Patents Examined by Jenny R Wu
  • Patent number: 11401573
    Abstract: A ferritic stainless steel sheet having excellent corrosion resistance, formability, and ridging resistance and a method for manufacturing the same are provided. A ferritic stainless steel sheet has a chemical composition containing, in terms of mass %, C: 0.005 to 0.030%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 10.8 to 14.4%, Ni: 0.01 to 2.50%, and N: 0.005 to 0.060%, with the balance being Fe and incidental impurities. The elongation after fracture is 28% or more, and the ridging height of a surface of a steel sheet to which a tensile strain of 23% has been applied in a rolling direction is 3.0 ?m or less.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: August 2, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Shuji Nishida, Tomohiro Ishii, Masataka Yoshino, Mitsuyuki Fujisawa
  • Patent number: 11396680
    Abstract: Steel for coiled tubing with a low yield ratio and ultra-high strength and a preparation method thereof, wherein the chemical composition of the steel in mass percentage is: C: 0.05-0.16%, Si: 0.1-0.9%, Mn: 1.25-2.5%, P?0.015%, S?0.005%, Cr: 0.51-1.30%, Nb: 0.005-0.019%, V: 0.010-0.079%, Ti: 0.01-0.03%, Mo: 0.10-0.55%, Cu: 0.31-0.60%, Ni: 0.31-0.60%, Ca: 0.0010-0.0040%, Al: 0.01-0.05%, N?0.008%, and the rest being Fe and inevitable impurity elements. The chemical composition combines the technologies of low temperature finishing rolling and low temperature coiling to obtain an MA constituent+bainite+ferrite multiphase structure. The steel has a low yield ratio and ultra-high strength with the following specific properties: yield strength?620 MPa, tensile strength?750 MPa, elongation?11%, and yield ratio?0.83, and is suitable for manufacturing coiled tubing with ultra-high strength having a grade of 110 ksi or higher.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: July 26, 2022
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Chuanguo Zhang, Leilei Sun, Lei Zheng, Houjun Pang, Jian Liu, Yong Zhang, Guodong Xu
  • Patent number: 11390929
    Abstract: A method for manufacturing a hot-stamped part includes reheating a steel slab at a temperature of 1,200° C. to 1,250° C., the steel slab including, by wt %, 0.20 to 0.50% carbon (C), 0.05 to 1.00% silicon (Si), 0.10 to 2.50% manganese (Mn), more than 0% and not more than 0.015% phosphorus (P), more than 0% and not more than 0.005% sulfur (S), 0.05 to 1.00% chromium (Cr), 0.001 to 0.009% boron (B), 0.01 to 0.09% titanium (Ti), and a balance of iron (Fe) and inevitable impurities; finish-rolling the reheated steel slab at a temperature of 880° C. to 950° C.; cooling the hot-rolled steel plate without using water, and coiling the cooled steel plate at a temperature of 680° C. to 800° C. to form a hot-rolled decarburized layer on a surface of the steel plate; pickling the coiled steel plate, followed by cold rolling; annealing the cold-rolled steel plate in a reducing atmosphere; plating the annealed steel plate; and hot-stamping the plated steel plate.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: July 19, 2022
    Assignee: Hyundai Steel Company
    Inventors: Byung Gil Yoo, Hyeong Hyeop Do, Chee Woong Song, Hee Joong Lim, Sung Yul Huh
  • Patent number: 11390931
    Abstract: A hot-rolled steel plate has a predetermined chemical composition and a microstructure. In the microstructure, in a plate thickness 1/2 position, an area fraction of martensite is less than 3%, an area fraction of bainitic ferrite is 95% or greater, the bainitic ferrite has an average grain diameter of 6.0 ?m or less, an amount of Nb precipitated as Nb carbonitride is 0.025 mass % or greater, and an amount of Nb precipitated as Nb carbonitride having a grain diameter of 20 nm or greater constitutes 50% or greater of a total mass of the Nb precipitated as Nb carbonitride. The hot-rolled steel plate has a tensile strength of 640 MPa or greater, a yield ratio of 85% or less, a Charpy impact absorbed energy at ?40° C. of 300 J or greater, and a percent ductile fracture (SA value) of 85% or greater as determined by a DWTT test at ?40° C.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: July 19, 2022
    Assignee: JFE Steel Corporation
    Inventors: Hideyuki Kimura, Takeshi Yokota, Satoshi Tsutsumi
  • Patent number: 11359256
    Abstract: Provided are a high-strength cold-rolled steel sheet that has a tensile strength of 1320 MPa or more, excellent ductility and stretch flangeability, and a low failure rate in a hole expanding test, and a method for manufacturing the same. A high-strength cold-rolled steel sheet comprises a specific composition, wherein a total area ratio of ferrite and bainitic ferrite is 10% to 50%, an area ratio of retained austenite (RA) is more than 15% and 50% or less, an area ratio of tempered martensite is more than 15% and 60% or less, a ratio of RA with an aspect ratio of 0.6 or less is 70% or more, a ratio of RA with an aspect ratio of 0.6 or less in ferrite grain boundaries is 50% or more, and an average KAM value of bcc phase is 1° or less.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: June 14, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Takaaki Tanaka, Yuki Toji
  • Patent number: 11359262
    Abstract: A product comprising recycled metal fragments and an alloying supplement, and methods and system for producing same. In some examples, the product comprises a container, shot blasted pieces of aluminum alloy wheels and an alloying supplement. In some examples, the product also comprises an indication on the container of a composition estimate of the combined shot blasted pieces and alloying supplement. In other examples, the indication and/or the alloying supplement may be provided by a company in the business of providing alloying supplements.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: June 14, 2022
    Assignee: House of Metals Company Limited
    Inventor: Daniel Bitton
  • Patent number: 11352680
    Abstract: An apparatus and a method for rapidly heating cold-rolled strip steel (10). The apparatus for rapidly heating cold-rolled strip steel (10) comprises a heating zone, a soaking zone, and a cooling zone, and the heating zone is sequentially divided into a first heating section (1), a second heating section (2), a third heating section (3), and a fourth heating section (4) along a moving direction of the strip steel (10) to be heated, the first heating section (1) and the fourth heating section (4) being radiant heating sections, and the second heating section (2) and the third heating section (3) being inductive heating sections. The method for rapidly heating cold-rolled strip steel (10) uses the apparatus for rapidly heating cold-rolled strip steel (10) to heat the strip steel (10).
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: June 7, 2022
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Huabing Zhang, Guobao Li, Baojun Liu, Dan Han, Xinqiang Zhang, Guanghua Cui, Jianbing Chen, Wen Xiao, Zipeng Zhao
  • Patent number: 11352684
    Abstract: The present invention has as its object the provision of a steel member and steel sheet having high tensile strength and toughness and excellent in hydrogen embrittlement resistance in a corrosive environment and methods for manufacturing the same. The steel member of the present invention has predetermined chemical constituents and has a maximum value of content of Cu in a range from the surface to a depth of 0 to 30 ?m of 1.4 times the content of Cu at a depth of 200 ?m.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: June 7, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shinichiro Tabata, Kazuhisa Kusumi, Kazuo Hikida, Hideaki Irikawa
  • Patent number: 11355275
    Abstract: A laser-scribed grain-oriented silicon steel resistant to stress-relief annealing and a manufacturing method therefor. Parallel linear grooves (20) are formed on one or both sides of grain-oriented silicon steel (10) by laser etching. The linear grooves (20) are perpendicular to, or at an angle to, the rolling direction of the steel plate. A maximum height of edge protrusions of the linear grooves (20) does not exceed 5 ?m, and a maximum height of spatters in etch-free regions between adjacent linear grooves (20) does not exceed 5 ?m, and the proportion of an area occupied by spatters in the vicinity of the linear grooves (20) does not exceed 5%. The steel has low manufacturing costs, and the etching effect of the finished steel is retained during a stress-relief annealing process. The steel is suitable for manufacturing of wound iron core transformers.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: June 7, 2022
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Zipeng Zhao, Guobao Li, Yongjie Yang, Meihong Wu, Changsong Ma, Yaming Ji, Chen Ling, Weiyong Xie, Jianguo Guo
  • Patent number: 11345974
    Abstract: A cold rolled steel sheet of the present invention has a specific chemical composition and a steel microstructure in which the average aspect ratio of ferrite crystal grains is 2.0 or less; an rave value that is the average value of values obtained by measuring the r-value represented by a first predetermined formula in three places apart with spacings of 200 mm in the sheet width direction is 1.20 or more, and |?rave| that is the average value of values obtained by measuring, in three places apart with spacings of 200 mm in the sheet width direction, |?r| that is the absolute value of ?r represented by a second predetermined formula is 0.40 or less and the difference between the largest value and the smallest value of |?r| among the three places is 0.15 or less.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: May 31, 2022
    Assignee: JFE Steel Corporation
    Inventors: Lingling Yang, Tatsuya Nakagaito
  • Patent number: 11345973
    Abstract: Provided are a high-strength steel sheet having a yield strength of 550 MPa or more and excellent fatigue-strength of a weld and a method for manufacturing the steel sheet. A high-strength steel sheet has a specified chemical composition, a steel microstructure observed in a cross section in a thickness direction parallel to a rolling direction including 40% to 75% of a martensite phase in terms of volume fraction, in which a total volume fraction of martensite grains whose average grain diameter ratios with respect to adjacent ferrite grains are ¼ or more and 1 or less is 60% or more with respect to an entire martensite phase, and a yield strength (YP) of 550 MPa or more.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: May 31, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Lingling Yang, Tatsuya Nakagaito, Gosuke Ikeda
  • Patent number: 11338549
    Abstract: Provided is a steel sheet for a hot press formed member having excellent resistance to hydrogen delayed fracture, and a method for manufacturing the same. A steel sheet for a hot press formed member comprises: a base steel sheet; an aluminum alloy plating layer on a surface of the base steel sheet; and an oxide layer which is formed on a surface of the plating layer and has a thickness of 0.05 ?m or more.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: May 24, 2022
    Assignee: POSCO
    Inventors: Seong-Woo Kim, Jin-Keun Oh, Yeol-Rae Cho
  • Patent number: 11326237
    Abstract: 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: Grant
    Filed: March 29, 2018
    Date of Patent: May 10, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masaaki Fujioka, Tetsuya Namegawa, Masahide Yoshimura, Masanori Minagawa
  • Patent number: 11326222
    Abstract: The austenitic stainless steel containing niobium according to an exemplary embodiment of the present invention includes: 16 to 26 wt. % of chromium (Cr), 8 to 22 wt. % of nickel (Ni), 0.02 to 0.1 wt. % of carbon (C), 0.2 to 1 wt. % of niobium (Nb), 0.015 to 0.025 wt. % of titanium (Ti), 0.004 to 0.01 wt. % of nitrogen (N), and 0.5 to 2 wt. % of manganese (Mn), wherein the austenitic stainless steel containing niobium has an austenitic matrix structure, a fine niobium carbide and a fine titanium nitride are precipitated in the austenitic matrix structure, and the fine niobium carbide is uniformly dispersed in the austenitic matrix structure.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: May 10, 2022
    Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Chang-Heui Jang, Ji Ho Shin, Byeong Seo Kong, Ho-Sub Kim, Hyeon Bae Lee
  • Patent number: 11326240
    Abstract: There is provided a hot-rolled steel sheet suitable for manufacturing an electric resistance welded steel tube, having workability necessary for roll forming and high yield strength, for coiled tubing without performing whole-tube quenching treatment and reheating-tempering treatment after electric resistance welding. The steel sheet includes, by mass %, C, Si, Mn, P, S, Al, Cr, Cu, Ni, Mo, Nb, V, Ti, and N contained at a specific content. The steel sheet has a microstructure containing 3% to 20% martensite and 10% or less retained austenite on a volume fraction basis, the remainder being bainite. The yield strength is set to 600 MPa or more, the tensile strength is set to 950 MPa or more, and the uniform elongation is set to 7.0% or more.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: May 10, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Akihide Matsumoto, Hiroshi Nakata, Shunsuke Toyoda
  • Patent number: 11319623
    Abstract: A method for producing a steel strip with an aluminium alloy coating layer in a continuous coating process. Also, a steel strip coated with an aluminium alloy coating layer that can be produced in accordance with the method, the use of such a coated steel strip and the product made by using the coated steel strip.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: May 3, 2022
    Assignee: TATA STEEL IJMUIDEN B.V.
    Inventors: Hugo Van Schoonevelt, Guido Cornelis Hensen
  • Patent number: 11319609
    Abstract: Steel for a crankshaft includes 0.37 to 0.42 wt % of carbon (C), 0.55 to 0.70 wt % of silicon (Si), 1.45 to 1.65 wt % of manganese (Mn), 0.025 wt % or less (excluding 0 wt %) of phosphorus (P), 0.020 to 0.035 wt % of sulfur (S), 0.15 to 0.30 wt % of chromium (Cr), 0.035 to 0.055% of vanadium (V), and the remainder of Fe and other inevitable impurities. The steel for a crankshaft has strength that is maintained high even when reducing the amount of vanadium.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: May 3, 2022
    Assignees: Hyundai Motor Company, Kia Motors Corporation, Hyundai Steel Company
    Inventors: Sung Hwan Kim, Chan Woo Kim
  • Patent number: 11313021
    Abstract: A hot dipped medium manganese steel and a manufacturing method therefor. The medium manganese steel comprises a steel base plate and a coating on the surface of the steel base plate; the mass percentages of the components in the hot dipped medium manganese steel are: C: 0.1 to 0.3%, Si: 0.1 to 2.0%, Mn: 5 to 12%, Al: 1 to 2%, P?0.02%, S?0.02%, N?0.005%, and the remaining being Fe and unavoidable impurities; the core structure is ferrite and austenite, and the surface layer of the steel base plate is a ferrite layer.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: April 26, 2022
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Xinyan Jin, Yulong Zhang, Guangkui Hu
  • Patent number: 11306368
    Abstract: The present invention belongs to the technical field of alloy materials, and particularly relates to high pressure and corrosion resistant steel and a preparation method and an application thereof. The high pressure and corrosion resistant steel provided by the present invention has a tensile strength of 1,020-1,100 MPa, a yield strength of 980-1,050 MPa, an elongation of 20%-22%, a reduction of area of 60%-80%, and impact energy of more than 100 J at a low temperature of 40° C., and has excellent high pressure and corrosion resistance.
    Type: Grant
    Filed: August 28, 2019
    Date of Patent: April 19, 2022
    Assignee: SHANGHAI QINGHE MACHINERY CO., LTD.
    Inventors: He Wang, Yang Li, Jiegao Fei, Yongliang Xin
  • Patent number: 11286534
    Abstract: A steel alloy including, by weight percent: Ni: 18 to 19%; Co: 11.5 to 12.5%; Mo: 4.6 to 5.2%; Ti: 1.3 to 1.6%; Al: 0.05 to 0.15%; Nb: 0.15 to 0.30%; B: 0.003 to 0.020%; Cr: max 0.25%; Mn: max 0.1%; Si: max 0.1%; C: max 0.03%; P: max 0.005%; and S: max 0.002%, the balance being iron plus incidental impurities.
    Type: Grant
    Filed: July 16, 2019
    Date of Patent: March 29, 2022
    Assignee: The Boeing Company
    Inventors: Daniel E. Sievers, Peter J. Bocchini