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US 2020/0109459 A1Published application
Vehicle underbody part material, method for manufacturing vehicle underbody part material, and method for manufacturing vehicle underbody part
AssigneeNippon Steel Corporation
InventorToyomitsu NAKAMURA
Life of this patent
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Abstract
To provide a technique capable of preventing or suppressing fatigue failure of a vehicle underbody part material by 3DQ. A vehicle underbody part material relating to this disclosure includes: a quenched and bent steel pipe; and a plating film layer provided on a surface of the steel pipe and containing 30 mass % or more of Al and having an Al—Fe alloy existing in a surface thereof.
Claims15
A vehicle underbody part material comprising:
- a quenched and bent steel pipe;
- and
- a plating film layer provided on a surface of the steel pipe and containing 30 mass % or more of Al and having an Al—Fe alloy existing in a surface thereof.
A method for manufacturing a vehicle underbody part material comprising:
- heating a part of a steel pipe comprising a plating film layer containing 30 mass % or more of Al in a surface thereof at an average temperature increasing rate of 100° C./sec or more from 100° C. to a maximum heating temperature in a range of 850 to 1300° C.;
- bending a part of the steel pipe having reached the maximum heating temperature;
- and
- cooling the part of the steel pipe at an average cooling rate of 1000° C./sec or more and to an ultimate temperature of 350° C. or lower within two seconds after the part of the steel pipe has reached the maximum heating temperature.
1 more element
Dependencies are inferred from the claim text.