Preparation method of high magnetic induction oriented silicon steel for refining secondary grain size
A technology of high magnetic induction orientation and secondary grains, applied in the field of preparation of oriented silicon steel, can solve the problems of difficult implementation and large equipment changes, and achieve the effects of reducing iron loss, refining magnetic domain width, and simple and easy process.
Active Publication Date: 2013-01-09
ANGANG STEEL CO LTD
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However, since this method requires laser irradiation during the heating process of the steel strip, it is difficult to implement due to large equipment changes.
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[0024] The present invention will be further described below by way of examples.
[0025] The smelting composition of the steel grade of the embodiment of the present invention is shown in Table 1 (the balance is iron and unavoidable impurities). After continuous casting of molten steel into a 250mm thick slab, the slab is heated to 1380°C and finished rolled to 2.0mm at 1200°C. mm and 0.3mm thickness, the cold-rolled plate of each thickness is implemented two kinds of processes respectively: (A) direct decarburization annealing; (B) adopt technical solution of the present invention to carry out laser treatment (see table 2) before decarburization annealing. The cold-rolled sheet is decarburized and annealed at 840℃×4min, and then coated with an isolation layer mainly composed of MgO. For high temperature annealing, the temperature is first raised to 1200°C at 20°C / h in a nitrogen-hydrogen mixture, and then kept at 1200°C for 30 hours in a pure hydrogen atmosphere, then the t...
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The invention provides a preparation method of high magnetic induction oriented silicon steel for refining secondary grain size, comprising the processes of smelting, continuous casting, hot rolling, normalizing, cold rolling, decarburizing annealing, isolation layer coating, high temperature annealing, insulating coating applying, hot drawing, flattening and annealing. The preparation method is characterized in that the laser irradiation treatment of a cold-rolled plate is carried out before decarburizing annealing so that linear strain regions parallel to each other and at uniform intervalsare formed on the surface of the steel plate. The width of the strain region is 100-200 microns; the distance between the strain regions is 10-20 mm; the depth of the strain region is 20-100 microns;and the included angle between the strain region and the rolling direction of the steel plate is 60-120 degrees. The process of the invention is simple and easy to carry out and wide in application without damaging the surface oxide film or improving the existing equipment. With the preparation method, the final finished products can be increased by 0.01-0.05T in B8 and decreased by 0.02-0.10 W / kg in P17.
Description
technical field [0001] The invention belongs to the preparation technology of oriented silicon steel, and in particular relates to a preparation method of high magnetic induction oriented silicon steel with refined secondary grain size. Background technique [0002] Iron loss of electrical steel (P T ) including hysteresis loss (P h ), eddy current loss (P e ) and abnormal loss (P a )three parts. where P a It is the energy loss caused by the difference in magnetic domain structure when the material is magnetized. Due to the large grain size of grain-oriented silicon steel, P h only accounts for about 30%, P e +P a about 70%, while P a Comparable P e 1 to 2 times larger. [0003] The secondary grain size of grain-oriented silicon steel directly affects P a . The relationship between the static magnetic domain width δ and the grain size d is as follows: [0004] δ = 1.32 ( γ ...
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IPC IPC(8): C21D1/09C21D8/12C21D1/26
Inventor 蒋奇武金文旭张静付勇军游清雷张海利庞树芳王晓达
Owner ANGANG STEEL CO LTD