H-Section steel
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United States of America Patent
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Nov 1, 2016
Grant Date -
Jul 23, 2015
app pub date -
Nov 13, 2013
filing date -
Nov 26, 2012
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Abstract
There is provided an H-section steel in which a number density of oxide particles having an equivalent circle diameter of 0.005 μm to 2.0 μm per unit area is 100 pieces/mm2 to 5000 pieces/mm2, the oxide particles includes Ca, Al, and O as a composition, the amount of Ca is 5% or more, the amount of Al is 5% or more, and a total amount of Ca and Al is 50% or more by mass ratio excluding O in the oxide particles, a thickness of the flange is 100 mm to 150 mm, a bainite fraction in a metallographic structure of the flange is 80% or more at a strength evaluation position, and an average prior austenite grain size in the metallographic structure of the flange is 200 μm or less at a toughness evaluation position.
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