Manufacturing process of press hardened parts with high productivity
US12110572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2019 |
| Grant date | Oct 8, 2024 |
| Priority date | — |
| Expiry date | Dec 13, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/25
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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 θ1 comprised between 750 and 1000° C., for a duration t1 comprised between t1min and t1max, wherein: t1min=23500/(θ1−729.5) and t1max=4.946×1041×θ1−13.08, t1 designating the total duration in the furnace, θ1 being expressed in ° C. and t1min and t1max being expressed in seconds, then cooling the non-stamped steel coil, sheet or blank at a cooling rate Vr1 down to a temperature θi, then maintaining the non-stamped steel coil, sheet or blank at a temperature θ2 comprised between 100 and 500° C., for a duration t2 comprised between 3 and 45 minutes, so to obtain a diffusible hydrogen less than 0.35 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.