Title:
MANUFACTURING PROCESS OF PRESS HARDENED PART WITH HIGH PRODUCTIVITY
Document Type and Number:
Japanese Patent JP2023099167
Kind Code:
A
Abstract:
To provide a non-stamped pre-alloyed steel coil, sheet or blank.SOLUTION: A non-stamped pre-alloyed steel coil, sheet or blank includes a heat-treatable steel substrate covered by an alloyed precoating containing aluminum and iron, aluminum not being present as free aluminum. The non-stamped pre-alloyed steel coil, sheet or blank contains an interdiffusion layer at the interface between the steel substrate and the precoating, with a thickness included between 2 and 16 micrometers. The interdiffusion layer is a layer with an α(Fe) ferritic structure, having Al and Si in solid solution, and an alumina-containing oxide layer atop the alloyed precoating, with a thickness higher than 0.10 μm. Diffusible hydrogen in the non-stamped pre-alloyed steel coil, sheet or blank is less than 0.25 ppm.SELECTED DRAWING: None
Inventors:
ALEXANDRE BLAISE
PASCAL DRILLET
THIERRY STUREL
PASCAL DRILLET
THIERRY STUREL
Application Number:
JP2023075990A
Publication Date:
July 11, 2023
Filing Date:
May 02, 2023
Export Citation:
Assignee:
ARCELORMITTAL
International Classes:
C21D9/00; C21D1/18; C21D3/06; C22C21/02; C22C38/00; C22C38/14; C22C38/60; C23C2/12; C23C2/28
Attorney, Agent or Firm:
Kawaguchi International Patent Office