Patents by Inventor Tommi LIIMATAINEN
Tommi LIIMATAINEN 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: 20230235425Abstract: A hot-rolled strip steel product is described having a chemical composition consisting of, in terms of weight percentages (wt. %): 0.030%-0.10% C, 0%-1.10% Si, 0.50%-2.0% Mn, <0.020% P, <0.010% S,<0.010% N, 0%-0.60% Cr, 0%-0.20% Ni, 0%-0.25% Cu, 0%-0.30% Mo, 0%-0.15% Al, 0%-0.10% Nb, 0.10%-0.30% V, <0.020% Ti, 0%-0.0010% B, remainder being Fe and inevitable impurities, wherein the hot rolled strip steel product has a a microstructure comprising, in terms of volume percentages (vol. %), ferrite?90, wherein the ferrite structure comprises bainite, at least 50% of polygonal ferrite and at most 10% quasi-polygonal ferrite, and wherein the steel strip product has an average hole expansion ratio?50%, a yield strength (Rp0.2%) longitudinal to rolling direction of ?660 MPa and a tensile strength?760 MPa.Type: ApplicationFiled: May 20, 2021Publication date: July 27, 2023Inventors: Vili Kesti, Ari Hirvi, Tommi Liimatainen, Mikko Hemmilä, Pasi Suikkanen, Erik Nymann, Martin Lind, Robin Nilsson, Juha Pyykkönen
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Publication number: 20230235420Abstract: A hot-rolled strip steel product having a chemical composition consisting of, in terms of weight percentages (wt. %): 0.025%-0.070% C, 0%-1.10% Si, 0.50%-2.0% Mn, <0.020% P, <0.050% S, <0.010% N, 0%-0.60% Cr, 0%-0.20% Ni, 0%-0.25% Cu, 0%-0.20% Mo, 0%-0.15% Al, 0%-0.050% Nb, 0.020%-0.20-% V, 0.020%-0.15% Ti, 0%-0.0010% B, remainder Fe and inevitable impurities, wherein the strip steel product has a microstructure comprising of, in terms of volume percentages (vol. %), ferrite ?90%, wherein the ferrite structure comprises 10%-50% quasi-polygonal ferrite and a reminder of ferrite structure is polygonal ferrite and/or bainite: and wherein the steel strip product has an average ferrite grain size of <10 ?m, an average hole expansion ratio of ?50%, a yield strength (Rp0.2%) longitudinal to rolling direction of ?660 MPa and a tensile strength of ?760 MPa.Type: ApplicationFiled: May 20, 2021Publication date: July 27, 2023Inventors: Vili Kesti, Tommi Liimatainen, Mikko Hemmilä, Pasi Suikkanen, Erik Nymann, Martin Lind, Robin Nilsson, Juha Pyykkönen
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Publication number: 20230203609Abstract: A hot-rolled steel is described having a yield strength (Rp0.2) of at least 1100 MPa along and/or transverse to a rolling direction which has a chemical composition of (in mass-%): C: 0.10-0.2, Si: 0-0.7, Mn: 1.1-2.2, Nb: 0-0.06, Ti: 0-0.15, V: more than 0.03 and ?0.25, Al: 0.01-0.15, B: 0.0005-0.010, Cr: 0.1-1.7, Mo: 0.15-0.8, Cu: 0-1.5, Ni: 0.3-2.5, P: 0-0.015, S: 0-0.008 Zr: 0-0.2, Ca: 0-0.004, the balance Fe and unavoidable impurities, whereby a) when 0.1<C<0.11 then Mn?1.6 and V>0.14 and Mo?0.5 (in mass-%), b) when 0.11?C<0.125 then Mn?1.45 and V?0.13 and Mo?0.35 (in mass-%), c) when 0.125?C<0.15, then Mn?1.35 and V?0.12 and Mo?0.20 (in mass-%), and d) when C?0.15 and V>0.11, then Mn?1.3 and Mo?0.15 (in mass-%) or when C?0.15 and V 0.03-0.11, then Mn>1.3 and Mo>0.15 and Nb>0.02 and Cr+Cu+Ni>1.4 (in mass-%).Type: ApplicationFiled: January 16, 2019Publication date: June 29, 2023Inventors: Tommi Liimatainen, Mikko Hemmilä, Ari Hirvi, Teijo Limnell, Tuomo Saarinen, Tuomas Antola, Pasi Lehtikangas, Sakari Tihinen, Vili Kesti, Saija Martinmäki
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Patent number: 11572603Abstract: Disclosed is a hot-rolled steel strip having a tensile strength greater than 875 MPa and containing in mass-%: C 0.06-0.12, Si 0-0.5, Mn 0.70-2.20, Nb 0.005-0.100, Ti 0.01-0.10, V 0.11-0.40, whereby the total amount of V+Nb+Ti is 0.20-0.40 Al 0.005-0.150, B 0-0.0008, Cr 0-1.0, whereby the total amount of Mn+Cr is 0.9-2.5, Mo 0-0.5, Cu 0-0.5, Ni 0-1.0, P 0-0.05, S 0-0.01, Zr 0-0.1 Co 0-0.1 W 0-0.1 Ca 0-0.005, N 0-0.01, balance Fe and unavoidable impurities, and having a microstructure at ¼ thickness that is: at least 90% martensite and bainite with island-shaped martensite-austenite (MA) constituents, the remainder being: less than 5% polygonal ferrite and quasi-polygonal ferrite, less than 5% pearlite, less than 5% austenite, so that the total area percentage is 100%.Type: GrantFiled: November 13, 2019Date of Patent: February 7, 2023Assignee: SSAB TECHNOLOGY ABInventors: Mikko Hemmilä, Tommi Liimatainen, Ari Hirvi
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Patent number: 11505841Abstract: A high-strength steel product is described that includes a composition consisting of, in terms of weight percentages, 0.02% to 0.05% C, 0.1% to 0.6% Si, 1.1% to 2.0% Mn, 0.01% to 0.15% Al, 0.01% to 0.08% Nb, 0.5% or less Cu, 0.5% or less Cr, 0.7% or less Ni, 0.03% or less Ti, 0.1% or less Mo, 0.1% or less V, 0.0005% or less B, 0.015% or less P, 0.005% or less S, and the remainder being Fe and inevitable impurities, wherein the steel product has a microstructure comprising a matrix consisting of, in terms of volume percentages, 40% to 80% quasi-polygonal ferrite, 20% to 40% polygonal ferrite, 20% or less bainite, and the remainder being pearlite and martensite of 20% or less.Type: GrantFiled: December 11, 2019Date of Patent: November 22, 2022Assignee: SSAB TECHNOLOGY ABInventors: Jouni Tast, Teppo Pikkarainen, Tommi Liimatainen, Kati Rytinki
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Publication number: 20220177996Abstract: Described is a hot-rolled steel strip product that includes a composition consisting of, in terms of weight percentages, 0.17% to 0.38% C, 0% to 0.5% Si, 0.1% to 0.4% Mn, 0.015% to 0.15% Al, 0.1% to 0.6% Cu, 0.2% to 0.8% Ni, 0.1% to 1% Cr, 0.01% to 0.3% Mo, 0% to 0.005% Nb, 0% to 0.05% Ti, 0% to 0.2% V, 0.0008% to 0.005% B, 0% to 0.025% P, 0.008% or less S, 0.01% or less N, 0% to 0.01% Ca, and the remainder being Fe and inevitable impurities, wherein the steel product has a Brinell hardness in the range of 420-580 HBW, and a corrosion index (ASTM G101-04) of at least 5.Type: ApplicationFiled: April 2, 2020Publication date: June 9, 2022Inventors: Mikko Hemmilä, Tommi Liimatainen, Esa Virolainen, Pasi Suikkanen, Magnus Larsson, Magnus Gladh
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Publication number: 20220177997Abstract: Described is a hot-rolled steel strip product including a composition consisting of, in terms of weight percentages, 0.14% to 0.35% C, 0% to 0.5% Si, 0.05% to 0.40% Mn, 0.1% or less Al, 0.1% to 0.4% Cu, 0.2% to 0.9% Ni, 0.2% to 0.9% Cr, 0.2% or less Mo, 0.005% or less Nb, 0.035% or less Ti, 0.05% or less V, 0.0005% to 0.0050% B, 0.025% or less P, 0.008% or less S, 0.01% or less N, 0.01% or less Ca, and the remainder being Fe and inevitable impurities, wherein the steel product has a Brinell hardness in the range of 420 to 580 HBW.Type: ApplicationFiled: April 2, 2020Publication date: June 9, 2022Inventors: Magnus Larsson, Magnus Gladh, Mikko Hemmilä, Tommi Liimatainen, Esa Virolainen, Pasi Suikkanen
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Publication number: 20220106654Abstract: Disclosed is a high-strength steel product comprising a composition consisting of, in terms of weight percentages, 0.02% to 0.05% C, 0.1% to 0.6% Si, 1.1% to 2.0% Mn, 0.01% to 0.15% Al, 0.01% to 0.08% Nb, 0.5% or less Cu, 0.5% or less Cr, 0.7% or less Ni, 0.03% or less Ti, 0.1% or less Mo, 0.1% or less V, 0.0005% or less B, 0.015% or less P, 0.005% or less S, and the remainder being Fe and inevitable impurities, wherein the steel product has a microstructure comprising a matrix consisting of, in terms of volume percentages, 40% to 80% quasi-polygonal ferrite, 20% to 40% polygonal ferrite, 20% or less bainite, and the remainder being pearlite and martensite of 20% or less. The steel product has a yield strength of at least 400 MPa, an ultimate tensile strength of at least 500 MPa, and a Charpy-V impact toughness of at least 34 J/cm2 at a temperature in the range of ?50° C. to ?100° C.Type: ApplicationFiled: December 11, 2019Publication date: April 7, 2022Inventors: Jouni Tast, Teppo Pikkarainen, Tommi Liimatainen, Kati Rytinki
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Publication number: 20220002836Abstract: Disclosed is a hot-rolled steel strip having a tensile strength greater than 875 MPa and containing in mass-%: C 0.06-0.12, Si 0-0.5, Mn 0.70-2.20, Nb 0.005-0.100, Ti 0.01-0.10, V 0.11-0.40, whereby the total amount of V+Nb+Ti is 0.20-0.40 Al 0.005-0.150, B 0-0.0008, Cr 0-1.0, whereby the total amount of Mn+Cr is 0.9-2.5, Mo 0-0.5, Cu 0-0.5, Ni 0-1.0, P 0-0.05, S 0-0.01, Zr 0-0.1 Co 0-0.1 W 0-0.1 Ca 0-0.005, N 0-0.01, balance Fe and unavoidable impurities, and having a microstructure at ¼ thickness that is: at least 90% martensite and bainite with island-shaped martensite-austenite (MA) constituents, the remainder being: less than 5% polygonal ferrite and quasi-polygonal ferrite, less than 5% pearlite, less than 5% austenite, so that the total area percentage is 100%.Type: ApplicationFiled: November 13, 2019Publication date: January 6, 2022Inventors: Mikko Hemmilä, Tommi Liimatainen, Ari Hirvi
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Patent number: 10837079Abstract: The present invention relates to thin hot-rolled ultrahigh strength steel (UHSS) products, i.e. to hot-rolled steel strips with ultrahigh strength and good bendability. The object of the present invention is to provide an ultrahigh strength hot-rolled steel product that is having yield strength Rp0.2 at least 840 MPa and improved bendability. Further, a preferred aim is also to achieve an ultrahigh strength steel strip with excellent low temperature impact toughness. The inventors of the present invention have surprisingly found that the bendability of directly quenched ultrahigh strength steel strip can be significantly improved by producing a microstructure comprising upper bainite as main phase and by having a hot-rolled steel strip product having a yield strength Rp0.2 at least 840 MPa and a thickness of less than 12 mm, whose composition in percentage by weight is C: 0.03-0.08, Si: 0.01-0.8, Mn: 0.8-2.5, Al: 0.01-0.15, Cr: 0.01-2.0, B: 0.0005-0.005 Nb: 0.005-0.07, Ti: 0.005-0.12, N:<0.01, P:<0.Type: GrantFiled: January 23, 2015Date of Patent: November 17, 2020Assignee: RAUTARUUKKI OYJInventors: Tommi Liimatainen, Mikko Hemmilä, Pasi Suikkanen, Juha Erkkilä, Kati Rytinki, Tuomo Saarinen, Teijo Limnell
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Publication number: 20190368014Abstract: Disclosed is a hardenable steel composition, hardened steel components made from the same, and methods for forming the same. The steel contains relatively high levels of molybdenum in comparison to chromium, silicon and manganese, with the molybdenum providing an excellent combination of hardness and impact strength in the hardened steel. The steel can be cold formed then reheat-quench hardened with water as the quenching agent with no cracking and optionally no tempering. The steels formed have Vickers hardness levels of over 630 Hv10 (e.g. over 700 Hv10), and impact strengths of over 3 J/cm2 (e.g. over 20 J/cm2).Type: ApplicationFiled: January 26, 2018Publication date: December 5, 2019Inventor: Tommi Liimatainen
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Publication number: 20160333440Abstract: The present invention relates to thin hot-rolled ultrahigh strength steel (UHSS) products, i.e. to hot-rolled steel strips with ultrahigh strength and good bendability. The object of the present invention is to provide an ultrahigh strength hot-rolled steel product that is having yield strength Rp0.2 at least 840 MPa and improved bendability. Further, a preferred aim is also to achieve an ultrahigh strength steel strip with excellent low temperature impact toughness. The inventors of the present invention have surprisingly found that the bendability of directly quenched ultrahigh strength steel strip can be significantly improved by producing a microstructure comprising upper bainite as main phase and by having a hot-rolled steel strip product having a yield strength Rp0.2 at least 840 MPa and a thickness of less than 12 mm, whose composition in percentage by weight is C: 0.03-0.08, Si: 0.01-0.8, Mn: 0.8-2.5, Al: 0.01-0.15, Cr: 0.01-2.0, B: 0.0005-0.005 Nb: 0.005-0.07, Ti: 0.005-0.12, N:<0.01, P:<0.Type: ApplicationFiled: January 23, 2015Publication date: November 17, 2016Inventors: Tommi LIIMATAINEN, Mikko HEMMILÄ, Pasi SUIKKANEN, Juha ERKKILÄ, Kati RYTINKI, Tuomo SAARINEN, Teijo LIMNELL