Patents by Inventor Josée DRILLET
Josée DRILLET has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230141248Abstract: A cold rolled and galvannealed steel sheet having a composition including, by weight percent: C 0.15-0.25%, Mn 2.4-3.5%, Si 0.30-0.90%, Cr 0.30-0.70%, Mo 0.05-0.35%, Al 0.001-0.09%, Ti 0.01-0.06, B 0.0010-0.0040%, Nb 0.01-0.05%, P?0.020%, S?0.010% and N?0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction, between 80% and 90% of martensite, the balance being ferrite and bainite.Type: ApplicationFiled: February 8, 2021Publication date: May 11, 2023Inventors: Gregory INACIO DA ROSA, Lijia ZHAO, Dongwei FAN, Josée DRILLET
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Publication number: 20230038535Abstract: A steel sheet has a composition comprising 0.060%?C?0.085%, 1.8%?Mn?2.0%, 0.4%?Cr?0.6%, 0.1%?Si?0.5%, 0.010%?Nb?0.025%, 3.42N?Ti?0.035%, 0?Mo?0.030%, 0.020%?Al?0.060%, 0.0012%?B?0.0030%, S?0.005%, P?0.050%, 0.002%?N?0.007% and optionally 0.0005%?Ca?0.005%, the remainder of the composition being iron and unavoidable impurities. The microstructure consists of 34% to 80% bainite, 10% to 16% martensite, and 10% to 50% of ferrite. The surface fraction of unrecrystallized ferrite, with respect to the whole structure, is of less than 30%. The martensite consists of self-tempered martensite and fresh martensite, the surface fraction of self-tempered martensite being comprised between 4% and 10%.Type: ApplicationFiled: December 18, 2019Publication date: February 9, 2023Inventor: Josée DRILLET
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Patent number: 10697052Abstract: The present invention provides a cold-rolled and annealed steel sheet of thickness between 0.7 mm and 2 mm, mechanical strength ranging from 1180 MPa to 1320 MPa, wherein the hole expansion ratio Ac % is greater than 20% and the bending angle is greater than or equal to 40°. The chemical composition includes, the contents being expressed as weight percent: 0.09%?C?0.11%, 2.6%?Mn?2.8%, 0.20%?Si?0.55%, 0.25%?Cr<0.5%, 0.025%?Ti?0.040%, 0.0015%?B?0.0025%, 0.005%?Al?0.18%, 0.08%?Mo?0.15%, 0.020%?Nb?0.040%, 0.002%?N?0.007%, 0.0005%?S?0.005%, 0.001%?P?0.020%, Ca?0.003%, the remainder being iron and inevitable impurities resulting from processing. The sheet has a microstructure including martensite or lower bainite.Type: GrantFiled: June 9, 2016Date of Patent: June 30, 2020Assignee: ArcelorMittalInventors: Josee Drillet, Veronique Hebert
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Patent number: 10597745Abstract: A cold-rolled and annealed steel sheet is provided, the chemical composition of which comprises, the contents being expressed by weight percent: 0.10?C?0.13% 2.4?Mn?2.8% 0.30?Si?0.55% 0.30?Cr?0.56% 0.020?Ti?0.050% 0.0020?B?0.0040% 0.005?Al?0.050% Mo?0.010% Nb?0.040% 0.002?N?0.008% S?0.005% P?0.020%, the remainder consisting of iron and unavoidable impurities resulting from the smelting, the steel sheet having a microstructure consisting of, in surface proportion, martensite and/or lower bainite, said martensite comprising fresh martensite and/or self-tempered martensite, the sum of the surface proportions of martensite and lower bainite being comprised between 60 to 95%, 4 to 35% of low carbide containing bainite, 0 to 5% of ferrite, and less than 5% of retained austenite in island form.Type: GrantFiled: December 5, 2014Date of Patent: March 24, 2020Assignee: ARCELORMITTALInventors: Josée Drillet, Véronique Hebert
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Publication number: 20180171459Abstract: The present invention provides a cold-rolled and annealed steel sheet of thickness between 0.7 mm and 2 mm, mechanical strength ranging from 1180 MPa to 1320 MPa, wherein the hole expansion ratio Ac % is greater than 20% and the bending angle is greater than or equal to 40°. The chemical composition includes, the contents being expressed as weight percent: 0.09%?C?0.11%, 2.6%?Mn?2.8%, 0.20%?Si?0.55%, 0.25%?Cr<0.5%, 0.025%?Ti?0.040%, 0.0015%?B?0.0025%, 0.005%?Al?0.18%, 0.08%?Mo?0.15%, 0.020%?Nb?0.040%, 0.002%?N?0.007%, 0.0005%?S?0.005%, 0.001%?P?0.020%, Ca?0.003%, the remainder being iron and inevitable impurities resulting from processing. The sheet has a microstructure including martensite or lower bainite.Type: ApplicationFiled: June 9, 2016Publication date: June 21, 2018Inventors: Josee Drillet, Veronique Hebert
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Patent number: 9765415Abstract: A cold-rolled and annealed ferritic steel sheet is provided. The steel has a composition comprising, expressed by weight: 0.001?C?0.15%; Mn?1%; Si?1.5%; 7.5%?AI?10%; 0.020%?Ti?0.5%; S?0.050%; and P?0.1%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The structure includes kappa (?) precipitates and equiaxed ferrite, an average grain size d? of the equiaxed ferrite is less than 50 microns, and a linear fraction f of intergranular ? precipitates is less than 30%. The linear fraction f is defined by f = ? ( A ) ? di ? ( A ) ? Li . ?(A)di denotes the total length of grain boundaries containing ? precipitates relative to an area (A) and ?(A)Li denotes the total length of the grain boundaries relative to the area (A). A content of carbon in solid solution is less than 0.005% by weight, and the cold-rolled and annealed ferritic steel sheet has a thickness between 0.6 mm and 1.5 mm.Type: GrantFiled: December 9, 2016Date of Patent: September 19, 2017Assignee: ArcelorMittal FranceInventors: Astrid Perlade, Olivier Bouaziz, Xavier Garat, Josée Drillet, Jean-Louis Uriarte
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Publication number: 20170101694Abstract: A cold-rolled and annealed ferritic steel sheet is provided. The steel has a composition comprising, expressed by weight: 0.001?C?0.15%; Mn?1%; Si?1.5%; 7.5%?AI?10%; 0.020%?Ti?0.5%; S?0.050%; and P?0.1%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The structure includes kappa (?) precipitates and equiaxed ferrite, an average grain size d? of the equiaxed ferrite is less than 50 microns, and a linear fraction f of intergranular ? precipitates is less than 30%. The linear fraction f is defined by f = ? ( A ) ? di ? ( A ) ? Li . ?(A)di denotes the total length of grain boundaries containing ? precipitates relative to an area (A) and ?(A)Li denotes the total length of the grain boundaries relative to the area (A). A content of carbon in solid solution is less than 0.005% by weight, and the cold-rolled and annealed ferritic steel sheet has a thickness between 0.6 mm and 1.5 mm.Type: ApplicationFiled: December 9, 2016Publication date: April 13, 2017Inventors: Astrid Perlade, Olivier Bouaziz, Xavier Garat, Josée Drillet, Jean-Louis IRIARTE
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Patent number: 9580766Abstract: The invention relates to a hot-rolled ferritic steel sheet, the composition of the steel of which comprises, the contents being expressed by weight: 0.001?C?0.15%, Mn?1%, Si?1.5%, 6%?Al?10%, 0.020%?Ti?0.5%, S?0.050%, P?0.1%, and, optionally, one or more elements chosen from: Cr?1%, Mo?1%, Ni?1%, Nb?0.1%, V?0.2%, B?0.010%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the average ferrite grain size dIV measured on a surface perpendicular to the transverse direction with respect to the rolling being less than 100 microns.Type: GrantFiled: April 29, 2008Date of Patent: February 28, 2017Assignee: ArcelorMittal FranceInventors: Astrid Perlade, Xavier Garat, Jean-Louis Uriarte, Olivier Bouaziz, Josee Drillet
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Publication number: 20160312326Abstract: A cold-rolled and annealed steel sheet is provided, the chemical composition of which comprises, the contents being expressed by weight percent: 0.10?C?0.13% 2.4?Mn?2.8% 0.30?Si?0.55% 0.30?Cr?0.56% 0.020?Ti?0.050% 0.0020?B?0.0040% 0.005?Al?0.050% Mo?0.010% Nb?0.040% 0.002?N?0.008% S?0.005% P?0.020%, the remainder consisting of iron and unavoidable impurities resulting from the smelting, the steel sheet having a microstructure consisting of, in surface proportion, martensite and/or lower bainite, said martensite comprising fresh martensite and/or self-tempered martensite, the sum of the surface proportions of martensite and lower bainite being comprised between 60 to 95%, 4 to 35% of low carbide containing bainite, 0 to 5% of ferrite, and less than 5% of retained austenite in island form.Type: ApplicationFiled: December 5, 2014Publication date: October 27, 2016Applicant: ArcelorMittalInventors: Josée DRILLET, Véronique HEBERT
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Publication number: 20100300585Abstract: The invention relates to a hot-rolled ferritic steel sheet, the composition of the steel of which comprises, the contents being expressed by weight: 0.001?C?0.15%, Mn?1%, Si?1.5%, 6%?Al?10%, 0.020%?Ti?0.5%, S?0.050%, P?0.1%, and, optionally, one or more elements chosen from: Cr?1%, Mo?1%, Ni?1%, Nb?0.1%, V?0.2%, B?0.010%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the average ferrite grain size dIV measured on a surface perpendicular to the transverse direction with respect to the rolling being less than 100 microns.Type: ApplicationFiled: April 29, 2008Publication date: December 2, 2010Applicant: ARCELORMITTAL FRANCEInventors: Astrid Perlade, Xavier Garat, Jean-Louis Uriarte, Olivier Bouaziz, Josee Drillet