Patents by Inventor Zacharias Georgeou
Zacharias Georgeou 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: 20240084414Abstract: A method for producing a component from a blank made of a medium manganese steel having 4 to 12 wt. % Mn and a TRIP effect at room temperature, in which method the blank is mechanically cut to make a prepared blank having the desired dimensions, cut edges are produced on the prepared blank by means of mechanical cutting, and the prepared blank with the cut edges is cold-formed to obtain the component at room temperature or at a temperature above room temperature but below 60° C. The method is distinguished by cost-effective production, improved formability with reduced cracking at the formed cut edges, while simultaneously reducing the forming forces. The mechanical cutting is performed at a pre-heating temperature in the range of 60° C. to less than 250° C.Type: ApplicationFiled: January 20, 2022Publication date: March 14, 2024Inventors: Peter Palzer, Zacharias Georgeou
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Patent number: 11047018Abstract: The invention relates to a steel strip for producing a non-oriented electrical steel. To achieve greatly improved frequency-independent magnetic properties, in particular greatly reduced hysteresis losses, in comparison with known electrical steels, the following alloy composition in wt % is proposed: C: ?0.03, Al: 1 to 12, Si: 0.3 to 3.5, Mn: >0.25 to 10, Cu: >0.05 to 3.0, Ni: >0.01 to 5.0, total of N, S and P: at most 0.07, remainder iron and smelting-related impurities, with the optional addition of one or more elements from the group Cr, Mo, Zn and Sn, wherein the steel strip has an insulation layer substantially consisting of Al2O3 and/or SiO2 with a thickness in the range from 10 ?m to 100 ?m. The invention also relates to a method for producing such a steel strip.Type: GrantFiled: July 13, 2017Date of Patent: June 29, 2021Assignee: SALZGITTER FLACHSTAHL GMBHInventors: Zacharias Georgeou, Frank Klose
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Patent number: 10435764Abstract: A method is disclosed for calculating the combination of properties of phase components and of mechanical properties being established of a predefined alloy composition for a deformable lightweight steel having the elements in percent by weight C 0.02 to ?1.0, Al 2.5 to ?8.0, Si 0.0 to ?1.5, Mn ?5.0 to ?35.0, Cr >1.0 to ?14.0, total content of N, S, P ?0.1, the remainder iron and other steel-accompanying elements with some contents of Cu, Mo, Ni, and Zn of up to 1.0 wt % in total by using specific formulas on the basis of the manganese content, wherein, in the formulas, the alloy contents are used as absolute numbers without dimensions, and the calculated, dimensionless values are assigned the units MPa for Rm and Rp and % for A80.Type: GrantFiled: April 8, 2015Date of Patent: October 8, 2019Assignee: Salzgitter Flachstahl GmbHInventors: Zacharias Georgeou, Frank Klose
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Publication number: 20190271053Abstract: The invention relates to a steel strip for producing a non-oriented electrical steel. To achieve greatly improved frequency-independent magnetic properties, in particular greatly reduced hysteresis losses, in comparison with known electrical steels, the following alloy composition in wt % is proposed: C: ?0.03, Al: 1 to 12, Si: 0.3 to 3.5, Mn: >0.25 to 10, Cu: >0.05 to 3.0, Ni: >0.01 to 5.0, total of N, S and P: at most 0.07, remainder iron and smelting-related impurities, with the optional addition of one or more elements from the group Cr, Mo, Zn and Sn, wherein the steel strip has an insulation layer substantially consisting of Al2O3 and/or SiO2 with a thickness in the range from 10 ?m to 100 ?m. The invention also relates to a method for producing such a steel strip.Type: ApplicationFiled: July 13, 2017Publication date: September 5, 2019Applicant: Salzgitter Flachstahl GmbHInventors: ZACHARIAS GEORGEOU, FRANK KLOSE
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Patent number: 10253399Abstract: An energy-storing container is made of a lightweight steel having the following chemical composition (in wt %): C 0.04-2%; Mn 14-30%; Al 1.5-12%; Si 0.3-3%; Cr 0.12-6%, and additionally one or more of the following elements: Ti, V, Nb, B, Zr, Mo, Ni, Cu, W, Co, P, N, each at up to 5% and in total at up to 10%, wherein the remainder is Fe including common steel tramp elements, wherein the concrete alloy composition is selected in order to limit the ??-martensite fraction before or after a forming process to no more than 3%, with the stipulation that the ??-martensite equivalent according to 0.1*wt % Mn+wt % C+0.05*wt % Si is between 3.4 and 10.5.Type: GrantFiled: January 21, 2016Date of Patent: April 9, 2019Assignee: SALZGITTER FLACHSTAHL GMBHInventors: Michael Braun, Manuel Otto, Zacharias Georgeou, Bianca Springub
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Patent number: 10214790Abstract: A method is disclosed for producing components from an austenitic lightweight steel which is metastable in its initial state, by forming of a sheet, a circuit board or a pipe in one or more steps, exhibiting a temperature-dependent TRIP and/or TWIP effect during forming. To obtain a component with, in particular, high toughness, the forming is carried out at a temperature above room temperature, at 40 to 160° C., which avoids the TRIP/TWIP effect, and to achieve in particular high component strength, the forming is carried out at a temperature below room temperature, at ?65 to 0° C., which enhances the TRIP/TWIP effect.Type: GrantFiled: May 6, 2013Date of Patent: February 26, 2019Assignee: Salzgitter Flachstahl GmbHInventors: Thomas Evertz, Manuel Otto, Bianca Springub, Zacharias Georgeou
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Publication number: 20180313471Abstract: A composite pipe includes a carrier pipe and at least one protective pipe. The carrier pipe is produced from a non-corrosion resistant steel, which has at least a partially austenitic structure, with the following chemical composition (in wt. %): C: 0.005 to 1.4; Mn: 5 to 35; the remainder being iron including unavoidable elements accompanying steel, with the optional alloying of the following elements (in wt. %): Ni: 0 to 6; Cr: 0 to 9; Al: 0 to 15; Si: 0 to 8; Mo: 0 to 3; Cu: 0 to 4; V: 0 to 2; Nb: 0 to 2; Ti: 0 to 2; Sb: 0 to 0.5; B: 0 to 0.5; Co: 0 to 5; W: 0 to 3; Zr: 0 to 4; Ca: 0 to 0.1; P: to 0.6; S: 0 to 0.2; N: 0.002 to 0.3. In a method for producing a composite pipe of this type, the carrier pipe and the at least one protective pipe are mechanically or metallurgically connected to one another.Type: ApplicationFiled: October 19, 2016Publication date: November 1, 2018Applicant: Salzgitter Flachstahl GmbHInventors: MARC DEBEAUX, PETER PALZER, KAI KÖHLER, ZACHARIAS GEORGEOU
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Publication number: 20180216207Abstract: The invention relates to a formable lightweight steel having improved mechanical properties and a high resistance to delayed hydrogen-induced cracking formation and hydrogen embrittlement comprising the following elements (in wt. %): C 0.02 to ?1.0; Mn 3 to 30; Si?4; P max. 0.1; S max. 0.1; N max. 0.03; Sb 0.003 to 0.8, particularly advantageously to 0.5, as well as at least one or more of the following carbide-forming elements in the specified proportions (in wt. %): Al?15; Cr>0.1 to 8; Mo 0.05 to 2; Ti 0.01 to 2; V 0.005 to 1; Nb 0.005 to 1; W 0.005 to 1; Zr 0.001 to 0.3; with the remainder consisting of iron including the usual steel-accompanying elements, with the optional addition of the following elements, in wt. %: max. 5 Ni, max. 10 Co, max. 0.005 Ca, max. 0.01 B and 0.05 to 2 Cu. The invention also relates to a method for producing the said lightweight steel.Type: ApplicationFiled: July 20, 2016Publication date: August 2, 2018Applicant: Salzgitter Flachstahl GmbHInventors: Peter PALZER, ZACHARIAS GEORGEOU
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Patent number: 9833863Abstract: A welding additive for electric arc welding and laser beam welding of mixed joins composed of austenitic and high-manganese-containing and ferritic steel, where the high-manganese-containing steel has a manganese content of at least 7-30% by weight includes the following alloy elements in % by weight: C 0.04-1.0; Mn 7-30; Si?6; Al?4; Mo?2; Ti?0.5; Zr 0.01-01; B 0.001-0.01; P<0.005; S<0.002; N<0.008; balance iron and unavoidable steel accompanying elements.Type: GrantFiled: November 15, 2012Date of Patent: December 5, 2017Assignee: Salzgitter Flachstahl GmbHInventors: Wilko Flügge, Matthias Höfemann, Bianca Springub, Zacharias Georgeou
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Patent number: 9593392Abstract: A method for producing a workpiece having properties which are adjustable across a wall thickness or strip thickness of the workpiece, includes the steps of subjecting the workpiece to a decarburizing annealing treatment under an oxidizing atmosphere and to an accelerated cooling and/or a cold forming for generating a property gradient of the workpiece, wherein the workpiece is made of an austenitic lightweight steel which has an alloy composition which includes by weight percent 0.2% to 1% carbon, 0.05% to<15% aluminum, 0.05% to 6.0% silicon, 9% to<30% manganese, and at least one element selected from the group consisting of chromium, copper, boron, titanium, zirconium, vanadium and niobium, wherein chromium=4.0%; titanium+zirconium=0.7%; niobium+vanadium=0.5%, boron=1%, the remainder iron including common steel companion elements.Type: GrantFiled: February 10, 2011Date of Patent: March 14, 2017Assignee: SALZGITTER FLACHSTAHL GMBHInventors: Daniela John, Manuel Otto, Rune Schmidt-Jürgensen, Thomas Evertz, Zacharias Georgeou, Bianca Springub
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Publication number: 20170037490Abstract: A method is disclosed for calculating the combination of properties of phase components and of mechanical properties being established of a predefined alloy composition for a deformable lightweight steel having the elements in percent by weight C 0.02 to ?1.0, Al 2.5 to ?8.0, Si 0.0 to ?1.5, Mn?5.0 to ?35.0, Cr>1.0 to ?14.0, total content of N, S, P?0.1, the remainder iron and other steel-accompanying elements with some contents of Cu, Mo, Ni, and Zn of up to 1.0 wt % in total by using specific formulas on the basis of the manganese content, wherein, in the formulas, the alloy contents are used as absolute numbers without dimensions, and the calculated, dimensionless values are assigned the units MPa for Rm and Rp and % for A80.Type: ApplicationFiled: April 8, 2015Publication date: February 9, 2017Applicant: SALZGITTER FLACHSTAHL GMBHInventors: ZACHARIAS GEORGEOU, FRANK KLOSE
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Patent number: 9393615Abstract: A method for producing a cast strip from steel with properties that can be adjusted across a cross section and a length of the strip, includes applying a coating mass including a carrier liquid with additives contained therein to a side of a rotating cast band of a horizontal strip cast system, drying the coating mass for removing liquid components of the coating mass, applying a steel melt to the side of the rotating cast band via a melt container, wherein the dried coating mass is materially united with the applied steel melt; and allowing the steel melt to solidifiy to a pre-strip.Type: GrantFiled: January 6, 2012Date of Patent: July 19, 2016Assignee: SALZGITTER FLACHSTAHL GMBHInventors: Thomas Evertz, Zacharias Georgeou, Bianca Springub, Hellfried Eichholz, Rune Schmidt-Jürgensen
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Publication number: 20160138146Abstract: An energy-storing container is made of a lightweight steel having the following chemical composition (in wt %): C 0.04-2%; Mn 14-30%; Al 1.5-12%; Si 0.3-3%; Cr 0.12-6%, and additionally one or more of the following elements: Ti, V, Nb, B, Zr, Mo, Ni, Cu, W, Co, P, N, each at up to 5% and in total at up to 10%, wherein the remainder is Fe including common steel tramp elements, wherein the concrete alloy composition is selected in order to limit the ??-martensite fraction before or after a forming process to no more than 3%, with the stipulation that the ??-martensite equivalent according to 0.1*wt % Mn wt % C 0.05*wt % Si is between 3.4 and 10.5.Type: ApplicationFiled: January 21, 2016Publication date: May 19, 2016Applicant: Salzgitter Flachstahl GmbHInventors: MICHAEL BRAUN, MANUEL OTTO, ZACHARIAS GEORGEOU, BIANCA SPRINGUB
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Publication number: 20160122839Abstract: A method is disclosed for producing components from an austenitic lightweight steel which is metastable in its initial state, by forming of a sheet, a circuit board or a pipe in one or more steps, exhibiting a temperature-dependent TRIP and/or TWIP effect during forming. To obtain a component with, in particular, high toughness, the forming is carried out at a temperature above room temperature, at 40 to 160° C., which avoids the TRIP/TWIP effect, and to achieve in particular high component strength, the forming is carried out at a temperature below room temperature, at ?65 to 0° C., which enhances the TRIP/TWIP effect.Type: ApplicationFiled: May 6, 2013Publication date: May 5, 2016Applicant: SALZGITTER FLACHSTAHL GMBHInventors: THOMAS EVERTZ, MANUEL OTTO, BIANCA SPRINGUB, ZACHARIAS GEORGEOU
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Publication number: 20150013845Abstract: A hot strip for producing an electric steel sheet has the following alloy composition in weight %: C: 0.001 to 0.08 Al: 4.8 to 20 Si: 0.05 to 10 B: up to 0.1 Zr: up to 0.1 Cr: 0.1 to 4, remainder iron and melting related impurities.Type: ApplicationFiled: January 30, 2013Publication date: January 15, 2015Inventors: Zacharias Georgeou, Alexander Redenius
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Publication number: 20140299590Abstract: A welding additive for electric arc welding and laser beam welding of mixed joins composed of austenitic and high-manganese-containing and ferritic steel, where the high-manganese-containing steel has a manganese content of at least 7-30% by weight includes of the following alloy elements in % by weight: C 0.04-1.0; Mn 7-30; Si?6; Al?4; Mo?2; Ti?0.5; Zr 0.01-01; B 0.001-0.01; P<0.005; S<0.002; N<0.008; balance iron and unavoidable steel accompanying elements.Type: ApplicationFiled: November 15, 2012Publication date: October 9, 2014Inventors: Wilko Flügge, Matthias Höfemann, Bianca Springub, Zacharias Georgeou
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Publication number: 20130240520Abstract: An energy-storing container is made of a lightweight steel having the following chemical composition (in wt %): C 0.04-2%; Mn 14-30%; Al 1.5-12%; Si 0.3-3%; Cr 0.12-6%, and additionally one or more of the following elements: Ti, V, Nb, B, Zr, Mo, Ni, Cu, W, Co, P, N, each at up to 5% and in total at up to 10%, wherein the remainder is Fe including common steel tramp elements, wherein the concrete alloy composition is selected in order to limit the a?-martensite fraction before or after a forming process to no more than 3%, with the stipulation that the a?-martensite equivalent according to 0.1*wt % Mn+wt % C+0.05*wt % Si is between 3.4 and 10.5.Type: ApplicationFiled: October 28, 2011Publication date: September 19, 2013Applicant: SALZGITTER FLACHSTAHL GMBHInventors: Michael Braun, Manuel Otto, Zacharias Georgeou, Bianca Springub
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Publication number: 20130048150Abstract: A method for producing a workpiece having properties which are adjustable across a wall thickness or strip thickness of the workpiece, includes the steps of subjecting the workpiece to a decarburizing annealing treatment under an oxidizing atmosphere and to an accelerated cooling and/or a cold forming for generating a property gradient of the workpiece, wherein the workpiece is made of an austenitic lightweight steel which has an alloy composition which includes by weight percent 0.2% to 1% carbon, 0.05% to <15% aluminum, 0.05% to 6.0% silicon, 9% to <30% manganese, and at least one element selected from the group consisting of chromium, copper, boron, titanium, zirconium, vanadium and niobium, wherein chromium=4.0%; titanium+zirconium=0.7%; niobium+vanadium=0.5%, boron=1%, the remainder iron including common steel companion elements.Type: ApplicationFiled: February 10, 2011Publication date: February 28, 2013Applicant: SALZGITTER FLACHSTAHL GMBHInventors: Daniela John, Manuel Otto, Rune Schmidt-Jürgensen, Thomas Evertz, Zacharias Georgeou, Bianca Springub
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METHOD FOR PRODUCING A HOT ROLLED STRIP AND HOT ROLLED STRIP PRODUCED FROM TRIPLEX LIGHTWEIGHT STEEL
Publication number: 20120121452Abstract: The invention relates to a method for producing a hot strip from a triplex lightweight steel, wherein a melt is cast into a roughed strip and the latter is subsequently rolled into a hot strip. For this purpose, it is provided that the melt is cast in a horizontal strip casting facility under conditions of a calm flow and free of bending into a roughed strip in the range between 6 and 20 mm and is subsequently rolled into hot strip having a degree of deformation of at least 50%.Type: ApplicationFiled: March 11, 2009Publication date: May 17, 2012Applicant: SALZGITTER FLACHSTAHL GMBHInventors: Karl-Heinz Spitzer, Bianca Springub, Joachim Konrad, Hellfried Eichholz, Markus Schäperkötter, Zacharias Georgeou