STEEL COMPONENT AND METHOD OF PRODUCING SAME

Abstract: a method to achieve a yield ratio of 0.60 or more in a component from non-heat-treated steel having bainitic microstructure. the component includes a predetermined chemical composition, in mass %, in amounts such that a value of f1 obtained by formula (1) is 0.65% or more, with the balance as fe and inevitable impurity. bainitic microstructure area fraction is 85% or more and retained austenite area fraction is 5% or less. crystal grains of the bainitic microstructure have an average diameter of 10 �m or more and 25 �m or less, an average aspect ratio of 0.5 or more, and an average ratio of crystal grain boundary length to crystal grain circumference of 60 or less.

Inventor(s): Masafumi TADA, Kazuaki FUKUOKA

CPC Classification: C22C38/38 (ALLOYS (flints ; treatment of alloys , ))

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