Fabrication process of coated stamped parts

US10131117B2 · kind B2 · utility

Assignee

• ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO, S.L. · ES

Inventors

• Isabelle Thirion · Hagondange, FR
• Thomas Vietoris · Berlin, DE
• Raisa Grigorieva · Metz, FR
• Pascal Drillet · Rozérieulles, FR
• Ludwig Schaller · Ingolstadt, DE
• Karl Michael Bader · Ingolstadt, DE
• Uwe Paar · Kassel, DE
• Michael Alsmann · Kassel, DE

Key dates

• Filing date: Feb 1, 2010
• Grant date: Nov 20, 2018
• Expiry date: Mar 13, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/25
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature Ti comprised between Te−10° C. and Te, Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature Ti up to a temperature Tm comprised between 840 and 950° C. under non protective atmosphere with a heating rate V comprised between 30° C./s and 90° C./s, V being the heating rate between the temperature Ti and the temperature Tm, in order to obtain a coated heated blank, then soaking the coated heated blank at said temperature Tm for a time tm comprised between 20 s and 90 s, then hot stamping the blank in order to obtain a hot stamped coated part, then cooling said stamped part at a cooling rate in order to form a microstructure in the steel substrate…