Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction

A technology of grain-oriented electrical steel sheet and production method, applied in the direction of manufacturing tools, other manufacturing equipment/tools, etc., can solve the problems of increasing the length of the annealing furnace, long normalization time, large equipment investment, etc., and shorten the normalization time, grain size, etc. The effect of easy growth and high magnetic induction

Active Publication Date: 2007-01-03
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second method increases the alloy cost of the steel
In the former method, the hot-rolled plate is treated in the soaking section of the annealing furnace for a long time, while in the latter method, not only the normalization time is long, but also the cooling time is very long. Both of these methods increase the length of the annealing furnace, and the investment in equipment is large. high cost

Method used

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  • Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction
  • Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction
  • Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction

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Experimental program
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Effect test

Embodiment 1

[0036] Converter, RH vacuum treatment and continuous casting to obtain the continuous casting slab with the composition shown in Table 1, which was hot rolled into a 2.5mm thick hot rolled plate. Perform normalization treatment according to the process shown in Table 2, then wash and cold-roll into a 0.50mm thick cold-rolled sheet, and perform annealing treatment, and then coat the surface with an insulating layer. The magnetic detection results are shown in Table 2.

[0037]

[0038] Normalization conditions of hot rolled sheet

Embodiment 2

[0040] After the component 1 in Table 1 in the embodiment is treated according to the normalization process shown in Table 2, annealing at 700 ° C × 30 s is carried out after the first cold rolling, and then 5% reduction rate is smoothed to 0.5 mm, and the magnetic measurement test The samples were annealed at 780°C×1h, and the magnetic properties were measured. The magnetic properties are shown in Table 3.

[0041] Element

[0042] As can be seen from Table 2 and Table 3, the magnetism of the finished plate obtained by the process of the present invention has obvious advantages over the magnetic of the finished plate obtained by the process of the comparative example (low temperature for a long time or the first stage of faster cooling). Illustrate that the hot-rolled sheet produced by the specified composition and hot-rolling process of the present invention passes through the normalization treatment of high-temperature short-time annealing above the Acl point and ...

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Abstract

The production process of cold rolled non-orientation electric steel plate comprising C not more than 0.0050 wt%, Si not more than 2.50 wt%, Al not more than 1.0 wt%, Si+2Al not more than 2.50 wt%, Mn 0.10-1.50 wt%, P not more than 0.20 wt%, S not more than 0.005 wt%, N not more than 0.0025 wt%, Sn+Sb not more than 0.2 wt%, and Fe and inevitable impurities for the rest includes the following steps: 1. smelting, continuous casting and rolling; 2. normalizing treatment of the hot rolled plate through heating at heating rate of 5-15 deg.c / s to over Ac1, heat soaking at 1100 deg.c below for 10-90 s, cooling in two stages including cooling at the cooling rate belw 15 deg.c / s to below 650 deg.c and cooling at the cooling rate capable of ensuring the plate form to below 80 deg.c; 3. cold rolling; and 4. final annealing to form the cold rolled non-orientation electric steel plate.

Description

technical field [0001] The invention relates to a cold-rolled non-oriented electrical steel sheet, in particular to a production method of a cold-rolled non-oriented electrical steel sheet with excellent magnetic properties. Background technique [0002] Cold-rolled non-oriented electrical steel with high magnetic induction and low iron loss is a hot spot in the development of non-oriented electrical steel in recent years. It is developed to meet the requirements of high efficiency and miniaturization for various types of motors and electronic transformer cores in recent years. The loss of the motor mainly includes two parts, one is the iron loss, that is, the core loss, and the other is the copper loss, that is, the loss caused by the wire resistance. For cold-rolled non-oriented electrical steel, iron loss is mainly composed of hysteresis loss and eddy current loss. In general, in order to reduce the eddy current loss, measures such as increasing the content of Si, Al and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/04C22C38/06
Inventor 李保国王波刘献东张丕军张文学陈晓
Owner BAOSHAN IRON & STEEL CO LTD
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