Patents by Inventor Pijun Zhang
Pijun Zhang 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: 11534806Abstract: The present disclosure provides a high-efficient rolling process for magnesium alloy sheet. Parameters of the rolling process are: the rolling speed of each rolling pass is 10-50 m/min, the rolling reduction of each rolling pass is controlled to be 40-90%, and both the preheating temperature before rolling and the rolling temperature of each rolling pass are 250-450° C. The present disclosure also provides a preparation method for magnesium alloy sheet, comprising: 1) preparing rolling billets; 2) high-efficient hot rolling; and 3) performing annealing. The rolling process can improve the mechanical performance especially, the strength and ductility of the sheet.Type: GrantFiled: December 6, 2016Date of Patent: December 27, 2022Assignee: BAOSHAN IRON & STEEL CO., LTD.Inventors: Shiwei Xu, Weineng Tang, Jianfeng Nie, Mingzhe Bian, Haomin Jiang, Pijun Zhang
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Patent number: 11286568Abstract: A film forming treatment agent for a composite chemical conversion film for magnesium alloy, and a film forming process method, and a composite chemical conversion film are provided. Components of the film forming treatment agent for a composite chemical conversion film for magnesium alloy comprise a water solution and a suspension of reduced graphene oxide flakes to the water solution. The water solution comprises strontium ions at 0.1 mol/L to 2.5 mol/L and phosphate ions at 0.06 mol/L to 1.5 mol/L, and pH of the water solution is 1.5 to 4.5. Concentration of the reduced graphene oxide varies between 0.1 mg/L and 5 mg/L. The film forming process method for a composite chemical conversion film for magnesium alloy comprises the following steps of: 1) pretreatment on surface of magnesium alloy matrix; 2) immersion of magnesium alloy matrix in the film forming treatment agent; and 3) removal of magnesium alloy pieces for drying in air.Type: GrantFiled: December 6, 2016Date of Patent: March 29, 2022Assignee: BAOSHAN IRON & STEEL CO., LTD.Inventors: Shiwei Xu, Weineng Tang, Xiaobo Chen, Cong Ke, Nick Birbilis, Haomin Jiang, Pijun Zhang
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Patent number: 10870905Abstract: A die-casting magnesium alloy. The die-casting magnesium alloy comprises, by mass percent, 1% to 5% of La, 0.5% to 3% of Zn, 0.1% to 2% of Ca, 0.1% to 1% of Mn and the balance Mg and other inevitable impurities. The die-casting magnesium alloy manufacturing method comprises smelting, refinement and die-casting. The die-casting magnesium alloy has good mechanical performance, die-casting performance and heat conduction performance.Type: GrantFiled: December 6, 2016Date of Patent: December 22, 2020Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Shiwei Xu, Jichun Dai, Weineng Tang, Changlong Zhuo, Haomin Jiang, Pijun Zhang
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Patent number: 10570490Abstract: A method of strengthening a dilute magnesium alloy sheet includes providing a dilute magnesium alloy sheet, which includes a magnesium alloy consisting essentially of (wt %): >0 to 3.0 of Zn; >0 to 1.5 of Ca; 0 to 1.0 of Zr; 0 to 1.3 of a rare earth element or mixture of the same; 0 to 0.3 of Sr; 0 to 0.7 of Al, the balance of Mg and other unavoidable impurities, wherein the total weight % of alloying elements is less than 3%; subjecting the dilute magnesium alloy sheet to plastic deformation, in which the tensile plastic strain should exceed 0.5%, but be less than 8% to form a pre-deformed magnesium alloy sheets; and subjecting the pre-deformed magnesium alloy sheets to an ageing treatment in a temperature range of 80 to 250° C. for at least 1 minute, thereby forming a strengthened magnesium alloy sheet.Type: GrantFiled: April 8, 2015Date of Patent: February 25, 2020Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Jian-Feng Nie, Zhuoran Zeng, Mingzhe Bian, Christopher Huw John Davies, Nick Birbilis, Shiwei Xu, Pijun Zhang
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Publication number: 20190299263Abstract: A high-efficient rolling process for magnesium alloy sheet. The process is a rolling process for rolling billets. Parameters of the rolling process are: the rolling speed of each rolling pass is 10˜50 m/min, the rolling reduction of each rolling pass is controlled to be 40˜90%, and both the preheating temperature before rolling and the rolling temperature of each rolling pass are 250˜450° C. A preparation method for magnesium alloy sheet. The method comprises the steps of: 1) preparing rolling billets; 2) high-efficient hot rolling: controlling the rolling speed of each rolling pass to be 10˜50 m/min, controlling the rolling reduction of each rolling pass to be 40˜90%, and controlling both the preheating temperature before rolling and the rolling temperature of the each rolling pass to be 250˜450° C.; and 3) performing annealing.Type: ApplicationFiled: December 6, 2016Publication date: October 3, 2019Inventors: Shiwei XU, Weineng TANG, Jianfeng NIE, Mingzhe BIAN, Haomin JIANG, Pijun ZHANG
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Publication number: 20180363145Abstract: A film forming treatment agent for a composite chemical conversion film for magnesium alloy, and a film forming process method, and a composite chemical conversion film are provided. Components of the film forming treatment agent for a composite chemical conversion film for magnesium alloy comprise a water solution and a suspension of reduced graphene oxide flakes to the water solution. The water solution comprises strontium ions at 0.1 mol/L to 2.5 mol/L and phosphate ions at 0.06 mol/L to 1.5 mol/L, and pH of the water solution is 1.5 to 4.5. Concentration of the reduced graphene oxide varies between 0.1 mg/L and 5 mg/L. The film forming process method for a composite chemical conversion film for magnesium alloy comprises the following steps of: 1) pretreatment on surface of magnesium alloy matrix; 2) immersion of magnesium alloy matrix in the film forming treatment agent; and 3) removal of magnesium alloy pieces for drying in air.Type: ApplicationFiled: December 6, 2016Publication date: December 20, 2018Applicant: Baoshan Iron & Steel Co., Ltd.Inventors: Shiwei XU, Weineng TANG, Xiaobo CHEN, Cong KE, Nick BIRBILIS, Haomin JIANG, Pijun ZHANG
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Publication number: 20180347010Abstract: A die-casting magnesium alloy. The die-casting magnesium alloy comprises, by mass percent, 1% to 5% of La, 0.5% to 3% of Zn, 0.1% to 2% of Ca, 0.1% to 1% of Mn and the balance Mg and other inevitable impurities. The die-casting magnesium alloy manufacturing method comprises smelting, refinement and die-casting. The die-casting magnesium alloy has good mechanical performance, die-casting performance and heat conduction performance.Type: ApplicationFiled: December 6, 2016Publication date: December 6, 2018Inventors: Shiwei XU, Jichun DAI, Weineng TANG, Changlong ZHUO, Haomin JIANG, Pijun ZHANG
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Publication number: 20180105910Abstract: A method of strengthening a dilute magnesium alloy sheet includes providing a dilute magnesium alloy sheet, which includes a magnesium alloy consisting essentially of (wt %): >0 to 3.0 of Zn; >0 to 1.5 of Ca; 0 to 1.0 of Zr; 0 to 1.3 of a rare earth element or mixture of the same; 0 to 0.3 of Sr; 0 to 0.7 of Al, the balance of Mg and other unavoidable impurities, wherein the total weight % of alloying elements is less than 3%; subjecting the dilute magnesium alloy sheet to plastic deformation, in which the tensile plastic strain should exceed 0.5%, but be less than 8% to form a pre-deformed magnesium alloy sheets; and subjecting the pre-deformed magnesium alloy sheets to an ageing treatment in a temperature range of 80 to 250° C. for at least 1 minute, thereby forming a strengthened magnesium alloy sheet.Type: ApplicationFiled: April 8, 2015Publication date: April 19, 2018Inventors: Jian-Feng NIE, Zhuoran ZENG, Mingzhe BIAN, Christopher Huw John DAVIES, Nick BIRBILIS, Shiwei XU, Pijun ZHANG
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Publication number: 20180087133Abstract: Formable magnesium based wrought alloys include a magnesium based wrought alloy consisting essentially of (wt %): 0.1 to 2.0 of Zn; 0.05 to 1.5 of Ca; 0.1 to 1.0 of Zr; 0 to 1.3 of a rare earth element or mixture of the same of which includes Gd or Y; 0 to 0.3 of Sr, Al: 0 to 0.7; the balance of Mg and other unavoidable impurities.Type: ApplicationFiled: April 8, 2015Publication date: March 29, 2018Inventors: Jian-Feng NIE, Zhuoran ZENG, Mingzhe BIAN, Christopher Huw John DAVIES, Nick BIRBILIS, Shiwei XU, Pijun ZHANG
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Patent number: 9038429Abstract: 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: GrantFiled: December 31, 2009Date of Patent: May 26, 2015Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Guobao Li, Pijun Zhang, Yongjie Yang, Kanyi Shen, Zhuochao Hu, Peiwen Wu, Weizhong Jin, Quanli Jiang
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Publication number: 20120000262Abstract: 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 [0] 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: ApplicationFiled: December 31, 2009Publication date: January 5, 2012Applicant: BAOSHAN IRON & STEEL CO., LTD.Inventors: Guobao Li, Pijun Zhang, Yongjie Yang, Kanyi Shen, Zhuochao Hu, Peiwen Wu, Weizhong Jin, Quanli Jiang