High grade non- oriented silicon steel and method for manufacturing same

A technology of oriented silicon steel and a manufacturing method, applied in the field of metallurgy, can solve the problems of furnace roll nodules, high risk of use of floaters, and high cost, and achieve the effects of reducing energy consumption, reducing furnace roll nodules and reducing costs.

Active Publication Date: 2008-12-31
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, the problems brought about by high-temperature annealing are high cost, and the second is that the oxides attached to the surface of the strip are reduced to iron by hydrogen and accumulate on the surface of the furnace roll, thus causing nodulation of the furnace roll
In order to prevent furnace roll nodules and prolong the service life of furnace rolls, measures are usually taken

Method used

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  • High grade non- oriented silicon steel and method for manufacturing same
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  • High grade non- oriented silicon steel and method for manufacturing same

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[0029] Smelt according to the components in Table 1, and obtain continuous casting slabs by continuous casting, continuous casting slab heating, rough rolling, finish rolling, regular treatment, pickling, 70-78% reduction ratio, one-time cold rolling to 0.5mm Finished thickness, final recrystallization annealing of cold rolled strip at different temperatures. Table 2 is the result of the chemical composition steel grades in Table 1 (corresponding to the furnace number) adopting the production method of the present invention and the finished product Epstein square circle.

[0030] Table 1 embodiment chemical composition (%)

[0031]

[0032] Table 2 embodiment production method and magnetic result

[0033]

[0034] The components of furnaces 1, 2, 5, and 6 in Table 1 in the embodiment were processed according to the process shown in Table 3 for magnetic measurement, and the magnetic detection results are shown in Table 3.

[0035] Table 3 embodiment production method an...

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Abstract

The invention discloses a high-brand non-oriented silicon steel as well as a manufacturing method, which are mainly characterized in that: chemical constituents thereof include, in weight percent: Si: 2.5 to 3.5 percent, Al: 0.5 to 1.5 percent, C<=0.004 percent, Mn: 0.10 to 1.50 percent, P<=0.02 percent, S<=0.005 percent, N<=0.002 percent, B<=0.005 percent, B/(C+N)=0.5-2.0; and the manufacturing method mainly includes: heating a casting billet to above 1100DEG C in a heating furnace, carrying out rolling, normalizing, acid washing and cold rolling after heat preservation, with the reduction rate of between 70 and 78 percent, and annealing, with d.p. equal to -25 to -40DEG C. The non-oriented silicon steel and the manufacturing method can make electric steel sheets and strips with excellent performance, and can reduce furnace roller nodulations and energy consumption in production, and further reduce the production cost.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a high-grade non-oriented electrical steel with excellent magnetic properties and a manufacturing method thereof. Background technique [0002] High-grade non-oriented silicon steel is mainly used to manufacture iron cores of large motors and generators, and its main magnetic feature is extremely low iron loss. Traditionally, its manufacturing feature is that the silicon content is more than 2.5%, and more than 0.2% aluminum is added to increase the resistance in the steel, thereby reducing the iron loss. Then implement hot rolling, normalization and cold rolling processes, and carry out final annealing and coating insulation layer. In order to reduce iron loss, the final annealing temperature is required to be above 1000°C, even 1075°C. However, the problems brought about by high temperature annealing are high cost, and the second is that the oxide attached to the surface of the stri...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C33/04B21B37/74C21D8/12C21D1/26
Inventor 马爱华王波谢世殊金培有陈晓刘献东
Owner BAOSHAN IRON & STEEL CO LTD
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