al, more than 0 mass% to at most 1.5 mass% Cr, and more than 0 mass% to at least 0.02 mass% N, with the remainder comprising iron and unavoidable impurities. The surface area of cementite present at a ferrite crystal grain boundary is at least 32% in relation to the surface area of the cementite as a whole, and, when the amount (mass%) of C in the steel is represented by [C], the average equivalent circle diameter of the cementite as a whole is (1.668 - 2.13[C]) µm to (1.863 - 2.13[C]) µm, inclusive.

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Inventors:
MATSUMOTO YOSUKE
IKEDA KENSHI
KOCHI TAKUYA
SAKATA MASAYUKI
UCHIDA TATSUNORI
YAMASHITA KOJI
INOUE YUTA
Application Number:
PCT/JP2022/013270
Publication Date:
October 06, 2022
Filing Date:
March 22, 2022
Export Citation:
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Assignee:
KOBE STEEL LTD (JP)
International Classes:
C21D8/06; C21D1/32; C21D9/52; C22C38/00; C22C38/60
Domestic Patent References:
WO2016148037A12016-09-22
Foreign References:
JP2000073137A2000-03-07
JP2006225701A2006-08-31
JP2013147728A2013-08-01
JP2015168882A2015-09-28
Attorney, Agent or Firm:
YAMAO, Norihito (JP)
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