Patents by Inventor Guobao Li

Guobao Li 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).

  • Publication number: 20210101230
    Abstract: A grain-oriented silicon steel with low iron loss, wherein the silicon steel is provided with a plurality of grooves on its surface, each of the grooves is 10-60 ?m in width and 5-40 ?m in depth, and the spacing between adjacent grooves is 1-10 mm. The manufacturing method therefor comprises: scoring the surface of the grain-oriented silicon steel with low iron loss by using a laser in order to form the grooves. The grain-oriented silicon steel with low iron loss can maintain the magnetic domain refining effect in a stress-relief annealing process, and avoid the introduction of more residual stress.
    Type: Application
    Filed: January 24, 2018
    Publication date: April 8, 2021
    Applicant: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Meihong WU, Zipeng ZHAO, Guobao LI, Kanyi SHEN, Zhuochao HU, Chen LING, Huande SUN, Huabing ZHANG
  • Publication number: 20210047706
    Abstract: Disclosed is a manufacturing method for a high silicon grain oriented electrical steel sheet, the silicon content of the high silicon grain oriented electrical steel is greater than 4 wt %, comprising the steps of: (1) performing decarburization annealing of a cold-rolled steel plate; (2) allowing high silicon alloy particles in a completely solid state to collide at a high speed with the surface of the decarburization annealed steel plate to be sprayed, thus forming a high silicon alloy coating on the surface of the steel plate to be sprayed; (3) coating a release agent and drying; and (4) annealing. The manufacturing method for the high silicon grain oriented electrical steel sheet of the present invention is inexpensive, and, the high silicon grain oriented electrical steel sheet produced is of stable quality and is provided with great magnetic performance.
    Type: Application
    Filed: March 25, 2019
    Publication date: February 18, 2021
    Applicant: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Huabing ZHANG, Shuangjie CHU, Guobao LI, Wen XIAO, Baojun LIU, Yongjie YANG, Kanyi SHEN, Dan HAN, Zhining HU
  • Publication number: 20200362433
    Abstract: Disclosed is a method for manufacturing stress-relief-annealing-resistant, low-iron-loss grain-oriented silicon steel, the method comprising: carrying out, by means of a pulse laser, scanning grooving on a single surface or two surfaces of a silicon steel sheet after cold rolling, or after decarburizing annealing, or after high temperature annealing or after hot stretching, temper rolling and annealing, and forming several grooves parallel with each other in a rolling direction of the silicon steel sheet, wherein a single pulse time width of the pulse laser is 100 ns or less, and a single pulse peak energy density is 0.
    Type: Application
    Filed: June 21, 2018
    Publication date: November 19, 2020
    Inventors: Shuangjie CHU, Guobao LI, Yongjie YANG, Zipeng ZHAO, Changsong MA, Kanyi SHEN, Meihong WU, Yaming JI, Huabing ZHANG, Zhuochao HU
  • Publication number: 20200291501
    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: Application
    Filed: May 16, 2018
    Publication date: September 17, 2020
    Applicant: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Huabing ZHANG, Guobao LI, Baojun LIU, Dan HAN, Xinqiang ZHANG, Guanghua CUI, Jianbing CHEN, Wen XIAO, Zipeng ZHAO
  • Publication number: 20200058434
    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: Application
    Filed: January 24, 2018
    Publication date: February 20, 2020
    Applicant: 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: 10566119
    Abstract: The invention discloses an oriented silicon steel with excellent magnetic properties and a manufacturing method thereof. The present invention obtains the oriented silicon steel with excellent magnetic properties by controlling the area ratio of small crystal grains of D<5 mm in an oriented silicon steel finished product to be not more than 3%, and controlling the ratio ?17/?15 of the magnetic conductivity under the magnetic induction of 1.7 T and 1.5 T in the oriented silicon steel finished product to be 0.50 or more.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: February 18, 2020
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Guohua Yang, Xiandong Liu, Guobao Li, Yongjie Yang, Zhuochao Hu, Hongxu Hei, Jun Zhang, Dejun Su, Huande Sun, Meihong Wu
  • Publication number: 20190255657
    Abstract: An oriented silicon steel product with a low iron loss for a low-noise transformer, and manufacturing method thereof are provided. The oriented silicon steel product comprises: a silicon steel substrate, a magnesium silicate bottom layer formed on a surface of the silicon steel substrate, and an insulation coating applied on the magnesium silicate bottom layer. The magnesium silicate bottom layer has a visible light normal reflectivity (R) of 40-60% for. By strictly controlling the visible light normal reflectivity of the magnesium silicate bottom layer of the silicon steel substrate and the evenness of the gloss of magnesium silicate bottom layer, lower iron loss, and reduced magnetostriction can be achieved, and thus a silicon steel product with low noise and particularly suitable for transformers can be obtained.
    Type: Application
    Filed: June 13, 2017
    Publication date: August 22, 2019
    Inventors: ZIPENG ZHAO, CHANGJUN HOU, BANGLIN XIANG, KANYI SHEN, GUOBAO LI, CHEN LING, WEIYONG XIE, YANLI SONG
  • Patent number: 10236105
    Abstract: The invention relates to high magnetic induction oriented silicon steel and a preparation method thereof. The oriented silicon steel comprises the following chemical elements by weight percent: 0.035-0.120% of C, 2.9-4.5% of Si, 0.05-0.20% of Mn, 0.005-0.050% of P, 0.005-0.012% of S, 0.015-0.035% of Als, 0.001-0.010% of N, 0.05-0.30% of Cr, 0.005-0.090% of Sn, not more than 0.0100% of V, not more than 0.0100% of Ti, at least one of trace elements of Sb, Bi, Nb and Mo, and the balance of Fe and other inevitable impurities, wherein Sb+Bi+Nb+Mo is 0.0015-0.0250% and (Sb/121.8+Bi/209.0+Nb/92.9+Mo/95.9)/(Ti/47.9+V/50.9) ranges from 0.1 to 15.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: March 19, 2019
    Assignee: BAOSHAN IRON & STEEL CO., LTD
    Inventors: Huabing Zhang, Guobao Li, Xijiang Lu, Yongjie Yang, Zhuochao Hu, Kanyi Shen, Jiaqiang Gao, Meihong Wu
  • Patent number: 9905361
    Abstract: A manufacturing method of oriented silicon steel with magnetic induction B8 of not less than 1.88 T, comprising the following steps: 1) smelting and continuous casting to obtain a slab, wherein the content of N is controlled at 0.002-0.014 wt % in the smelting stage; 2) hot-rolling; 3) cold-rolling; 4) decarbonizing and annealing; 5) nitriding treatment, wherein infiltrated nitrogen content [N]D is controlled to satisfy the formula: 328?0.14a?0.85b?2.33c?[N]D?362?0.16a?0.94b?2.57c, wherein a is the content of Als in the smelting step, with the unit of ppm; b is the content of N element, with the unit of ppm; and c is primary grains size, with the unit of ?m; 6) coating a steel's surfaces with a magnesium oxide layer and annealing; and 7) applying an insulating coating.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: February 27, 2018
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Kanyi Shen, Guobao Li, Shuangjie Chu, Yezhong Sun, Huabing Zhang, Yongjie Yang, Zhuochao Hu, Bin Zhao, Qi Xu, Jie Huang, Peili Zhang
  • Patent number: 9604312
    Abstract: A fast-speed laser scoring method is provided, in which a set of related laser scoring device is used to simultaneously score lines on the upper surface and the lower surface of an oriented silicon steel strip, which is being fed and traveling forwards on a production line, with high-focalized continuous wave laser beam; the lines scored on the upper surface and the lines scored on the lower surface have the same space between every two adjacent scored lines but are staggered each other in order to reduce iron loss evenly. The space between every two adjacent scored lines on the same surface is 6-12 mm, laser power is 1000-3000 W and scanning speed is 100-400 m/min. The machining rate of the scoring method and device attains 1.5-2 times the one of conventional scoring methods which can not simultaneously score the upper and lower surfaces of a steel strip at a time. The lines scored on a steel strip by the method can reduce iron loss of the strip by 10-16%.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: March 28, 2017
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Wangya Huang, Guobao Li, Xinqiang Zhang, Xing Mao, Wanqing Guo, Jianru Zhu, Banglin Xiang
  • Patent number: 9460054
    Abstract: A method for detecting electromagnetic property of oriented silicon steel, the method comprises: measuring Euler angles of each of crystal grains in a specimen by use of metallographic etch-pit method; calculating orientation deviation angle ?i (degree) of the crystal grain; combining area Si (mm2) of the crystal grain and correction coefficient X of element Si (X=0.1˜10 T/degree); correcting on the basis of the magnetic property B0 (saturation magnetic induction, T) of single-crystal material by using these parameters (?i, Si, X), formula for correcting is B 8 = - 0.015 × X × ? n = 1 i ? S i ? ? ? i ? ? n = 1 i ? S i + ( B 0 - 0.04 ) ( 1 ) obtaining electromagnetic property B8 of the oriented silicon steel by the above calculations.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: October 4, 2016
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Meihong Wu, Weizhong Jin, Huande Sun, Guohua Yang, Kanyi Shen, Jie Huang, Guobao Li
  • Publication number: 20150302962
    Abstract: The invention discloses an oriented silicon steel with excellent magnetic properties and a manufacturing method thereof. The present invention obtains the oriented silicon steel with excellent magnetic properties by controlling the area ratio of small crystal grains of D<5 mm in an oriented silicon steel finished product to be not more than 3%, and controlling the ratio ?17/?15 of the magnetic conductivity under the magnetic induction of 1.7 T and 1.5 T in the oriented silicon steel finished product to be 0.50 or more.
    Type: Application
    Filed: December 11, 2012
    Publication date: October 22, 2015
    Inventors: Guohua YANG, Xiandong LIU, Guobao LI, Yongjie YANG, Zhuochao HU, Hongxu HEI, Jun ZHANG, Dejun SU, Huande SUN, Meihong WU
  • Publication number: 20150255211
    Abstract: A manufacturing method of oriented silicon steel with magnetic induction B8 of not less than 1.88 T, comprising the following steps: 1) smelting and continuous casting to obtain a slab, wherein the content of N is controlled at 0.002-0.014 wt % in the smelting stage; 2) hot-rolling; 3) cold-rolling; 4) decarbonizing and annealing; 5) nitriding treatment, wherein infiltrated nitrogen content [N]D is controlled to satisfy the formula: 328?0.14a?0.85b?2.33c?[N]D?362?0.16a?0.94b?2.57c, wherein a is the content of Als in the smelting step, with the unit of ppm; b is the content of N element, with the unit of ppm; and c is primary grains size, with the unit of ?m; 6) coating a steel's surfaces with a magnesium oxide layer and annealing; and 7) applying an insulating coating.
    Type: Application
    Filed: December 11, 2012
    Publication date: September 10, 2015
    Applicant: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Kanyi Shen, Guobao Li, Shuangjie Chu, Yezhong Sun, Huabing Zhang, Yongjie Yang, Zhuochao Hu, Bin Zhao, Qi Hu, Jie Huang, Peili Zhang
  • Patent number: 9038429
    Abstract: The invention provides a method for producing grain-oriented silicon steel with single cold rolling, comprising: 1) smelting, refining and continuous casting to obtain a casting blank; 2) hot rolling; 3) normalization, i.e. normalizing annealing and cooling; 4) cold-rolling, i.e. single cold rolling at a cold rolling reduction rate of 75-92%; 5) decarburizing annealing at 780-880° C. for 80-350 s in a protective atmosphere having a due point of 40-80° C., wherein the total oxygen [O] in the surface of the decarburized sheet: 171/t?[O]?313/t (t represents the actual thickness of the steel sheet in mm), the amount of absorbed nitrogen: 2-10 ppm; 6) high temperature annealing, wherein the dew point of the protective atmosphere: 0-50° C., the temperature holding time at the first stage: 6-30 h, the amount of absorbed nitrogen during high-temperature annealing: 10-40 ppm; 7) hot-leveling annealing.
    Type: Grant
    Filed: December 31, 2009
    Date of Patent: May 26, 2015
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Guobao Li, Pijun Zhang, Yongjie Yang, Kanyi Shen, Zhuochao Hu, Peiwen Wu, Weizhong Jin, Quanli Jiang
  • Publication number: 20130299049
    Abstract: A method for manufacturing a grain-oriented silicon steel having excellent magnetic performance, comprising steps as follows 1)conventionally melting and casting into a steel blank; 2) heating the steel blank and hot rolling the same into a strip of steel; 3)normalizing process; carrying out the normalizing process having two stages, wherein the strip is firstly heated to 1100˜1200° C., then cooled to 900˜1000° C. within 50˜200 s; and next, the strip is rapidly cooled in water having a temperature of 10-100; in this period, a tension force is applied to the strip of steel, the strip of steel in the temperature range of 900 ° C.˜500° C. has a stress of 1˜200N/mm2; 4)cold rolling, i.e. carrying out a primary cold rolling, or a double cold rolling with intermediate annealing; 5)carrying out primary recrystallizing annealing, then coating an annealing separator, whose main composition is MgO, to carry out final product annealing comprising secondary recrystallizing annealing and purifying annealing.
    Type: Application
    Filed: April 28, 2011
    Publication date: November 14, 2013
    Inventors: Meihong Wu, Weizhong Jin, Huande Sun, Guohua Yang, Kanyi Shen, Jie Huang, Deyang Hu, Guobao Li
  • Publication number: 20130292005
    Abstract: An annealing separator for manufacturing grain-oriented silicon steel with mirror-like surface having good magnetic performance consists of the composition of which is 77˜98 by wt % of Al2O3 powder, 1˜8 by wt % of alkaline earth powder, 1˜15 by wt % of alkali metal chloride and/or alkaline earth metal chloride. The annealing separator of the invention can avoid forming a glass-film undercoating on the surface of the steel sheet during high-temperature annealing, and at the same time, the oxide embedded at near-surface of the sheet is removed by means of corrosive reaction of the chloride, so that a produce with smooth surface and stable magnetic performance is obtained.
    Type: Application
    Filed: April 14, 2011
    Publication date: November 7, 2013
    Inventors: Zipeng Zhao, Yaming Ji, Yongjie Yang, Guobao Li, Dengfeng Li, Yunpeng Xu
  • Publication number: 20130284711
    Abstract: A fast-speed laser scoring method is provided, in which a set of related laser scoring device is used to simultaneously score lines on the upper surface and the lower surface of an oriented silicon steel strip, which is being fed and traveling forwards on a production line, with high-focalized continuous wave laser beam; the lines scored on the upper surface and the lines scored on the lower surface have the same space between every two adjacent scored lines but are staggered each other in order to reduce iron loss evenly. The space between every two adjacent scored lines on the same surface is 6-12 mm, laser power is 1000-3000 W and scanning speed is 100-400 m/min. The machining rate of the scoring method and device attains 1.5-2 times the one of conventional scoring methods which can not simultaneously score the upper and lower surfaces of a steel strip at a time. The lines scored on a steel strip by the method can reduce iron loss of the strip by 10-16%.
    Type: Application
    Filed: April 28, 2011
    Publication date: October 31, 2013
    Applicant: Baoshan Iron & Steel Co., Ltd.
    Inventors: Wangya Huang, Guobao Li, Xinqiang Zhang, Xing Mao, Wanqing Guo, Jianru Zhu, Banglin Xiang
  • Publication number: 20130233450
    Abstract: A method for manufacturing an oriented silicon steel product with high magnetic-flux density comprises the following procedures: 1) smelting and casting, wherein the oriented silicon steel is composed of, by weight, 0.035˜0.065% of C, 2.9˜4.0% of Si, 0.05˜0.20% of Mn, 0.005˜0.01% of S, 0.015˜0.035% of Al, 0.004˜0.009% of N, 0.005˜0.090% of Sn, 0.200˜0.800% of Nb, the rest being Fe; and after being smelted, molten steel is secondarily refined and continuous casted into steel slabs; 2) hot rolling; 3) normalizing; 4) cold rolling; 5) decarburization annealing; 6) MgO coating; 7) high temperature annealing: said sheets are firstly heated to 700˜900° C. and then secondarily heated to 1200° C. at temperature rise rate of 9˜17° C./hr and maintained at 1200° C. for 20 hr; 8) coating an insulation layer.
    Type: Application
    Filed: April 14, 2011
    Publication date: September 12, 2013
    Inventors: Qi Xu, Kanyi Shen, Guobao Li, Weizhong Jin, Bingzhong Jin, Dejun Su, Renbiao Zhang, Hai Liu
  • Publication number: 20130090876
    Abstract: A method for detecting electromagnetic property of oriented silicon steel, the method comprises: measuring Euler angles of each of crystal grains in a specimen by use of metallographic etch-pit method; calculating orientation deviation angle ?i (degree) of the crystal grain; combining area Si (mm2) of the crystal grain and correction coefficient X of element Si (X=0.1˜10 T/degree); correcting on the basis of the magnetic property B0 (saturation magnetic induction, T) of single-crystal material by using these parameters (?i, Si, X), formula for correcting is B 8 = - 0.015 × X × ? n = 1 i ? S i ? ? ? i ? ? n = 1 i ? S i + ( B 0 - 0.04 ) ( 1 ) ; obtaining electromagnetic property B8 of the oriented silicon steel by the above calculations.
    Type: Application
    Filed: April 12, 2011
    Publication date: April 11, 2013
    Applicant: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Meihong Wu, Weizhong Jin, Huande Sun, Guohua Yang, Kanyi Shen, Jie Huang, Guobao Li
  • Patent number: 8333846
    Abstract: A manufacturing method of oriented Si steel with high electric-magnetic property comprises the following steps: smelting steel in converter or electric furnace; refining molten steel in two stages; continuous casting to obtain slab; hot rolling; first cold rolling; decarburizing annealing; secondary cold rolling; applying an annealing separator based on MgO and annealing at high temperature; applying an insulating coating and leveling tension annealing. The slab comprises (in wt %): C 0.020-0.050%, Si 2.6-3.6%, S 0.015-0.025%, Als 0.008-0.028%, N 0.005-0.020%, Mn 0.15-0.5%, Cu 0.3-1.2%, balance Fe and inevitable impurities, in which 10?Mn/S?20 and Cu/Mn?2. The method could produce oriented Si steel with high magnetic induction intensity and low iron loss at low cost.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: December 18, 2012
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Guohua Yang, Huande Sun, Yaming Ji, Guobao Li, Hongxu Hei