Steel for mechanical structure for cold working, and method for manufacturing same
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United States of America Patent
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Feb 13, 2018
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app pub date -
Dec 11, 2012
filing date -
Dec 19, 2011
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Abstract
Provided are a steel for a mechanical structure for cold working, and a method for manufacturing the same, whereby softening and variations in hardness can be reduced even when a conventional spheroidizing annealing process is performed. A steel having a predetermined chemical composition, the total area ratio of pearlite and pro-eutectoid ferrite being at least 90 area % with respect to the total metallographic structure of the steel, the area ratio (A) of pro-eutectoid ferrite satisfying the relationship A>Ae with an Ae value expressed by a predetermined relational expression, the average equivalent circular diameter of bcc-Fe crystal grains being 15-35 μm, and the average of the maximum grain diameter and the second largest grain diameter of the bcc-Fe crystal grains being 50 μm or less in terms of equivalent circular diameter.
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