Patents by Inventor Jan Y. Jonsson
Jan Y. Jonsson 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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Patent number: 11932926Abstract: A duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the high pitting resistance equivalent. The duplex stainless steel contains less than 0.04 weight % carbon, 0.2-0.8 weight % silicon, 0.3-2.0 weight % manganese, 14.0-19.0 weight % chromium, 2.0-5.0 weight % nickel, 4.0-7.0 weight % molybdenum, less than 4.5 weight % tungsten, 0.1-1.5 weight % copper, 0.14-0.23 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels. Further, the co-effect of the chromium, molybdenum and tungsten contents in weight % is in the range of 20<(Cr+Mo+0.5W)<23.5, where the ratio Cr/(Mo+0.5W) is in the range of 2-4.75.Type: GrantFiled: June 11, 2015Date of Patent: March 19, 2024Assignee: Outokumpu OyjInventors: James Oliver, Jan Y. Jonsson
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Publication number: 20230357909Abstract: Austenitic stainless steel utilizing the TRIP effect with a balanced pitting resistance equivalent for high corrosion resistance. The austenitic stainless steel contains 0-0.04 weight % C, 0.2-0.8 weight % Si, 0-2.0 weight % Mn, 16.0-19.0 weight % Cr, 4.0-6.5 weight % Ni, 1.0-4.0 weight % Mo, 0-4.0 weight % W, 0-2.0 weight % Cu, 0.20-0.30 weight % N, the rest being iron and inevitable impurities occurring in stainless steels, the proportion of the ferrite phase in the microstructure is 0-10.0 volume %, the rest being austenite, when quenched and heat treated at the temperature range of 900-1200° C., preferably 950-1150° C.Type: ApplicationFiled: August 31, 2021Publication date: November 9, 2023Inventors: James OLIVER, Jan Y. JONSSON
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Publication number: 20230340634Abstract: A method of suppressing embrittlement of stainless steel in a stainless steel production process comprising the steps of ?manufacturing stainless steel in a conventional stainless steel manufacturing process ?annealing the stainless steel in an annealing step ?cooling the steel in a cooling step or quenching the steel in a quenching step and ?applying a magnetic field to the stainless steel during the cooling or quenching stepType: ApplicationFiled: October 8, 2021Publication date: October 26, 2023Inventors: Jan Y. JONSSON, James OLIVER, Nataliya LIMBACH-MALYAR, Peter HEDSTRÖM
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Patent number: 11692253Abstract: A duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the balanced pitting resistance equivalent is formed with less than 0.04 weight % carbon, 0.2-0.8 weight % silicon, less than 2.0 weight % manganese, 16.5-19.5 weight % chromium, 3.0-4.7 weight % nickel, 1.5-4.0 weight % molybdenum, less than 3.5 weight % tungsten, less than 1 weight % copper, 0.13-0.26 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels.Type: GrantFiled: February 2, 2015Date of Patent: July 4, 2023Assignee: Outokumpu OyjInventors: James Oliver, Jan Y. Jonsson
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Patent number: 11555231Abstract: The invention relates a duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the balanced pitting resistance equivalent. The duplex stainless steel contains less than 0.04 weight % carbon, less than 0.7 weight % silicon, less than 2.5 weight % manganese, 18.5-22.5 weight % chromium, 0.8-4.5 weight % nickel, 0.6-1.4 weight % molybdenum, less than 1 weight % copper, 0.10-0.24 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels.Type: GrantFiled: September 5, 2012Date of Patent: January 17, 2023Assignee: OUTOKUMPU OYJInventors: James Oliver, Jan Y. Jonsson, Alexander Thulin
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Patent number: 11286546Abstract: The invention relates to a method for manufacturing a ferritic-austenitic stainless steel having good formability and high elongation. The stainless steel is heat treated so that the microstructure of the stainless steel contains 45-75% austenite in the heat treated condition, the remaining microstructure being ferrite, and the measured Md30 temperature of the stainless steel is adjusted between 0 and 50° C. in order to utilize the transformation induced plasticity (TRIP) for improving the formability of the stainless steel.Type: GrantFiled: April 18, 2011Date of Patent: March 29, 2022Assignee: Outokumpu OyjInventors: James Oliver, Jan Y. Jonsson, Juho Talonen
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Patent number: 10407746Abstract: The invention relates to a method for manufacturing a ferritic-austenitic stainless steel having good formability, good weldability and high elongation. The stainless steel containing the sum of carbon and nitrogen C+N in the range 0.17-0.295 in weight % in which sum C+N a lower carbon content to avoid sensitisation during welding is compensated by an increased nitrogen content to maintain formability is heat treated so that the microstructure of the stainless steel contains 45-75% austenite in the heat treated condition, the remaining microstructure being ferrite, and the measured Md30 temperature of the stainless steel is adjusted between 0 and 50° C. in order to utilize the transformation induced plasticity (TRIP) for improving the formability of the stainless steel.Type: GrantFiled: April 18, 2012Date of Patent: September 10, 2019Assignee: OUTOKUMPU OYJInventors: James Oliver, Jan Y. Jonsson, Juho Talonen, Rachel Petersson, Jan-Olof Andersson
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Publication number: 20170130305Abstract: The invention relates to a duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the high pitting resistance equivalent. The duplex stainless steel contains less than 0,04 weight % carbon, 0,2-0,8 weight % silicon, 0,3-2,0 weight % manganese, 4,0-19,0 weight % chromium, 2,0-5,0 weight % nickel, 4,0-7,0 weight % molybdenum, less than 4,5 weight % tungsten, 0,1-1,5 weight % copper, 0,14-0,23 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels. Further, the co-effect of the chromium, molybdenum and tungsten contents in weight % is in the range of 20<(Cr+Mo+0,5 W)<23,5, where the ratio Cr/(Mo+0,5W) is in the range of 2-4,75.Type: ApplicationFiled: June 11, 2015Publication date: May 11, 2017Applicant: Outokumpu OyjInventors: James Oliver, Jan Y. Jonsson
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Patent number: 9637813Abstract: The present invention relates to duplex ferritic austenitic stainless steel for the use chemical industry for nitric acid environments wherein good uniform corrosion resistance and high strength are required. The microstructure of the stainless steel has 35-65 volume % of ferrite, preferably 45-55 volume % of ferrite, the balance being austenite. The chemical composition contains less than 0.03 weight % carbon, less than 1 weight % silicon, less than 3 weight % manganese, 26-29.5 weight % chromium, 5-8.5 weight % nickel, 1-3 weight % molybdenum, 0.25-0.35 weight % nitrogen, 1-3 weight % copper, the rest being iron and inevitable impurities occurring in stainless steels.Type: GrantFiled: November 1, 2012Date of Patent: May 2, 2017Assignee: Outokumpu OyjInventors: Alexander Thulin, Jan Y. Jonsson, Mats Liljas, Rachel Pettersson, Jan-Olof Andersson, Staffan Hertzman
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Publication number: 20160369382Abstract: The invention relates to a duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the balanced pitting resistance equivalent. The duplex stainless steel contains less than 0.04 weight % carbon, 0.2-0.8 weight % silicon, less than 2.0 weight % manganese, 16.5-19.5 weight % chromium, 3.0-4.7 weight % nickel, 1.5-4.0 weight % molybdenum, less than 3.5 weight % tungsten, less than 1 weight % copper, 0.13-0.26 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels.Type: ApplicationFiled: February 2, 2015Publication date: December 22, 2016Applicant: Outokumpu OyjInventors: James Oliver, Jan Y. Jonsson
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Publication number: 20150050180Abstract: The present invention relates to duplex ferritic austenitic stainless steel for the use chemical industry for nitric acid environments wherein good uniform corrosion resistance and high strength are required. The microstructure of the stainless steel has 35-65 volume % of ferrite, preferably 45-55 volume % of ferrite, the balance being austenite. The chemical composition contains less than 0.03 weight % carbon, less than 1 weight % silicon, less than 3 weight % manganese, 26-29.5 weight % chromium, 5-8.5 weight % nickel, 1-3 weight % molybdenum, 0.25-0.35 weight % nitrogen, 1-3 weight % copper, the rest being iron and inevitable impurities occurring in stainless steels.Type: ApplicationFiled: November 1, 2012Publication date: February 19, 2015Inventors: Alexander Thulin, Jan Y. Jonsson, Mats Liljas, Rachel Pettersson, Jan-Olof Andersson, Staffan Hertzman
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Publication number: 20140219856Abstract: The invention relates a duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the balanced pitting resistance equivalent. The duplex stainless steel contains less than 0.04 weight % carbon, less than 0.7 weight % silicon, less than 2.5 weight % manganese, 18.5-22.5 weight % chromium, 0.8-4.5 weight % nickel, 0.6-1.4 weight % molybdenum, less than 1 weight % copper, 0.10-0.24 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels.Type: ApplicationFiled: September 5, 2012Publication date: August 7, 2014Applicant: OUTOKUMPU OYJInventors: James Oliver, Jan Y. Jonsson, Alexander Thulin
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Publication number: 20140041766Abstract: The invention relates to a method for manufacturing a ferritic-austenitic stainless steel having good formability, good weldability and high elongation. The stainless steel containing the sum of carbon and nitrogen C+N in the range 0.17-0.295 in weight % in which sum C+N a lower carbon content to avoid sensitisation during welding is compensated by an increased nitrogen content to maintain formability is heat treated so that the microstructure of the stainless steel contains 45-75% austenite in the heat treated condition, the remaining microstructure being ferrite, and the measured Md30 temperature of the stainless steel is adjusted between 0 and 50° C. in order to utilize the transformation induced plasticity (TRIP) for improving the formability of the stainless steel.Type: ApplicationFiled: April 18, 2012Publication date: February 13, 2014Applicant: OUTOKUMPU OYJInventors: James Oliver, Jan Y. Jonsson, Juho Talonen, Rachel Petersson, Jan-Olof Andersson
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Publication number: 20130032256Abstract: The invention relates to a method for manufacturing a ferritic-austenitic stainless steel having good formability and high elongation. The stainless steel is heat treated so that the microstructure of the stainless steel contains 45-75% austenite in the heat treated condition, the remaining microstructure being ferrite, and the measured Md30 temperature of the stainless steel is adjusted between 0 and 50° C. in order to utilize the transformation induced plasticity (TRIP) for improving the formability of the stainless steel.Type: ApplicationFiled: April 18, 2011Publication date: February 7, 2013Applicant: OUTOKUMPU OYJInventors: James Oliver, Jan Y. Jonsson, Juho Talonen