Semi-process cold-rolling non-oriented electrical steel and production process thereof

A technology for oriented electrical steel and production process, applied in the field of semi-process cold-rolled non-oriented electrical steel and production technology, can solve the problems of large thermal shrinkage of coating, poor dimensional stability, low stacking coefficient of iron core, etc. The effect of electromagnetic performance and process performance, good product processing performance, and stable product performance

Inactive Publication Date: 2013-04-24
HUNAN XUEBAO ELECTRIC APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the organic coating formed after coating these organic paints has good film-forming performance and good punching and shearing processability, there are many insurmountable shortcomings, such as: (1) coating thickness (10-15 μm), welding Poor performance, low core stacking coefficient (92%)
(2) The thermal shrinkage of the coating is large, the iron core is easy to loosen, and the dimensional stability is poor
(3) The hardness of the coating is low (generally around 0.9), the organic solvent is highly toxic, and the price is high, which is easy to cause waste and environmental pollution, and affects the health of operators
(4) The interlayer resistance gradually decreases with the operation. If the iron core is locally overheated, it is prone to carbonization and poor heat resistance
However, excessive wear will be caused to the punching film when punching and cutting the lamination, and it is not easy to produce good adhesion with electrical steel sheets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, the present invention includes the following processes: molten steel smelting, continuous casting, hot rolling, cold rolling, punching, annealing, slitting, punching and annealing, specifically including: molten iron pretreatment→converter smelting, and argon blowing throughout the process →RH scouring→CSP continuous casting→CSP heating furnace→CSP hot continuous rolling→pickling and cold rolling→annealing→tempering and coiling→slitting→punching→annealing; in the converter smelting process, according to the mass percentage C≤0.01, P ≤0.015, S≤0.012, 0.4≤Si≤0.60, 0.6≤Mn≤0.8, 0.15≤AL≤0.25, the rest is the proportion of Fe, and the recovery rate of Si is 95%, the recovery rate of Mn is 97%, and the recovery rate of Al is 35% Add ferrosilicon, ferromanganese and aluminum alloy by metering for alloying to obtain C≤0.01, P≤0.015, S≤0.012, 0.4≤Si≤0.60, 0.6≤Mn≤0.8, 0.15≤AL≤0.25, and the rest is Fe Semi-process cold-rolled non-oriented electrical steel; after CSP c...

Embodiment 2

[0028] Embodiment 2, the production process of the present invention includes: first pouring blast furnace molten iron into the ladle, performing magnesium blowing desulfurization through molten iron pretreatment, oxygen top-bottom composite blowing converter, pouring desulfurized molten steel into oxygen top-bottom composite blowing Smelting the converter, at the same time adding 12% of the total weight of steel scrap into the converter, adding limestone and fluorite into the converter furnace during the blowing process, the converter adopts the whole process of bottom blowing argon process when the molten steel composition [C]≤0.06%, [P ] ≤ 0.04%, [S] ≤ 0.15%, when the end point temperature of molten steel is 1680°C, tap the steel with constant oxygen, add composite deoxidizer when tapping the converter, blow argon throughout the process of tapping the converter, measure the molten steel after blowing argon Temperature, constant oxygen, sampling, according to the oxygen conte...

Embodiment 3

[0030] Example 3: Pour blast furnace molten iron into the molten iron ladle, carry out magnesium blowing desulfurization through molten iron pretreatment, oxygen top-bottom composite blowing converter, pour the desulfurized molten steel into the oxygen top-bottom composite blowing converter, and add For steel scrap accounting for 12% of the total weight, limestone and fluorite are added to the converter during the blowing process, and the converter adopts the whole process of bottom blowing argon when the molten steel composition [C]≤0.06%, [P]≤0.04%, [S] ≤0.15%, when the end point temperature of the molten steel is 1680°C, tap the steel with constant oxygen, add a composite deoxidizer when tapping the converter, blow argon throughout the process of tapping the converter, measure the temperature of the molten steel, set oxygen, and take samples after blowing the argon, according to Oxygen content in molten steel Feed aluminum wire into molten steel, send molten steel into vacuu...

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Abstract

The invention discloses a semi-process cold-rolling non-oriented electrical steel and a production process thereof, which mainly solves the technical problems that the prior art is high in energy consumption, large in pollution and high in cost. According to the technical scheme, the semi-process cold-rolling non-oriented electrical steel is a special steel which comprises the following ingredients by mass: not more than 0.01% of C, not more than 0.015% of P, not more than 0.012% of S, not less than 0.4% and not more than 0.60% of Si, not less than 0.6% and not more than 0.8% of Mn, not less than 0.15% and not more than 0.25% of Al, and the balance of Fe. The production process comprises the following steps: smelting molten steel, continuous casting, hot-rolling, punching and annealing, and specifically comprises the following steps: pretreating molten iron, smelting in a rotary furnace, blowing argon over the whole process, conducting RH (Rockwell Hardness) fine smelting, conducting CSP (Cast Steel Plate) continuous casting, putting in a CSP heating furnace, conducting CSP hot-continuous-casting, pickling and cold-rolling and annealing, wherein in the smelting process in the rotary furnace, silicon iron, ferromanganese iron and an aluminum alloy are added to conduct alloying so as to manufacture an alloy steel. The semi-process cold-rolling non-oriented electrical steel is mainly used in a production process of a motor iron core.

Description

technical field [0001] The invention relates to a non-oriented electrical steel and a production process, in particular to a semi-process cold-rolled non-oriented electrical steel and a production process used in the production of motor iron cores. Background technique [0002] Due to its complex production process, high technical content, difficult production and large investment, cold-rolled electrical steel is currently only produced by a few steel plants such as Wuhan Iron and Steel, Baosteel, Anshan Iron and Steel, and Taiyuan Iron and Steel. These manufacturers all use traditional thickness. The casting slab is produced by the traditional process, but with the large-scale industrial application of the continuous casting and rolling (CSP) process, another brand-new process has been opened up for the production of electrical steel. The preliminary results of the "Key Research Project" all show that the use of CSP to produce medium and low-grade non-oriented electrical st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/04C21D8/12
Inventor 谭亮陈本富
Owner HUNAN XUEBAO ELECTRIC APPLIANCE
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