Patents by Inventor Aihua Ma
Aihua Ma 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: 11633809Abstract: A heat-resistant magnetic domain refined grain-oriented silicon steel, a single-sided surface or a double-sided surface of which has several parallel grooves which are formed in a grooving manner, each groove extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel, and the several parallel grooves are uniformly distributed along the rolling direction of the heat-resistant magnetic domain refined grain-oriented silicon steel. Each groove which extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel is formed by splicing several sub-grooves which extend in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel.Type: GrantFiled: June 20, 2018Date of Patent: April 25, 2023Assignee: BAOSHAN IRON & STEEL CO., LTD.Inventors: Shuangjie Chu, Zipeng Zhao, Yongjie Yang, Changsong Ma, Meihong Wu, Yaming Ji, Aihua Ma, Weiyong Xie, Hai Liu, Jianguo Guo
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Publication number: 20210023659Abstract: A heat-resistant magnetic domain refined grain-oriented silicon steel, a single-sided surface or a double-sided surface of which has several parallel grooves which are formed in a grooving manner, each groove extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel, and the several parallel grooves are uniformly distributed along the rolling direction of the heat-resistant magnetic domain refined grain-oriented silicon steel. Each groove which extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel is formed by splicing several sub-grooves which extend in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel.Type: ApplicationFiled: June 20, 2018Publication date: January 28, 2021Inventors: Shuangjie CHU, Zipeng ZHAO, Yongjie YANG, Changsong MA, Meihong WU, Yaming JI, Aihua MA, Weiyong XIE, Hai LIU, Jianguo GUO
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Patent number: 10844451Abstract: Disclosed is a non-oriented electrical steel plate having a good surface state, a high magnetic induction and a low iron loss, the contents of various chemical elements of the non-oriented electrical steel plate in mass percentage being: 0<C?0.004%, 0.1%?Si?1.6%, 0.1%?Mn?0.8%, 0.1%?Al?0.6%, Ti?0.0015%, and the balance being Fe and other inevitable impurities, with 0.2%?(Si+Al)?2.0% being met. Also disclosed is a method for manufacturing the above-mentioned steel plate, comprising the steps: a liquid iron pretreatment, smelting with a converter, RH refining, casting into slabs, hot rolling, acid pickling, cold rolling, annealing and coating. The non-oriented electrical steel plate of the present invention has an excellent magnetic property, an ultralow iron loss and a higher steel purity; in addition the surface quality of the steel plate is good and the production cost is low.Type: GrantFiled: December 8, 2015Date of Patent: November 24, 2020Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Feng Zhang, Bo Wang, Yanli Song, Xuejun Lv, Aihua Ma, Changguo Huang
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Publication number: 20200324371Abstract: A process method for improving the welding seam quality of laser lap welding, including: S100: performing laser welding simulation on a workpiece and determining heat source model parameters of the laser welding simulation; S200: performing, according to the heat source model parameters, welding simulation on the workpiece at different incident angles, so as to acquire first welding seam parameters corresponding to the different incident angles; and S300: when the first welding seam parameters fall within a preset range, determining the incident angles corresponding to the first welding seam parameters as actual laser incident angles. The method can improve the problem of unstable welding seam quality of laser lap welding.Type: ApplicationFiled: October 26, 2017Publication date: October 15, 2020Inventors: Xiaohui HAN, Ruirong ZHAO, Yonggang LIU, Aihua MA
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Patent number: 10385414Abstract: An unoriented silicon steel having high magnetic conductivity and low iron loss at a working magnetic density of 1.0-1.5 T and method for manufacturing same. By proper deoxidation control in a RH refining and high-temperature treatment for a short time in a normalizing step, the method can reduce the amount of inclusions in the silicon steel and improve grain shape, so as to improve the magnetic conductivity and iron loss of the unoriented silicon steel at a magnetic density of 1.0-1.5 T.Type: GrantFiled: March 29, 2012Date of Patent: August 20, 2019Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Liang Zou, Bo Wang, Xiandong Liu, Aihua Ma, Shishu Xie, Hongxu Hei
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Patent number: 10176910Abstract: The present invention provides a non-oriented silicon steel with excellent magnetic properties and a manufacturing process therefor. During the manufacturing process of the present invention, the temperature T of the molten steel of steel tapped from a converter during steelmaking and the carbon content [C] and the free oxygen content [O] comply with the following formula: 7.27×103?[O][C]e(?5000/T)?2.99×104, and the final annealing step uses tension annealing at a low temperature for a short time. A non-oriented silicon steel with a low iron loss, and excellent anisotropy of iron loss can be obtained by means of the manufacturing process of the present invention.Type: GrantFiled: December 11, 2012Date of Patent: January 8, 2019Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Shishu Xie, Xiandong Liu, Xiao Chen, Hongxu Hei, Bo Wang, Aihua Ma, Liang Zou, Huawei Zhang, Wei Cao, Feng Zhang, Junliang Liu
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Patent number: 10147528Abstract: A non-oriented electrical steel sheet with fine magnetic performance, and a calcium treatment method therefor, including an RH (Ruhrstahl-Heraeus) refinement step. The RH refinement step sequentially comprises a decarbonization step, an aluminum deoxidation step, and a step of adding calcium alloy. In the step of adding calcium alloy, time when the calcium alloy is added satisfies the following condition: time interval between Al and Ca/total time after ?Al=0.2-0.8. In this method, production cost is reduced, the production process is simple, a normal processing cycle of RH refinement is not affected, the device is convenient in operation and is controllable, and foreign substances are controllable in both shape and quantities. The non-oriented electrical steel sheet prepared according to the present invention has fine magnetic performance, and the method can be used for mass production of the non-oriented electrical steel sheet with fine magnetic performance.Type: GrantFiled: March 27, 2012Date of Patent: December 4, 2018Assignee: Boashan Iron & Steel Co., LTDInventors: Feng Zhang, Xiandong Liu, Shishu Xie, Xuejun Lu, Xiao Chen, Aihua Ma, Peili Zhang, Yanwei Wang, Lan Zhang, Hongxu Hei
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Patent number: 10096415Abstract: Disclosed are a non-oriented electrical steel plate with low iron loss and high magnetic conductivity and a manufacturing process therefor. The casting blank of the steel plate comprises the following components: Si: 0.1-2.0 wt %, Al: 0.1-1.0 wt %, Mn: 0.10-1.0 wt %, C: ?0.005 wt %, P: ?0.2 wt %, S: ?0.005 wt %, N: ?0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: ?10+?13+?15?13982?586.5P15/50; ?10+?13+?15?10000, wherein P15/50 is the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; ?10, ?13, and ?15 is are relative magnetic conductivities at induction intensities of 1.0 T, 1.3 T, and 1.5 T at 50 Hz, respectively. The steel plate can be used for manufacturing highly effective and ultra-highly effective electric motors.Type: GrantFiled: April 17, 2017Date of Patent: October 9, 2018Assignee: BAOSHAN IRON & STEEL CO., LTDInventors: Aihua Ma, Bo Wang, Xiandong Liu, Liang Zou, Shishu Xie, Hongxu Hei
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Publication number: 20180094331Abstract: Disclosed is a non-oriented electrical steel plate having a good surface state, a high magnetic induction and a low iron loss, the contents of various chemical elements of the non-oriented electrical steel plate in mass percentage being: 0<C?0.004%, 0.1%?Si?1.6%, 0.1%?Mn?0.8%, 0.1%?Al?0.6%, Ti?0.0015%, and the balance being Fe and other inevitable impurities, with 0.2%?(Si+Al)?2.0% being met. Also disclosed is a method for manufacturing the above-mentioned steel plate, comprising the steps: a liquid iron pretreatment, smelting with a converter, RH refining, casting into slabs, hot rolling, acid pickling, cold rolling, annealing and coating. The non-oriented electrical steel plate of the present invention has an excellent magnetic property, an ultralow iron loss and a higher steel purity; in addition the surface quality of the steel plate is good and the production cost is low.Type: ApplicationFiled: December 8, 2015Publication date: April 5, 2018Applicant: BAOSHAN IRON & STEEL CO., LTD.Inventors: Feng Zhang, Bo Wang, Yanli Song, Xuejun LV, Aihua Ma, Changguo Huang
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Publication number: 20180096767Abstract: Disclosed are a non-oriented electrical steel plate with low iron loss and high magnetic conductivity and a manufacturing process therefor. The casting blank of the steel plate comprises the following components: Si: 0.1-2.0 wt %, Al: 0.1-1.0 wt %, Mn: 0.10-1.0 wt %, C: ?0.005 wt %, P: ?0.2 wt %, S: ?0.005 wt %, N: ?0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: ?10+?13+?15?13982?586.5P15/50; ?10+?13+?15?10000, wherein P15/50 is the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; ?10, ?13, and ?15 is are relative magnetic conductivities at induction intensities of 1.0 T, 1.3 T, and 1.5 T at 50 Hz, respectively. The steel plate can be used for manufacturing highly effective and ultra-highly effective electric motors.Type: ApplicationFiled: April 17, 2017Publication date: April 5, 2018Inventors: Aihua Ma, Bo Wang, Xiandong Liu, Liang Zou, Shishu Xie, Hongxu Hei
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Patent number: 9822423Abstract: A method for producing a silicon steel normalizing substrate comprises: steelmaking, hot rolling and normalizing steps. The normalizing step uses a normalizing furnace having a nonoxidizing heating furnace section. The nonoxidizing heating furnace section comprises more than 3 furnace zones. An energy investment ratio of the furnace zones used in the nonoxidizing heating furnace section is adjusted, so as to control an excess coefficient ? of the nonoxidizing heating furnace section to be within a range of 0.8??<1.0.Type: GrantFiled: March 26, 2012Date of Patent: November 21, 2017Assignee: Baoshan Iron & Steel, Co., Ltd.Inventors: Hongxu Hei, Bo Wang, Shishu Xie, Xiandong Liu, Guohua Yang, Yongjie Yang, Aihua Ma, Xiaolin Li, Liang Zou, Huawei Zhang
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Manufacture method of high-efficiency non-oriented silicon steel with excellent magnetic performance
Patent number: 9816152Abstract: A manufacture method of high-efficiency non-oriented silicon steel with excellent magnetic property includes the steps of smelting a chemical composition of non-oriented silicon steel, by weight percent, is: C?0.0040%, Si:0.1˜0.8%, Al:0.002˜1.0%, Mn:0.10˜1.50%, P:?0.2%, Sb:0.04˜0.08%, S?0.0030%, N?0.0020%, Ti?0.0020%, and the rest is Fe and unavoidable inclusions. The molten steel is then cast into billets which are hot-rolled into a hot-rolled product. The heating temperature for the billet is 1100°˜1150° and the finish-rolling temperature is 860°˜920°. The hot-rolled product is then air cooled for a period of time within a range determined by air cooling time t: (2+30xSb %)s?t?7 s. The hot-rolled product is reeled at a temperature ?720° and cold-rolled to form cold-rolled plate with a target thickness at a reduction ratio of 70˜78% followed by heating up the cold-rolled plate to 800˜1000° at heating rate of ?15°/s, and holding time of 10 s˜25 s.Type: GrantFiled: April 27, 2011Date of Patent: November 14, 2017Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Aihua Ma, Bo Wang, Shishu Xie, Zhanyuan Hu, Liang Zou, Zitao Wang, Yuhua Zhu, Jie Huang, Bingzhong Jin, Xiandong Liu -
Patent number: 9659694Abstract: Disclosed are a non-oriented electrical steel plate with low iron loss and high magnetic conductivity and a manufacturing process therefor. The casting blank of the steel plate comprises the following components: Si: 0.1-2.0 wt %, Al: 0.1-1.0 wt %, Mn: 0.10-1.0 wt %, C: ?0.005 wt %, P: ?0.2 wt %, S: ?0.005 wt %, N: ?0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: ?10+?13+?15?13982?586.5P15/50; ?10+?13+?15?10000, wherein P15/50 is the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; ?10, ?13, and ?15 are relative magnetic conductivities at induction intensities of 1.0 T, 1.3 T, and 1.5 T at 50 Hz, respectively. The steel plate can be used for manufacturing highly effective and ultra-highly effective electric motors.Type: GrantFiled: March 27, 2012Date of Patent: May 23, 2017Assignee: BAOSHAN IRON & STEEL CO., LTD.Inventors: Aihua Ma, Bo Wang, Xiandong Liu, Liang Zou, Shishu Xie, Hongxu Hei
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Publication number: 20150034212Abstract: A non-oriented electrical steel sheet with fine magnetic performance, and a calcium treatment method therefor, including an RH (Ruhrstahl-Heraeus) refinement step. The RH refinement step sequentially comprises a decarbonization step, an aluminum deoxidation step, and a step of adding calcium alloy. In the step of adding calcium alloy, time when the calcium alloy is added satisfies the following condition: time interval between Al and Ca/total time after ?Al=0.2-0.8. In this method, production cost is reduced, the production process is simple, a normal processing cycle of RH refinement is not affected, the device is convenient in operation and is controllable, and foreign substances are controllable in both shape and quantities. The non-oriented electrical steel sheet prepared according to the present invention has fine magnetic performance, and the method can be used for mass production of the non-oriented electrical steel sheet with fine magnetic performance.Type: ApplicationFiled: March 27, 2012Publication date: February 5, 2015Applicant: Baoshan Iron & Steel Co., Ltd.Inventors: Feng Zhang, Xiandong Liu, Shishu Xie, Xuejun Lu, Xiao Chen, Aihua Ma, Peili Zhang, Yanwei Wang, Lan Zhang, Hongxu Hei
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Publication number: 20150013847Abstract: A method for producing a silicon steel normalizing substrate comprises: steelmaking, hot rolling and normalizing steps. The normalizing step uses a normalizing furnace having a nonoxidizing heating furnace section. The nonoxidizing heating furnace section comprises more than 3 furnace zones. An energy investment ratio of the furnace zones used in the nonoxidizing heating furnace section is adjusted, so as to control an excess coefficient ? of the nonoxidizing heating furnace section to be within a range of 0.8??<1.0.Type: ApplicationFiled: March 26, 2012Publication date: January 15, 2015Applicant: BAOSHAN IRON & STEEL CO., LTD.Inventors: Hongxu Hei, Bo Wang, Shishu Xie, Xiandong Liu, Guohua Yang, Yongjie Yang, Aihua Ma, Xiaolin Li, Liang Zou, Huawei Zhang
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Publication number: 20150013844Abstract: The present invention provides a non-oriented silicon steel with excellent magnetic properties and a manufacturing process therefor. During the manufacturing process of the present invention, the temperature T of the molten steel of steel tapped from a converter during steelmaking and the carbon content [C] and the free oxygen content [O] comply with the following formula: 7.27×103?[O][C]e(?5000/T)?2.99×104, and the final annealing step uses tension annealing at a low temperature for a short time. A non-oriented silicon steel with a low iron loss, and excellent anisotropy of iron loss can be obtained by means of the manufacturing process of the present invention.Type: ApplicationFiled: December 11, 2012Publication date: January 15, 2015Inventors: Shishu Xie, Xiandong Liu, Xiao Chen, Hongxu Hei, Bo Wang, Aihua Ma, Liang Zou, Huawei Zhang, Wei Cao, Feng Zhang, Junliang Liu
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Publication number: 20150000794Abstract: An unoriented silicon steel having high magnetic conductivity and low iron loss at a working magnetic density of 1.0-1.5 T and method for manufacturing same. By proper deoxidation control in a RH refining and high-temperature treatment for a short time in a normalizing step, the method can reduce the amount of inclusions in the silicon steel and improve grain shape, so as to improve the magnetic conductivity and iron loss of the unoriented silicon steel at a magnetic density of 1.0-1.5 T.Type: ApplicationFiled: March 29, 2012Publication date: January 1, 2015Applicant: BAOSHAN IRON & STEEL CO., LTD.Inventors: Liang Zou, Bo Wang, Xiandong Liu, Aihua Ma, Shishu Xie, Hongxu Hei
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Publication number: 20140377124Abstract: Disclosed are a non-oriented electrical steel plate with low iron loss and high magnetic conductivity and a manufacturing process therefor. The casting blank of the steel plate comprises the following components: Si: 0.1-2.0 wt %, Al: 0.1-1.0 wt %, Mn: 0.10-1.0 wt %, C: ?0.005 wt %, P: ?0.2 wt %, S: ?0.005 wt %, N: ?0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: ?10+?13+?15?13982?586.5P15/50; ?10+?13+?15?10000, wherein P15/50 is the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; ?10, ?13, and ?15 are relative magnetic conductivities at induction intensities of 1.0 T, 1.3 T, and 1.5 T at 50 Hz, respectively. The steel plate can be used for manufacturing highly effective and ultra-highly effective electric motors.Type: ApplicationFiled: March 27, 2012Publication date: December 25, 2014Applicant: BAOSHAN IRON & STEEL CO., LTD.Inventors: Aihua Ma, Bo Wang, Xiandong Liu, Liang Zou, Shishu Xie, Hongxu Hei
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MANUFACTURE METHOD OF HIGH-EFFICIENCY NON-ORIENTED SILICON STEEL WITH EXCELLENT MAGNETIC PERFORMANCE
Publication number: 20130199675Abstract: A manufacture method of high-efficiency non-oriented silicon steel with excellent magnetic property, which comprises the following steps: 1) smelting and casting; chemical compositions of non-oriented silicon steel, by weight percent, are: C?0.0040%, Si: 0.1˜0.8%, Al: 0.002˜1.0%, Mn: 0.10˜1.50%, P: ?0.2%, Sb: 0.04˜0.08%, S?0.0030%, N?0.0020%, Ti?0.0020%, and the rest is Fe and unavoidable inclusions; molten steel in accordance with the above compositions is smelted and then casted into billets; 2) hot-rolling and pickling; heating temperature for slab is 1100° C.˜1150° C. and finish-rolling temperature is 860° C.˜920° C.; after rolling, the hot-rolled product is air cooled, during which air cooling time t: (2+30×Sb %)s?t?7 s; thereafter reeling at a temperature ?720° C. ; 3) cold-rolling; rolling to form cold-rolled plate with target thickness at a reduction ratio of 70˜18%; 4) annealing; heating up the cold-rolled plate to 800˜1000° C. at heating rate of ?15° C./s, and holding time is 10 s˜25 s.Type: ApplicationFiled: April 27, 2011Publication date: August 8, 2013Inventors: Aihua Ma, Bo Wang, Shishu Xie, Zhanyuan Hu, Liang Zou, Zitao Wang, Yuhua Zhu, Jie Huang, Bingzhong Jin, Xiandong Liu -
Publication number: 20120298267Abstract: A non-oriented electrical steel has relative high magnetic induction and high intensity without increasing manufacturing difficulty. The weight percentage of the compositions of the electrical steel are as follows: C?0.0040%, Si is 2.50% to 4.00%, Al is 0.20% to 0.80%, Cr is 1.0 to 8.0%, Ni is 0.5 to 5.0%, Mn?0.50%, P?0.30%, S?0.0020%, N?0.0030%, Ti?0.0030%, Nb?0.010%, V?0.010%, C+S+N+Ti?0.010%, and a balance substantially being Fe and inevitable impurities.Type: ApplicationFiled: June 25, 2012Publication date: November 29, 2012Inventors: Zhanyuan Hu, Bo Wang, Shishu Xie, Aihua Ma, Liang Zou, Zitao Wang, Yuhua Zhu