Smelting method of non-oriented electrical steel sheet with excellent magnetic properties
A technology of oriented electrical steel plate and smelting method, which is applied in the manufacture of converters, etc., can solve the problems of difficult removal of inclusions, difficult removal by floating, unfavorable purity of molten steel, etc., to reduce inclusions in steel plates and facilitate grain growth , Improve the effect of steel purity
Active Publication Date: 2016-01-20
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
The disadvantage is: the deoxidation product Al as an inclusion 2 o 3 The size is small, the quantity is large, and it is not easy to float and remove in the subsequent refining and casting process, especially in the case of high Si and Al content, the molten steel becomes more viscous, and the inclusions are more difficult to remove
This patent adopts the wire feeding method under normal pressure, which will not only increase the time and temperature loss of RH refining (vacuum cycle degassing refining), but also cause nitrogen absorption, secondary oxidation, slag entrainment, etc. during the wire feeding process. Cause secondary pollution of molten steel, which is not conducive to the improvement of the purity of molten steel
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[0042] The embodiment is carried out according to the technological process of the present invention: molten iron and steel scrap are matched according to the ratio, and after smelting in a 300-ton converter, the top slag of the ladle is modified; Calcium alloy is added to the steel, degassed and continuously cast to obtain a slab with a thickness of 170 mm to 250 mm and a width of 800 mm to 1400 mm. The cast slab that has passed through the above process is successively hot-rolled, pickled, cold-rolled and annealed to obtain the product. The comparative example is the product without calcium treatment.
[0043] The inclusions of the finished samples corresponding to the comparative example (without calcium treatment) and the embodiment (with calcium treatment) were observed by a HITACHIS4200 scanning electron microscope. Each sample was observed continuously for 10 fields of view. The type, size and quantity distribution of the two inclusions were counted. The content of t...
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Abstract
The invention discloses a smelting method of a non-oriented electrical steel plate with excellent magnetism. The smelting method comprises the following steps: molten iron pretreatment, charging-smelting, converter tapping, modification, deep decarbonization, deoxidizing-alloying, calcium treatment, refining-degassing, pouring for billet formation, hot rolling, acid washing, cold rolling, annealing and coating, wherein the chemical components of top tapping slag are controlled by modification and the work process of calcium treatment is added in the technology. By virtue of the smelting method, under the condition of no normalization or bell-type furnace intermediate annealing, molten steel can be subjected to calcium treatment by adding a calcium treatment agent, and the parameters such as chemical components, addition amount, addition ways and particle size of the treatment agent are controlled; on one hand, the work processes are reduced and secondary oxidization caused by long-time calcium treatment in RH refining (co-developed by Ruhrstahl and Hereaeus) is avoided; on the other hand, molten steel with high purity can be obtained, the magnetic induction of a finished steel plate can be improved, and the quality of the finished steel plate can be enhanced. The smelting method has the characteristics of being convenient to operate, simple to control, low in cost and stable in production.
Description
technical field [0001] The invention relates to a method for smelting a non-oriented electrical steel plate, in particular to a method for smelting a non-oriented electrical steel plate with excellent magnetic properties. Background technique [0002] In recent years, as various EI iron cores, motors, and compressors have gradually developed towards small, precise, and high-efficiency directions to meet the needs of energy saving, high efficiency, and environmental protection, in order to meet the needs of these electrical products as their corresponding raw materials, non-oriented Electrical steel sheets must have excellent magnetic properties while maintaining a price advantage, that is, the performance of ultra-low iron loss and ultra-high magnetic induction. [0003] Since Si and Al elements can significantly increase the resistivity of the material, can effectively reduce the magnetocrystalline anisotropy, make magnetization easier, and thus can greatly reduce the iron ...
Claims
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IPC IPC(8): C21C5/28C21C7/10C21C7/068C21D8/12
Inventor 张峰朱简如王波张兰章培莉
Owner BAOSHAN IRON & STEEL CO LTD