Baoshan Iron & Steel Co., Ltd.

Boashan Iron & Steel Co., Ltd.

Aihua Ma

Bo Wang

Shishu Xie

Xiandong Liu

Hongxu Hei

Liang Zou

Feng Zhang

Xiao Ling Chen

Huawei Zhang

Yongjie Yang

Wei Cao

Jie Huang

Hai Liu

Xiaolin Li

Yanli Song

Meihong Wu

Zipeng Zhao

Yaming Ji

Zhanyuan Hu

Guohua Yang

Shuangjie Chu

Peili Zhang

Changguo Huang

Jianguo Guo

Changsong Ma

Xuejun Lv

Weiyong Xie

Lan Zhang

Junliang Liu

Xuejun Lu

Yanwei Wang

Zitao Wang

Yuhua Zhu

Bingzhong Jin

Xiao Chen

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. The manufacturing method for a heat-resistant magnetic domain refined grain-oriented silicon steel comprises the step of: forming grooves on a single-sided surface or a double-sided surface of a heat-resistant magnetic domain refined grain-oriented silicon steel in a laser grooving manner, a laser beam of the laser grooving is divided into several sub-beams by a beam splitter, and the several sub-beams form the several sub-grooves which are spliced into the same groove.

Grain-oriented silicon steel having heat-resistant magnetic domain and manufacturing method thereof

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&#x3c;C&#x2264;0.004%, 0.1%&#x2264;Si&#x2264;1.6%, 0.1%&#x2264;Mn&#x2264;0.8%, 0.1%&#x2264;Al&#x2264;0.6%, Ti&#x2264;0.0015%, and the balance being Fe and other inevitable impurities, with 0.2%&#x2264;(Si+Al)&#x2264;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.

High magnetic induction and low iron loss non-oriented electrical steel sheet with good surface state and manufacturing method therefor

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

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.

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Shanghai, China

Aihua Ma