Patents by Inventor Mats Liljas
Mats Liljas 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: 9856551Abstract: A ferritic-austenitic stainless steel having a microstructure containing 35-65 vol-% ferrite and 35-65 vol-% austenite has a chemical composition which contains in weight-%: 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, optionally Mo and/or W in a total amount of max 1.0 (Mo+W/2), optionally Cu up to max 1.0 Cu, 0.15-0.30 N, balance iron and impurities. The following conditions apply for the chromium and nickel equivalents: 20<Creq<24.5, 10<Nieq, where Creq=Cr+1.5 Si+Mo+2 Ti+0.5 Nb, and Nieq=Ni+0.5 Mn+30 (C+N)+0.5 (Cu+Co).Type: GrantFiled: May 29, 2015Date of Patent: January 2, 2018Assignee: OUTOKUMPU STAINLESS AKTIEBOLAGInventors: Elisabeth Alfonsson, Jun Wang, Mats Liljas, Per Johansson
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Patent number: 9822434Abstract: The invention relates to a duplex stainless steel having austenitic-ferritic microstructure of 35-65% by volume, preferably 40-60% by volume of ferrite and having good weldability, good corrosion resistance and good hot workability. The steel contains 0.005-0.04% by weight carbon, 0.2-0.7% by weight silicon, 2.5-5% by weight manganese, 23-27% by weight chromium, 2.5-5% by weight nickel, 0.5-2.5% by weight molybdenum, 0.2-0.35% by weight nitrogen, 0.1-1.0% by weight copper, optionally less than 1% by weight tungsten, less than 0.0030% by weight one or more elements of the group containing boron and calcium, less than 0.1% by weight cerium, less than 0.04% by weight aluminium, less than 0.010% by weight sulphur and the rest iron with incidental impurities.Type: GrantFiled: December 17, 2009Date of Patent: November 21, 2017Assignee: Outokumpu OyjInventors: Peter Samuelsson, Simon Lille, Jan-Olof Andersson, Mats Liljas, Erik Schedin, Pelle Johansson
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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: 20150259772Abstract: A ferritic-austenitic stainless steel having a microstructure which essentially consists of 35-65 vol-% ferrite and 35-65 vol-% austenite has a chemical composition which contains in weight-%: 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, optionally Mo and/or W in a total amount of max 1.0 (Mo+W/2), optionally Cu up to max 1.0 Cu, 0.15-0.30 N, balance iron and impurities. The following conditions shall apply for the chromium and nickel equivalents: 20<Creq<24.5, 10<Nieq, where Creq=Cr+1.5 Si+Mo+2 Ti+0.5 Nb, and Nieq=Ni+0.5 Mn+30 (C+N)+0.5 (Cu+Co).Type: ApplicationFiled: May 29, 2015Publication date: September 17, 2015Inventors: Elisabeth Alfonsson, Jun WANG, Mats LILJAS, Per JOHANSSON
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Publication number: 20150252529Abstract: A suction roll shell having a plurality of through holes is made of a stainless ferrite-austenite steel having a micro-structure essentially consisting of 35-65% by volume of ferrite and 35-65% by volume of austenite. The steel has a composition containing, among other things, 0.005-0.07 C and 0.15-0.30 N, in % by weight.Type: ApplicationFiled: May 22, 2015Publication date: September 10, 2015Applicant: OUTOKUMPU OYJInventors: Mats LILJAS, Pelle JOHANSSON, Conny BERGKVIST
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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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Patent number: 8119063Abstract: High-alloy austenitic stainless steels that are extra resistant to pitting and crevice corrosion in aggressive, chloride-containing solutions have a tendency for macro-segregation of Mo, at solidification of the melt. This problem is solved by a super austenite stainless steel having the following composition, in % by weight: max 0.03 C, max 0.5 Si, max 6 Mn, 28-30 Cr, 21-24 Ni, 4-6% (Mo+W/2), the content of W being max 0.7, 0.5-1.1 N, max 1.0 Cu, balance iron and impurities at normal contents originating from the production of the steel.Type: GrantFiled: December 28, 2005Date of Patent: February 21, 2012Assignee: Outokumpu OyjInventors: Hachemi Loucif, Mats Liljas
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Publication number: 20110250088Abstract: The invention relates to a duplex stainless steel having austenitic-ferritic microstructure of 35-65% by volume, preferably 40-60% by volume of ferrite and having good weldability, good corrosion resistance and good hot workability. The steel contains 0.005-0.04% by weight carbon, 0.2-0.7% by weight silicon, 2.5-5% by weight manganese, 23-27% by weight chromium, 2.5-5% by weight nickel, 0.5-2.5% by weight molybdenum, 0.2-0.35% by weight nitrogen, 0.1-1.0% by weight copper, optionally less than 1% by weight tungsten, less than 0.0030% by weight one or more elements of the group containing boron and calcium, less than 0.1% by weight cerium, less than 0.04% by weight aluminium, less than 0.010% by weight sulphur and the rest iron with incidental impurities.Type: ApplicationFiled: December 17, 2009Publication date: October 13, 2011Applicant: OUTOKUMPU OYJInventors: Peter Samuelsson, Simon Lille, Jan-Olof Andersson, Mats Liljas, Erik Schedin, Pelle Johansson
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Publication number: 20110064601Abstract: The invention relates to a stainless steel product, particularly to a duplex stainless steel casting with high machinability, to the use of the product and to the method to produce the product. The product contains in weight percent up to 0.07% carbon, up to 2% silicon, 3-8% manganese, 19-23% chromium, 0.5-1.7% nickel, up to 1% of molybdenum and/or tungsten with the formula (Mo+½W) less than 1%, up to 1% copper and 0.15-0.30% nitrogen, the remainder being iron and incidental impurities.Type: ApplicationFiled: May 14, 2009Publication date: March 17, 2011Applicant: OUTOKUMPU OYJInventors: Mats Liljas, Jan Olsson, Peter Samuelsson, Mikael willför
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Publication number: 20100172785Abstract: A ferritic-austenitic stainless steel having a microstructure which essentially consists of 35-65 vol-% ferrite and 35-65 vol-% austenite, has a chemical composition which contains in weight-%: 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, optionally Mo and/or W in a total amount of max 1.0 (Mo+W/2), optionally Cu up to max 1.0 Cu, 0.15-0.30 N, balance iron and impurities. The following conditions shall apply for the chromium and nickel equivalents: 20<Creq<24.5, 10<Nieq, where, Creq=Cr+1.5 Si+Mo+2 Ti+0.5 Nb, Nieq=Ni+0.5 Mn+30 (C+N)+0.5 (Cu+Co).Type: ApplicationFiled: December 23, 2009Publication date: July 8, 2010Applicant: Outokumpu Stainless AktiebolagInventors: Elisabeth Alfonsson, Jun Wang, Mats Liljas, Per Johansson
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Publication number: 20080095656Abstract: High-alloy austenitic stainless steels that are extra resistant to pitting and crevice corrosion in aggressive, chloride-containing solutions have a tendency for macro-segregation of Mo, at solidification of the melt. This problem is solved by a super austenite stainless steel having the following composition, in % by weight: max 0.03 C, max 0.5 Si, max 6 Mn, 28-30 Cr, 21-24 Ni, 4-6% (Mo+W/2), the content of W being max 0.7, 0.5-1.1 N, max 1.0 Cu, balance iron and impurities at normal contents originating from the production of the steel.Type: ApplicationFiled: December 28, 2005Publication date: April 24, 2008Applicant: OUTOKUMPU OYJInventors: Hachemi Loucif, Mats Liljas
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Publication number: 20070248484Abstract: A suction roll shell having a plurality of through holes is made of a stainless ferrite-austenite steel having a micro-structure essentially consisting of 35-65% by volume of ferrite and 35-65% by volume of austenite. The steel has a composition containing, among other things, 0.005-0.07 C and 0.15-0.30 N, in % by weight.Type: ApplicationFiled: August 19, 2005Publication date: October 25, 2007Inventors: Mats Liljas, Pelle Johansson, Conny Bergkvist
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Publication number: 20030172999Abstract: A ferritic-austenitic stainless steel having a microstructure which essentially consists of 35-65 vol-% ferrite and 35-65 vol-% austenitc has a chemical composition which contains in weight-%: 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, optionally Mo and/or W in a total amount of max 1.0 (Mo+W/2), optionally Cu up to max 1.0 Cu, 0.15-0.30 N, balance iron and impurities. The following conditions shall apply for the chromium and nickel equivalents: 20<Creq<24.5, 10<Nieq, where (Creq=Cr+1.5 Si+Mo+2 Ti+0.5 Nb, and Nieq=Ni+0.5 Mn+30 (C+N)+0.5 (Cu+Co).Type: ApplicationFiled: April 24, 2003Publication date: September 18, 2003Inventors: Elisabeth Alfonsson, Jun Wang, Mats Liljas, Per Johansson
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Patent number: 5877287Abstract: In a method for producing gelatin from collagen-containing raw material, the raw material is ground and mixed with water to form a slurry; the slurry is treated with an acid and heated in order to expose the collagen in the raw material; the pH and the temperature of the slurry are adjusted once more; the slurry is separated into a liquid portion and a solid residue; and the gelatin is recovered from the liquid portion.Type: GrantFiled: September 19, 1995Date of Patent: March 2, 1999Assignee: Ellco Food ABInventors: Mats Lilja, Mats Larsson
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Patent number: 5196073Abstract: A stainless steel having a two-phase structure of austenite and ferrite, the steel consisting essentially of in weight-% not more than 0.03% C, not more than 0.03% N, the total amount of C+N not being more than 0.05%, 1.5-2.5% Si, 0.5-2% Mn, not more than 0.03% P, not more than 0.010% S, 22-26% Cr, 8-11% Ni, 2-3% Mo, 0.35-0.55% Ti, % Cr+3.3.times.% Mo being at least 29.0, balance iron and impurities, said steel having been subjected to a heat treatment consisting of solution annealing in the temperature range 1100.degree.-1250.degree. C. and water quenching followed by aging in a temperature range 500.degree.-600.degree. C. for at least 30 min, wherein precipitates consisting essentially of Ni.sub.16 Ti.sub.6 Si.sub.7, so called G-phase, are precipitated in the form of particles evenly distibuted in the ferrite, said particles typically having a size of 10-50 .ANG.Type: GrantFiled: April 1, 1992Date of Patent: March 23, 1993Assignee: Avesta AktiebolagInventors: Mats Liljas, Jaroslav Pleva, Peter Stenvall
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Patent number: 5141705Abstract: The invention relates to an austenitic stainless steel having a high tensile strength, a high impact strength, a good weldability and a high corrosion resistance, particularly a high resistance to pitting and crevice corrosion. The steel contains in weight-%:max 0.08 Cmax 1.0 Simore than 0.5 but less than 6 Mnmore than 19 but not more than 28 Crmore than 17 but not more than 25 Nimore than 7 but not more than 10 Mo0.4-0.7 Nfrom traces up to 2 Cu0-0.2 Cebalance essentially only iron, impurities and accessory elements in normal amounts.Type: GrantFiled: January 3, 1991Date of Patent: August 25, 1992Assignee: Avesta AktiebolagInventors: Peter Stenvall, Mats Liljas, Bengt Wallen
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Patent number: 4078920Abstract: An austenitic stainless steel alloy having a high molybdenum content consisting essentially of up to 0.08% carbon, 0.01-0.8% silicon, 0.2-2.0% manganese, 17-25% chromium, 15-21% nickel, 6-10% molybdenum, 0.06-0.25% nitrogen and 0-2.0% copper and the balance of the contents of said alloy being iron with residual impurities. The alloys of the present invention have improved corrosion resistance and improved hot and cold ductility.Type: GrantFiled: January 28, 1977Date of Patent: March 14, 1978Assignee: Avesta Jernverks AktiebolagInventors: Mats Liljas, Jan Ingemar Fridberg, Hasse Sigverd Fredriksson