Hot Rolled Steel Sheet

Abstract: This hot-rolled steel sheet has a desired chemical composition and has a metal structure which contains, in terms of area%, at least 10% of bainite, at least 10% of tempered martensite, a total of 70-96% of bainite and tempered martensite, at most 20% of fresh martensite, 4-12% of retained austenite, at most 5% of ferrite, and at most 5% of pearlite, and in which: the average grain diameter of prior austenite grains is at most 20.0 µm; the average aspect ratio of prior austenite grains is at most 3.00; and the area ratio of an aggregate of fresh martensite having a major diameter of at least 30 µm and retained austenite is at most 5%.

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