H-section steel and method of producing the same
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United States of America Patent
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Aug 28, 2018
Grant Date -
Dec 29, 2016
app pub date -
Dec 5, 2014
filing date -
Dec 16, 2013
priority date (Note) -
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Abstract
An H-section steel has a predetermined chemical composition in which Ti oxides having a grain size of 0.01 μm to 3.0 μm are included at a density of 30 pieces/mm2 or more, a thickness of a flange is 100 mm to 150 mm, an area fraction of bainite at a ⅙ position from a surface of the flange in a length direction and at a ¼ position from the surface thereof in a thickness direction is 80% or more, a yield strength or 0.2% proof stress is 450 MPa or more, and a tensile strength is 550 MPa or more, a Charpy absorbed energy at 21° C. at a ½ position from the surface of the flange in the length direction and at a ¾ position from the surface thereof in the thickness direction is 100 J or more, and an average austenite grain size is 50 μm to 200 μm.
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