The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 2022
Filed:
Dec. 08, 2017
Arcelormittal, Luxembourg, LU;
Alexandre Blaise, Montataire, FR;
ArcelorMittal, Luxembourg, LU;
Abstract
A manufacturing process of a press hardened coated part including providing a furnace containing N zones, each furnace zone being respectively heated at a setting temperature Θ, Θ, . . . Θ, . . . , Θ, including: providing a steel sheet with thickness th between 0.5 and 5 mm, the steel sheet covered by an aluminium alloy precoating with a thickness between 15 and 50 μm, the emissivity coefficient being equal to 0.15(1+α), α being between 0 and 2.4, then cutting the steel sheet to obtain a precoated steel blank, then placing the precoated steel blank in furnace zone 1 for a duration tbetween 5 and 600 s, wherein Θand tare such that: Θ>Θ>Θthen transferring the precoated steel blank in the furnace zone 2 heated at a setting temperature Θ=Θand maintaining isothermally the precoated steel blank for a duration t, then transferring the precoated steel blank in further zones (3, . . . i, . . . , N) of the furnace, so to reach a maximum blank temperature Θbetween 850° C. and 950° C., the average heating rate Vof the blank between Θand Θbeing between 5 and 500° C./s, then hot forming the heated steel blank so as to obtain a part, then cooling the part to obtain martensite or bainite.