Quenched steel pipe member, vehicle axle beam using quenched steel pipe member, and method for manufacturing quenched steel pipe member
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United States of America Patent
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Jul 11, 2017
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N/A
app pub date -
Sep 12, 2013
filing date -
Sep 20, 2012
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Abstract
A quenched steel pipe member is formed of a GI galvanized steel pipe, in a middle section in a longitudinal direction of the GI galvanized steel pipe, a cross-section perpendicular to the longitudinal direction has a substantially V shape including a contact section at which opposite parts of an inner circumferential surface of the GI galvanized steel pipe come into contact with each other, the contact section is bonded using a Fe—Zn alloy phase, and a micro Vickers hardness at a location 50 μm deep from a base material surface layer is 95% or more of a micro Vickers hardness at a location 200 μm deep from the base material surface layer.
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