公开(公告)号：US11162153B2

公开(公告)日：2021-11-02

申请号：US15748395

申请日：2016-07-11

Applicant: ARCELORMITTAL

Inventor： Tiago Machado Amorim ,  Christian Allely ,  Raisa Grigorieva ,  David Dussaussois

IPC: C21D9/46 ,  C22C21/10 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  B32B15/01 ,  C21D8/00 ,  C21D6/00 ,  B21D22/02 ,  C23C2/26 ,  C21D1/673 ,  C22C21/02

Abstract: The present invention provides a method for the manufacture of a hardened part. The method includes the provision of a steel sheet pre-coated with a metallic coating including from 2.0 to 24.0% by weight of zinc, from 1.1 to 7.0% by weight of silicon, optionally from 1.1 to 8.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and unavoidable impurities and residuals elements, wherein the ratio Al/Zn is above 2.9. The method further includes the cutting of the coated steel sheet to obtain a blank, the thermal treatment of the blank at a temperature between 840 and 950° C. to obtain a fully austenitic microstructure in the steel, the transfer of the blank into a press tool, the hot-forming of the blank to obtain a part, the cooling of the part in order to obtain a microstructure in steel being martensitic or martensitic-bainitic or made of at least 75% of equiaxed ferrite, from 5 to 20% of martensite and bainite in amount less than or equal to 10%.

公开(公告)号：US20250003046A1

公开(公告)日：2025-01-02

申请号：US18800464

申请日：2024-08-12

Applicant: ArcelorMittal

Inventor： Clément PHILIPPOT ,  Doriane Serra ,  Hubert Salmon Legagneur ,  David Dussaussois

IPC: C23C2/12 ,  B21D22/02 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40

Abstract: A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer. the total thickness of the coating ecoating and the thickness of the interdiffusion layer eIDL satisfy the following condition: 1 ⁢ 6 ≤ E pc