Steel H-shape for low temperature service and manufacturing method therefor
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United States of America Patent
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Jan 26, 2021
Grant Date -
Feb 14, 2019
app pub date -
Mar 2, 2017
filing date -
Mar 2, 2016
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Abstract
Provided is a steel H-shape for low temperature service including a predetermined chemical composition. A CEV obtained by CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 is 0.40 or less. A sum of an area ratio of one or both of ferrite and bainite at a 1/4 position from an outer side across a thickness of a flange and a 1/6 position from an outer side across a flange width is 90% or more, and an area ratio of a hard phase is 10% or less. An effective grain size is 20.0 μm or less, and a grain size of the hard phase is 10.0 μm or less. 30 pieces/mm2 or more Ti oxides having an equivalent circle diameter ranging from 0.01 to 3.0 μm are included. The thickness of the flange ranges from 12 to 50 mm.
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