公开(公告)号：US20250019787A1

公开(公告)日：2025-01-16

申请号：US18715947

申请日：2021-12-10

Applicant: ArcelorMittal

Inventor： Xavier GARAT ,  Pascal LORENZINI

IPC: C21D9/46 ,  B32B15/01 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06

Abstract: A low density hot rolled steel including of 0.12%≤carbon≤0.25%, 3%≤manganese≤10%, 3.5%≤aluminum≤6.5%, 0%≤phosphorus≤0.1%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.1%, 0%≤silicon≤2%, 0.01%≤niobium≤0.03%, 0.01%≤titanium≤0.2%, 0%≤molybdenum≤0.5%, 0%≤chromium≤0.6%, 0.01%≤copper≤2.0%, 0.01%≤nickel≤3.0%, 0%≤calcium≤0.005%, 0%≤boron≤0.01%, 0%≤Magnesium≤0.005%, 0%≤Zirconium≤0.005%, 0%≤Cerium≤0.1%, and the balance including iron and unavoidable impurities, the steel sheet having a microstructure including of ferrite from 60% to 80%, 10% to 35% kappa carbides (Fe,Mn)3AlCx, where x is lower than or equal to 1 and austenite from 0% to 10% wherein the microstructure grains having less than 4 GPa nano-hardness must be more than 45% and microstructure grains having nano-hardness of more than 5 GPa must be less than 10%.

公开(公告)号：US20240052465A1

公开(公告)日：2024-02-15

申请号：US18265316

申请日：2020-12-10

Applicant: ArcelorMittal

Inventor： Pascal LORENZINI ,  Xavier GARAT

IPC: C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C21D8/02 ,  C21D8/00

CPC classification number: C22C38/04 ,  C22C38/06 ,  C22C38/001 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/005 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/004

Abstract: A low density cold rolled and annealed steel sheet having 0.12%≤carbon≤0.25%, 3%≤manganese≤10%, 3.5%≤aluminum≤6.5%, 0%≤phosphorus≤0.1%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.1%, 0%≤silicon≤2%, 0.01%≤niobium≤0.03%, 0.01%≤titanium≤0.2%, 0%≤molybdenum≤0.5%, 0%≤chromium≤0.6%, 0.01%≤copper≤2.0%, 0.01%≤nickel≤3.0%, 0%≤calcium≤0.005%, 0%≤boron≤0.01%, 0%≤Magnesium≤0.005%, 0%≤Zirconium≤0.005%, 0%≤Cerium≤0.1%, and the balance including iron, the steel sheet having a microstructure comprising 60% to 90% Delta ferrite, 8% to 30% of residual austenite having average grain size between 0.6 and 2 microns, 1.0% to 10% of alpha-ferrite having average grain size between 0.6 and 2 microns and 0% to 2% of kappa precipitates (Fe,Mn)3AlCx, where x is strictly lower than 1.

公开(公告)号：US20220340992A1

公开(公告)日：2022-10-27

申请号：US17783114

申请日：2020-12-10

Applicant: ArcelorMittal

Inventor： Pascal LORENZINI

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/26 ,  C22C38/38 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00

Abstract: A heat treated cold rolled steel sheet having a composition comprising of the following elements, 0.1%≤Carbon≤0.25, 2.15%≤Manganese≤3.0%, 1%≤Silicon≤0.8%, 0.1%≤Aluminum≤0.9%, 0.05%≤Chromium≤0.5%, 0%≤, Phosphorus≤0.09%, 0%≤Sulfur≤0.09%, 0%≤Nitrogen≤0.09%, 2.4%≤C+Mn≤3%, 0%≤Niobium≤0.1%, 0% ≤Titanium≤0.1%, 0%≤Vanadium≤0.1%, 0%≤Molybdenum≤1%, 0%≤Nickel≤1%, 0%≤Calcium≤0.005%, 0%≤Boron≤0.01%, 0%≤Cerium≤0.1%, 0%≤Magnesium≤0.05%, 0%≤Zirconium≤0.05% the remainder being composed of iron and unavoidable impurities, the microstructure of said steel sheet including, 20% to 70% Martensite, 5 to 60% of Inter-critical Ferrite, 5 to 30% of Transformed Ferrite, 8% to 20% of Residual Austenite and 1 to 20% Bainite, wherein the cumulated amount of Inter-critical and Transformed Ferrite is between 15% and 65%.

公开(公告)号：US20250019807A1

公开(公告)日：2025-01-16

申请号：US18715957

申请日：2021-12-10

Applicant: ArcelorMittal

Inventor： Xavier GARAT ,  Pascal LORENZINI

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/06

Abstract: A low density hot rolled steel including of 0.12%≤carbon≤0.25%, 3%≤manganese≤10%, 3.5%≤aluminum≤6.5%, 0%≤phosphorus≤0.1%, 0%≤sulfur≤0.03%, 0%≤nitrogen≤0.1%, 0%≤silicon≤2%, 0.01%≤niobium≤0.03%, 0.01%≤titanium≤0.2%, 0%≤molybdenum≤0.5%, 0%≤chromium≤0.6%, 0.01%≤copper≤2.0%, 0.01%≤ nickel≤3.0%, 0%≤calcium≤0.005%, 0%≤boron≤0.01%, 0%≤Magnesium≤0.005%, 0%≤Zirconium≤0.005%, 0%≤Cerium≤0.1%, and the balance including iron and unavoidable impurities, the steel sheet having a microstructure including of ferrite from 55% to 80%, 15% to 50% austenite and martensite from 0% to 10% wherein the microstructure grains having less than 4 GPa nano-hardness must be more than 45% and microstructure grains having nano-hardness of more than 5 GPa must be less than 22%.

公开(公告)号：US20220325369A1

公开(公告)日：2022-10-13

申请号：US17616114

申请日：2020-04-02

Applicant: ArcelorMittal

Inventor： Pascal LORENZINI

IPC: C21D9/46 ,  C22C38/38 ,  C22C38/26 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00

Abstract: A cold rolled and coated steel sheet having a composition including of the following elements, 0.12%≤Carbon≤0.2%, 1.7%≤Manganese≤2.10%, 0.1%≤Silicon≤0.5%, 0.1%≤Aluminum≤0.8%, 0.1%≤Chromium≤0.5%, 0%≤Phosphorus≤0.09%, 0%≤Sulfur≤0.09%, 0%≤Nitrogen≤0.09%, Nickel≤3%, Niobium≤0.1%, Titanium≤0.1%, Calcium≤0.005%, Copper≤2%, Molybdenum≤0.5%, Vanadium≤0.1%, Boron≤0.003%, Cerium≤0.1%, Magnesium≤0.010%, Zirconium≤0.010% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet including in area fraction, 10 to 60% Bainite, 25 to 55% Ferrite, 5% to 15% Residual Austenite wherein carbon content in residual austenite is between 0.7% and 1% and 5% to 18% Martensite, wherein the cumulated amount of Bainite and Ferrite is at least 70%.