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:
Oct. 08, 2024
Filed:
Mar. 05, 2019
Arcelormittal, Luxembourg, LU;
Alexandre Blaise, Chantilly, FR;
Pascal Drillet, Rozerieulles, FR;
Thierry Sturel, Le Ban Saint Martin, FR;
ArcelorMittal, Luxembourg, LU;
Abstract
A process for manufacturing a non-stamped prealloyed steel coil, sheet or blank, comprising the following successive steps of: providing a non-stamped precoated steel coil, sheet or blank composed of a steel substrate covered by a precoating of aluminum, or aluminum-based alloy, or aluminum alloy, wherein the precoating thickness is comprised between 10 and 35 micrometers on each side of the steel coil, sheet or blank, then heating the non-stamped steel coil, sheet or blank in a furnace under an atmosphere containing at least 5% oxygen, up to a temperature θcomprised between 750 and 1000° C., for a duration tcomprised between tand t, wherein: t=23500/(θ−729.5) and t=4.946×10×θ, tdesignating the total duration in the furnace, θbeing expressed in ° C. and tand tbeing expressed in seconds, then cooling the non-stamped steel coil, sheet or blank at a cooling rate Vdown to a temperature θ, then maintaining the non-stamped steel coil, sheet or blank at a temperature θcomprised between 100 and 500° C., for a duration tcomprised between 3 and 45 minutes, so to obtain a diffusible hydrogen less than 0.35 ppm.