High-strength H-beam steel exhibiting excellent low-temperature toughness and method of manufacturing same
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United States of America Patent
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May 9, 2017
Grant Date -
Oct 9, 2014
app pub date -
Dec 12, 2012
filing date -
Dec 15, 2011
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Abstract
This H-beam steel contains, in mass %, C, Si, Mn, Al, Ti, N, O, Nb, and B. The H-beam steel has composition in which the amount of Nb and the amount of B satisfy, in mass %, 0.070≦Nb+125B≦0.155, and has a metal structure in which, in a microstructure, an area fraction of bainite is not less than 70%, a total of an area fraction of pearlite and an area fraction of cementite is not more than 15%, and the remainder is at least one of ferrite and island martensite. The effective crystalline-grain size of the bainite is not more than 40 μm, and the thickness of a flange falls in a range of 12 to 40 mm.
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