High strength steel pipe for reinforcing door of car
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United States of America Patent
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Jan 19, 1993
Grant Date -
N/A
app pub date -
Sep 18, 1991
filing date -
Sep 20, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Herein described is a high strength steel pipe for reinforcing doors of a car, comprising a steel pipe made by seam-welding a steel sheet, wherein a ratio (Hv.sub.1 /Hv.sub.2) of a minimum hardness in a softened area of a weld affected zone to an average hardness in a base material satisfies the following formula, -0.001.sigma.B+1.05.gtoreq.Hv.sub.1 /Hv.sub.2 .gtoreq.-0.003.sigma.B+1.05 wherein .sigma.B: tensile strength (kgf/mm.sup.2) and Hv.sub.1, Hv.sub.2 : Vickers hardness and a ratio (.sigma.y/.sigma.B) of a yield strength .sigma.y to a tensile strength .sigma.B of a steel pipe is 0.7 or more.
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