Baoshan Iron & Steel Co., Ltd.

Boashan Iron & Steel Co., Ltd.

Shishu Xie

Xiandong Liu

Bo Wang

Hongxu Hei

Aihua Ma

Liang Zou

Xiao Ling Chen

Feng Zhang

Huawei Zhang

Peili Zhang

Zhenyu Zong

Wei Cao

Jie Huang

Xiaolin Li

Bin Chen

Yanli Song

Yongjie Yang

Guohua Yang

Zhanyuan Hu

Zhicheng Wang

Dejun Su

Xuejun Lv

Chunguo Lv

Lingyun Chen

Lan Zhang

Runjie Lin

Yongqiang Lu

Xianshi Fang

Junliang Liu

Xuejun Lu

Yanwei Wang

Zitao Wang

Yuhua Zhu

Bingzhong Jin

Rongqiang Jiang

Miao Ye

Xiao Chen

A high-magnetic-induction low-iron-loss non-oriented silicon steel sheet and a manufacturing method therefor. The chemical composition by mass percentages is: C≤0.005%, Si: 0.1%-1.6%, Mn: 0.1%-0.5%, P≤0.2%, S≤0.004%, Al≤0.003%, N≤0.005%, Nb≤0.004%, V≤0.004% and Ti≤0.003%, with the balance being Fe and inevitable impurities; and at the same time satisfies: 120≤[Mn]/[S]≤160, and [Nb]/93+[V]/51+[Ti]/48+[Al]/27≤[C]/12+[N]/14. After casting, the cooling rate in a cool-down process of casting slab is controlled, and a temperature controlling method is used to adjust the charging temperature of casting slab.

High-magnetic-induction low-iron-loss non-oriented silicon steel sheet and manufacturing method therefor

A non-oriented electrical steel having excellent magnetic properties, the chemical elements thereof in percentage by mass being: Si: 0.2-1.5%, Mn: 0.01-0.30%, Al: 0.001-0.009%, O: 0.005-0.02%, C&#x2264;0.005%, S&#x2264;0.005%, N&#x2264;0.005%, and Ti&#x2264;0.002%, the remainder being Fe and other unavoidable impurities, and Al/Si&#x2264;0.006 and Mn/Si&#x2264;0.2. The method for producing comprises the following sequence of steps: (1) smelting; (2) hot rolling: the slab heating temperature being 850&#xb0; C. to 1250&#xb0; C., and the final rolling temperature being 800-1050&#xb0; C.; (3) acid pickling; (4) cold rolling; (5) annealing: the annealing plate temperature being controlled between 620&#xb0; C.-900&#xb0; C.; and (6) coating.

Non-oriented electrical steel having excellent magnetic properties

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.

Non-oriented silicon steel and its manufacturing method

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&#xd7;10&#x2264;[O][C]e&#x2264;2.99&#xd7;10, 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.

Non-oriented silicon steel and manufacturing process thereof

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 &#x3a3;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.

Non-oriented electrical steel sheet with fine magnetic performance, and calcium treatment method therefor

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: &#x2264;0.005 wt %, P: &#x2264;0.2 wt %, S: &#x2264;0.005 wt %, N: &#x2264;0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: &#x3bc;+&#x3bc;+&#x3bc;&#x2265;13982&#x2212;586.5P; &#x3bc;+&#x3bc;+&#x3bc;&#x2265;10000, wherein Pis the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; &#x3bc;, &#x3bc;, and &#x3bc;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.

Non-oriented electrical steel plate and manufacturing process therefor

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 &#x3b1; of the nonoxidizing heating furnace section to be within a range of 0.8&#x2266;&#x3b1;&#x3c;1.0.

Method for producing silicon steel normalizing substrate

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&#x2266;0.0040%, Si:0.1&#x2dc;0.8%, Al:0.002&#x2dc;1.0%, Mn:0.10&#x2dc;1.50%, P:&#x2266;0.2%, Sb:0.04&#x2dc;0.08%, S&#x2266;0.0030%, N&#x2266;0.0020%, Ti&#x2266;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&#xb0;&#x2dc;1150&#xb0; and the finish-rolling temperature is 860&#xb0;&#x2dc;920&#xb0;. The hot-rolled product is then air cooled for a period of time within a range determined by air cooling time t: (2+30&#xd7;Sb%)s&#x2266;t&#x2266;7 s. The hot-rolled product is reeled at a temperature &#x2267;720&#xb0; and cold-rolled to form cold-rolled plate with a target thickness at a reduction ratio of 70&#x2dc;78% followed by heating up the cold-rolled plate to 800&#x2dc;1000&#xb0; at heating rate of &#x2267;15&#xb0;/s, and holding time of 10s&#x2dc;25s.

Manufacture method of high-efficiency non-oriented silicon steel with excellent magnetic performance

A method for producing a silicon steel normalizing substrate comprises steelmaking, hot rolling and normalizing steps. A normalizing furnace is used in the normalizing step, and along a moving direction of strip steel, the normalizing furnace sequentially comprises: a preheating section, a nonoxidizing heating section, a furnace throat, furnace sections for subsequent normalizing processing, and a delivery seal chamber. Furnace pressures of the normalizing furnace are distributed as follows: the furnace pressure of a downstream furnace section adjacent to the furnace throat along the moving direction of the strip steel is the highest, the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an inlet direction of the normalizing furnace, and the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an outlet direction of the normalizing furnace.

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: &#x2266;0.005 wt %, P: &#x2266;0.2 wt %, S: &#x2266;0.005 wt %, N: &#x2266;0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: &#x3bc;+&#x3bc;+&#x3bc;&#x2267;13982&#x2212;586.5P; &#x3bc;+&#x3bc;+&#x3bc;&#x2267;10000, wherein Pis the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; &#x3bc;, &#x3bc;, and &#x3bc;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.

A method of producing an extremely thick insulation coating on a surface of an electrical steel, comprises the following steps: 1) preparing a coating liquid&#x2014;stirring sufficiently the coating liquid for 0.1&#x2dc;4 hours, with the viscosity of the coating liquid being within 10&#x2dc;80 S; 2) coating a strip steel&#x2014;using a double-roller or a tri-roller coating machine, wherein the film thickness and evenness can be controlled by adjusting different parameters; 3) baking the coating&#x2014;using three sections, that is, a drying section, a baking section and a cooling section, to bake the coating, wherein the temperature in the drying section is 100&#x2dc;400&#xb0; C., the temperature in the baking section is 200&#x2dc;370&#xb0; C.; the time in the whole drying and solidification section is 33&#x2dc;144 seconds, wherein the time in the drying section is 9&#x2dc;39 seconds, and the baking time is 24&#x2dc;105 seconds; wherein in the baking process, the strip steel having been coated is conveyed in a non-contact way, in particular, the strip steel is conveyed by blowing pressure-adjustable air onto the lower surface to make it float; the air pressure is 0&#x2dc;2000 Pa; the wet film is kept out of contact with the furnace rollers before it is solidified, guaranteeing that the surface of wet film is intact; 4) online detecting the film thickness.

Method of producing extremely thick insulation coating on surface of electrical steel

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Shanghai, China

Shishu Xie