STEEL WIRE FOR MACHINE STRUCTURAL PARTS AND METHOD FOR MANUFACTURING THE SAME
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United States of America Patent
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Issued Date -
May 30, 2024
app pub date -
Mar 22, 2022
filing date -
Mar 31, 2021
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Abstract
A steel wire for machine structural parts, including respective predetermined contents of C, Si, Mn, P, S, Al, Cr, N, and iron, wherein when a total content of Cr and Mn (% by mass) in cementite in the metallurgical microstructure is expressed as {Cr+Mn}, a total content of Cr and Mn (% by mass) in steel is expressed as [Cr+Mn], and a C content (% by mass) of the steel is expressed as [C], a concentration ratio {Cr+Mn}/[Cr+Mn] is (0.5[C] +0.040) or more, and an average circular-equivalent diameter of all the cementite is (1.668-2.13[C]) μm or more and (1.863-2.13[C]) μm or less.
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