Patents by Inventor Staffan Larsson
Staffan Larsson 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: 20240084413Abstract: A method of heat treating a steel component includes (i) providing the steel component, (ii) nitriding the steel component at a temperature of 800 to 920° C. and a pressure of 20 to 50 mbar for 30 minutes to 8 hours to form a nitrided steel component, and (iii) after step (ii) heating the nitrided steel component at a temperature of 800 to X° C. and a pressure of 1400 to 3000 mbar for at least 30 minutes, where X° C. is about 80° C. less than a melting temperature of the steel and is preferably about 1250° C. to 1350° C.Type: ApplicationFiled: September 1, 2023Publication date: March 14, 2024Inventors: Shanjith RAJA, Rolando VELAZQUEZ, Karl Åke Staffan LARSSON
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Patent number: 11821465Abstract: An inner ring or and outer ring for a roller bearing includes: 0.30-0.45 wt. % carbon, 0.1-0.7 wt. % silicon, 0.6-0.9 wt. % manganese, 0.9-1.2 wt. % chromium, 0.15-0.7 wt. % molybdenum, 0-2.0 wt. % nickel, 0-0.02 wt. % phosphorus, and 0-0.02 wt. % sulfur, the balance being iron and unavoidable impurities. The microstructure of the steel composition contains bainite, and a carbonitrided case layer is provided on a surface of the inner ring or outer ring.Type: GrantFiled: February 17, 2022Date of Patent: November 21, 2023Assignee: AKTIEBOLAGET SKFInventors: Feizhou Zhang, Staffan Larsson
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Publication number: 20230147672Abstract: The invention provides a heat treatment method for a steel product. The steel product includes at least 0.5-0.7% of Si by weight; the method provides the following steps: step 1) putting the steel product under an Austenitizing temperature of 830-890° C. and lasting for a first time to Austenitize the steel product, step 2) immersing the Austenitized steel product in a salt bath at an isothermal temperature of 200-350° C. and lasting for the second time. The method of the invention improves the toughness and elongation of the steel product, keeps the wear resistance of the product, and can be well applied to the fields of thin section ring of bearings and the like. The invention also provides a steel product and a bearing ring.Type: ApplicationFiled: October 8, 2022Publication date: May 11, 2023Inventors: Feizhou Zhang, Meng Zhang, Ming Li, Yunfeng Song, Ping Huang, Karl Åke Staffan Larsson
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Publication number: 20220389559Abstract: The present invention provides a method of heat treating a steel component including the sequential steps of: (a) carbonitriding the steel component; (b) quenching the steel component; (c) optionally tempering the steel component; and (d) ferritically nitrocarburizing the steel component.Type: ApplicationFiled: May 30, 2022Publication date: December 8, 2022Inventors: Karl Åke Staffan Larsson, Marica Ersson
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Publication number: 20220268315Abstract: An inner ring or and outer ring for a roller bearing includes: 0.30-0.45 wt. % carbon, 0.1-0.7 wt. % silicon, 0.6-0.9 wt. % manganese, 0.9-1.2 wt. % chromium, 0.15-0.7 wt. % molybdenum, 0-2.0 wt. % nickel, 0-0.02 wt. % phosphorus, and 0 -0.02 wt. % sulfur, the balance being iron and unavoidable impurities. The microstructure of the steel composition contains bainite, and a carbonitrided case layer is provided on a surface of the inner ring or outer ring.Type: ApplicationFiled: February 17, 2022Publication date: August 25, 2022Inventors: Feizhou Zhang, Staffan Larsson
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Patent number: 10271175Abstract: A method for retrieving maps from a map server is disclosed where, as an intermediate step, map meta-data is requested on the basis of which one or more map can later be selected. Map meta-data on the basis of location data, indicating the location of the user device, and map criteria, specifying at least one condition for selecting maps which may be entered manually or automatically into a user device. The request is sent to a map server where a search for map meta-data matching the received location data and map criteria is executed. In case of at least one match between the map meta-data, the location data and the map criteria, map meta-data associated with at least one map is provided to the user device, such that the user device can select at least one map, which can be acquired from the map server, at least partly on the basis of the retrieved map meta-data.Type: GrantFiled: November 1, 2011Date of Patent: April 23, 2019Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Richard Carlsson, Staffan Larsson, Hjalmar Olsson
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Patent number: 10202678Abstract: Method for heat treating a steel component (28, 36) comprising the steps of: a) carbonitriding the steel component (28, 36) at a temperature of 930-970° C., b) cooling the steel component (28, 36), d) re-heating the steel component (28, 36) to a temperature of 780-820° C. and d) quenching the steel component (28, 36). The method comprises the step of either e) performing a bainite transformation at a temperature just above the martensite formation temperature, transforming 25-99% of the austenite into bainite at the temperature and then increasing the temperature to speed up the transformation of the remaining austenite into bainite, or f) holding the steel component (28, 36) at an initial temperature (T1) above the initial martensite formation temperature (Ms), and lowering the initial temperature (T1) to a temperature (T2) that is below the initial martensite formation temperature (Ms) but above the actual martensite formation temperature during the bainite transformation.Type: GrantFiled: May 22, 2012Date of Patent: February 12, 2019Assignee: Aktiebolaget SKFInventors: Thore Lund, Tobias Meyer, Staffan Larsson, Peter Neuman
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Patent number: 10053764Abstract: A method for heat treating a steel component, which comprises the steps of: (a) carbonitriding the steel component, and (b) austenitically nitrocarburizing the steel component.Type: GrantFiled: August 19, 2013Date of Patent: August 21, 2018Assignee: AKTIEBOLAGET SKFInventors: Staffan Larsson, Walter Datchary, Isabella Flodström, Peter Neuman
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Publication number: 20180073113Abstract: A steel alloy for a bearing, the alloy having a composition having from 0.04 to 0.1 wt. % carbon, from 10.5 to 13 wt. % chromium, from 1.5 to 3.75 wt. % molybdenum, from 0.3 to 1.2 wt. % vanadium, from 0.3 to 2.0 wt .% nickel, from 6 to 9 wt. % cobalt, from 0.05 to 0.4 wt. % silicon, from 0.2 to 0.8 wt. % manganese, from 0.02 to 0.06 wt. % niobium, from 0 to 2.5 wt. % copper, from 0 to 0.1 wt. % aluminium, from 0 to 250 ppm nitrogen, from 0 to 30 ppm boron, and the balance iron, together with any unavoidable impurities.Type: ApplicationFiled: September 5, 2017Publication date: March 15, 2018Inventors: Mohamed Sherif, John Beswick, Staffan Larsson, Yves Maheo
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Patent number: 9834837Abstract: A method for heat treating a steel component, which comprises the steps of: (a) carburizing the steel component with a carbon potential above 1.0, (b) carburizing the steel component with a carbon potential above 0.6, (c) quenching the steep component, and (d) subjecting the steel component to a bainitic treatment.Type: GrantFiled: August 19, 2013Date of Patent: December 5, 2017Assignee: AKTIEBOLAGET SKFInventors: Staffan Larsson, Walter Datchary, Peter Neuman
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Patent number: 9828664Abstract: A method for heat treating a steel component, the method comprising steps of: (a) carbonitriding the steel component and (b) ferritically nitrocarburizing the steel component.Type: GrantFiled: August 19, 2013Date of Patent: November 28, 2017Assignee: AKTIEBOLAGET SKFInventors: Staffan Larsson, Walter Datchary, Isabella Flodström, Peter Neuman
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Publication number: 20170081738Abstract: A method for surface hardening at least one part of a surface of a metal component is provided. The steps include a) enriching the at least one part of a surface of a metal component with at least one of carbon and nitrogen, and b) induction hardening the at least one part of the surface of the metal component.Type: ApplicationFiled: June 5, 2015Publication date: March 23, 2017Applicant: Aktiebolaget SKFInventors: Anna Isabella Flodstrom, Staffan Larsson
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Publication number: 20160363167Abstract: A bearing steel composition having the following composition in weight-%; 0.89-0.95 C, 0.18-0.26 Si, 0.5-0.8 Mn, 1.65-1.95 Cr, 0.2-0.25 Ni, 0.45-0.6 Mo, 0.1-0.3 Cu, 0.001-0.0025 S, and at least one of the following elements: 0-0.018 P, 0.001-0.003 Ca, 0.02-0.05 Al, 0-0.0010 0, 0-0.04 As, 0-0.002 Pb, 0-0.003 Ti, 0.005-0.015 N, 0-0.00015 H, 0-0.03 V, 0-0.075 Sn, 0-0.075 As+Sn+Sb, and a balance Fe, together with unavoidable impurities.Type: ApplicationFiled: June 2, 2016Publication date: December 15, 2016Applicant: Aktiebolaget SKFInventor: Staffan Larsson
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Publication number: 20160348206Abstract: The present disclosure relates to a method for restoring a steel structure for a steel component, such as a soft annealed steel component, a welding joint comprising the steps of welding the steel component to form a welding joint, quenching the steel component to a temperature of above the martensite start temperature (Ms) and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite, re-heating the steel component to a temperature of 950 to 1110° C., quenching the steel component to a temperature of above the martensite start temperature (Ms) to form bainite, and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite to bainite, re-heating the steel component to a temperature of at least 580° C.Type: ApplicationFiled: May 25, 2016Publication date: December 1, 2016Applicant: Aktiebolaget SKFInventor: Staffan Larsson
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Publication number: 20160348205Abstract: The present disclosure relates to a method for restoring the steel structure of a steel component after heating the steps of heating the steel component to a temperature of at least 1100° C., quenching the steel component to a temperature above the martinsite start temperature (Ms), and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite, re-heating the steel component to a temperature of 950 to 1110° C., quenching the steel component to a temperature above the martensite start temperature (Ms), and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite, re-heating the steel component to a temperature of above the Ac1 transformation temperature and below 800° C.Type: ApplicationFiled: May 24, 2016Publication date: December 1, 2016Applicant: Aktiebolaget SKFInventor: Staffan LARSSON
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Publication number: 20160348204Abstract: The present disclosure relates to a method for improving the steel structure of a steel component after heating including the steps of heating the steel component to a temperature of at least 1100° C., quenching the steel component to a temperature above the martensite start temperature (Ms) to form bainite, and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite to bainite, re-heating the steel component to a temperature of at least 580° C. but below the Ac1 transformation temperature, and maintaining the steel component at that temperature for the steel component to exhibit a hardness of 45 Rockwell hardness C or below, and cooling the steel component.Type: ApplicationFiled: May 24, 2016Publication date: December 1, 2016Applicant: Aktiebolaget SKFInventor: Staffan Larsson
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Publication number: 20150283643Abstract: A method for manufacturing a steel component having a flash butt welded joint. The method comprises a step of flash butt welding the weld joint by flashing and upsetting the weld and a step of supplying heat to at least the weld joint of said component after the step of upsetting the weld to increase the temperature of the weld joint, or to maintain the temperature of the weld joint at an elevated temperature.Type: ApplicationFiled: November 26, 2012Publication date: October 8, 2015Inventors: Patrik Dahlman, Viktor Recina, Staffan Larsson
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Publication number: 20150240341Abstract: A method for heat treating a steel component, which comprises the steps of: (a) carbonitriding the steel component, and (b) austenitically nitrocarburizing the steel component.Type: ApplicationFiled: August 19, 2013Publication date: August 27, 2015Inventors: Staffan Larsson, Walter Datchary, Isabella Flodström, Peter Neuman
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Publication number: 20150225835Abstract: A method for heat treating a steel component, the method comprising steps of: (a) carbonitriding the steel component and (b) ferritically nitrocarburizing the steel component.Type: ApplicationFiled: August 19, 2013Publication date: August 13, 2015Inventors: Staffan Larsson, Walter Datchary, Isabella Flodström, Peter Neuman
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Publication number: 20150218688Abstract: A method for heat treating a steel component, which comprises the steps of: (a) carburizing the steel component with a carbon potential above 1.0, (b) carburizing the steel component with a carbon potential above 0.6, (c) quenching the steep component, and (d) subjecting the steel component to a bainitic treatment.Type: ApplicationFiled: August 19, 2013Publication date: August 6, 2015Inventors: Staffan Larsson, Peter Neuman