Patents by Inventor Tetsuya NAMEGAWA
Tetsuya NAMEGAWA 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: 11578394Abstract: A nickel-containing steel for low temperature according to an aspect of the present invention has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 15.0 ?m, an average aspect ratio of the prior austenite grains is 1.0 to 2.4, a plate thickness is 4.5 mm to 30 mm, the chemical composition and the average grain size of the prior austenite grains are further limited depending on the plate thickness, a yield stress at room temperature is 460 MPa to 710 MPa, and a tensile strength at the room temperature is 560 MPa to 810 MPa.Type: GrantFiled: May 23, 2022Date of Patent: February 14, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Tetsuya Namegawa, Manabu Hoshino, Shinichi Omiya, Takayuki Kagaya
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Patent number: 11578391Abstract: A Ni steel has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 12.0 ?m, an average aspect ratio of the prior austenite grains is 2.6 to 10.0, a plate thickness is 4.5 mm to 20 mm, a yield stress at room temperature is 590 MPa to 710 MPa, and a tensile strength at the room temperature is 690 MPa to 810 MPa, when the plate thickness is more than 16 mm, the Ni steel contains Ni: 11.5% or more, and when the plate thickness is 16 mm or less and the Ni steel contains Ni: less than 11.5%, the average grain size of the prior austenite grains is 6.0 ?m or less.Type: GrantFiled: May 23, 2022Date of Patent: February 14, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Tetsuya Namegawa, Manabu Hoshino, Shinichi Omiya, Takayuki Kagaya
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Publication number: 20220282362Abstract: A nickel-containing steel for low temperature according to an aspect of the present invention has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 15.0 ?m, an average aspect ratio of the prior austenite grains is 1.0 to 2.4, a plate thickness is 4.5 mm to 30 mm, the chemical composition and the average grain size of the prior austenite grains are further limited depending on the plate thickness, a yield stress at room temperature is 460 MPa to 710 MPa, and a tensile strength at the room temperature is 560 MPa to 810 MPa.Type: ApplicationFiled: May 23, 2022Publication date: September 8, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Tetsuya NAMEGAWA, Manabu HOSHINO, Shinichi OMIYA, Takayuki KAGAYA
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Publication number: 20220282359Abstract: A Ni steel has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 12.0 ?m, an average aspect ratio of the prior austenite grains is 2.6 to 10.0, a plate thickness is 4.5 mm to 20 mm, a yield stress at room temperature is 590 MPa to 710 MPa, and a tensile strength at the room temperature is 690 MPa to 810 MPa, when the plate thickness is more than 16 mm, the Ni steel contains Ni: 11.5% or more, and when the plate thickness is 16 mm or less and the Ni steel contains Ni: less than 11.5%, the average grain size of the prior austenite grains is 6.0 ?m or less.Type: ApplicationFiled: May 23, 2022Publication date: September 8, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Tetsuya NAMEGAWA, Manabu HOSHINO, Shinichi OMIYA, Takayuki KAGAYA
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Patent number: 11384416Abstract: This nickel-containing steel for low temperature includes, as a chemical composition, by mass %: C: 0.020% to 0.070%; Si: 0.03% to 0.30%; Mn: 0.20% to 0.80%; Ni: 12.5% to 17.4%; Al: 0.010% to 0.060%; N: 0.0015% to 0.0060%; and O: 0.0007% to 0.0030%, in which a metallographic structure contains 2.0% to 30.0% of an austenite phase by volume fraction %, in a thickness middle portion of a section parallel to a rolling direction and a thickness direction, an average grain size of prior austenite grains is 3.0 ?m to 20.0 ?m, and an average aspect ratio of the prior austenite grains is 1.0 to 2.9.Type: GrantFiled: October 26, 2017Date of Patent: July 12, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Manabu Hoshino, Tetsuya Namegawa, Shinichi Omiya, Takayuki Kagaya
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Patent number: 11371121Abstract: A Ni steel has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 12.0 ?m, an average aspect ratio of the prior austenite grains is 2.6 to 10.0, a plate thickness is 4.5 mm to 20 mm, a yield stress at room temperature is 590 MPa to 710 MPa, and a tensile strength at the room temperature is 690 MPa to 810 MPa, when the plate thickness is more than 16 mm, the Ni steel contains Ni: 11.5% or more, and when the plate thickness is 16 mm or less and the Ni steel contains Ni: less than 11.5%, the average grain size of the prior austenite grains is 6.0 ?m or less.Type: GrantFiled: October 26, 2017Date of Patent: June 28, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Tetsuya Namegawa, Manabu Hoshino, Shinichi Omiya, Takayuki Kagaya
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Patent number: 11371127Abstract: A nickel-containing steel for low temperature according to an aspect of the present invention has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 15.0 ?m, an average aspect ratio of the prior austenite grains is 1.0 to 2.4, a plate thickness is 4.5 mm to 30 mm, the chemical composition and the average grain size of the prior austenite grains are further limited depending on the plate thickness, a yield stress at room temperature is 460 MPa to 710 MPa, and a tensile strength at the room temperature is 560 MPa to 810 MPa.Type: GrantFiled: October 26, 2017Date of Patent: June 28, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Tetsuya Namegawa, Manabu Hoshino, Shinichi Omiya, Takayuki Kagaya
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Patent number: 11371126Abstract: This nickel-containing steel for low temperature includes, as a chemical composition, by mass %: C: 0.030% to 0.070%; Si: 0.03% to 0.30%; Mn: 0.10% to 0.80%; Ni: 12.5% to 17.4%; Mo: 0.03% to 0.60%; Al: 0.010% to 0.060%; N: 0.0015% to 0.0060%; and O: 0.0007% to 0.0030%, in which a metallographic structure contains 2.0% to 30.0% of an austenite phase by volume fraction %, in a thickness middle portion of a section parallel to a rolling direction and a thickness direction, an average grain size of prior austenite grains is 3.0 ?m to 20.0 ?m, and an average aspect ratio of the prior austenite grains is 3.1 to 10.0.Type: GrantFiled: October 26, 2017Date of Patent: June 28, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Tetsuya Namegawa, Manabu Hoshino, Shinichi Omiya, Takayuki Kagaya
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Patent number: 11326237Abstract: An austenitic wear-resistant steel plate according to an aspect of the present invention has a predetermined chemical composition, amounts of C and Mn by mass % satisfy ?13.75×C+16.5?Mn??20×C+30, the volume fraction of austenite in a metallographic structure is 40% or more and less than 95%, and the average grain size of the austenite is 40 to 300 ?m.Type: GrantFiled: March 29, 2018Date of Patent: May 10, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Masaaki Fujioka, Tetsuya Namegawa, Masahide Yoshimura, Masanori Minagawa
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Publication number: 20210355569Abstract: An austenitic wear-resistant steel plate according to an aspect of the present invention has a predetermined chemical composition, amounts of C and Mn by mass % satisfy ?13.75×C+16.5?Mn??20×C+30, the volume fraction of austenite in a metallographic structure is 40% or more and less than 95%, and the average grain size of the austenite is 40 to 300 ?m.Type: ApplicationFiled: March 29, 2018Publication date: November 18, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Masaaki FUJIOKA, Tetsuya NAMEGAWA, Masahide YOSHIMURA, Masanori MINAGAWA
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Publication number: 20210189535Abstract: This nickel-containing steel for low temperature includes, as a chemical composition, by mass %: C: 0.020% to 0.070%; Si: 0.03% to 0.30%; Mn: 0.20% to 0.80%; Ni: 12.5% to 17.4%; Al: 0.010% to 0.060%; N: 0.0015% to 0.0060%; and O: 0.0007% to 0.0030%, in which a metallographic structure contains 2.0% to 30.0% of an austenite phase by volume fraction %, in a thickness middle portion of a section parallel to a rolling direction and a thickness direction, an average grain size of prior austenite grains is 3.0 ?m to 20.0 ?m, and an average aspect ratio of the prior austenite grains is 1.0 to 2.9.Type: ApplicationFiled: October 26, 2017Publication date: June 24, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Manabu HOSHINO, Tetsuya NAMEGAWA, Shinichi OMIYA, Takayuki KAGAYA
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Publication number: 20200332384Abstract: This nickel-containing steel for low temperature includes, as a chemical composition, by mass %: C: 0.030% to 0.070%; Si: 0.03% to 0.30%; Mn: 0.10% to 0.80%; Ni: 12.5% to 17.4%; Mo: 0.03% to 0.60%; Al: 0.010% to 0.060%; N: 0.0015% to 0.0060%; and O: 0.0007% to 0.0030%, in which a metallographic structure contains 2.0% to 30.0% of an austenite phase by volume fraction %, in a thickness middle portion of a section parallel to a rolling direction and a thickness direction, an average grain size of prior austenite grains is 3.0 ?m to 20.0 ?m, and an average aspect ratio of the prior austenite grains is 3.1 to 10.0.Type: ApplicationFiled: October 26, 2017Publication date: October 22, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Tetsuya NAMEGAWA, Manabu HOSHINO, Shinichi OMIYA, Takayuki KAGAYA
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Publication number: 20200308678Abstract: A nickel-containing steel for low temperature according to an aspect of the present invention has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 15.0 ?m, an average aspect ratio of the prior austenite grains is 1.0 to 2.4, a plate thickness is 4.5 mm to 30 mm, the chemical composition and the average grain size of the prior austenite grains are further limited depending on the plate thickness, a yield stress at room temperature is 460 MPa to 710 MPa, and a tensile strength at the room temperature is 560 MPa to 810 MPa.Type: ApplicationFiled: October 26, 2017Publication date: October 1, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Tetsuya NAMEGAWA, Manabu HOSHINO, Shinichi OMIYA, Takayuki KAGAYA
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Publication number: 20200291506Abstract: A Ni steel for low temperature according to an aspect of the present invention has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 ?m to 12.0 ?m, an average aspect ratio of the prior austenite grains is 2.6 to 10.0, a plate thickness is 4.5 mm to 20 mm, a yield stress at room temperature is 590 MPa to 710 MPa, and a tensile strength at the room temperature is 690 MPa to 810 MPa, when the plate thickness is more than 16 mm, the Ni steel contains Ni: 11.5% or more, and when the plate thickness is 16 mm or less and the Ni steel contains Ni: less than 11.5%, the average grain size of the prior austenite grains is 6.0 ?m or less.Type: ApplicationFiled: October 26, 2017Publication date: September 17, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Tetsuya NAMEGAWA, Manabu HOSHINO, Shinichi OMIYA, Takayuki KAGAYA