Steel for mechanical structure for cold working, and method for producing same
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United States of America
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Feb 25, 2020
Grant Date -
May 11, 2017
app pub date -
Jun 8, 2015
filing date -
Jun 8, 2015
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Abstract
Provided is a steel for a mechanical structure for cold working, which contains C, Si, Mn, P, S, Al and N and in which the metal structure includes pearlite and ferrite, the total areal proportion of pearlite and ferrite relative to the overall structure is 90% or higher, the average circle-equivalent diameter of bcc-Fe crystal grains surrounded by large angle grain boundaries is 5-15 μm, the average aspect ratio of pro-eutectoid ferrite crystal grains is 3.0 or lower, and the average spacing at the narrowest pearlite lamellar spacing is 0.20 μm or less.
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