Method for manufacturing cold-rolled orientation-free electrical sheet

A technology of oriented electrical steel and manufacturing method, which is applied in the field of manufacturing non-oriented electrical steel, can solve the problems of fast slab drawing speed, increased viscosity, complex production process, etc., and achieve easy low-temperature heating, high recrystallization ratio, and grain gross effect

Active Publication Date: 2005-05-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The production process is complicated and the cost is high
[0005] 2. Continuous casting with low superheat (<15°C) can also increase the proportion of equiaxed grains in non-oriented electrical steel with high silicon content in ultra-low carbon, but the temperature management between converter-refining-continuous casting is very difficult, and molten steel is in The temperature of the crystallizer is very low, the viscosity increases, it is very difficult for the inclusions to float up, and the proportion of inclusion defects in the finished plate increases
[0011] iii. Because the slab is thin and the drawing speed is fast, it is impossible to produce other varieties with high surface grade requirements, such as automobile outer panels, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Converter, RH vacuum treatment to get C: 0.003%, Si: 0.25%, Mn: 0.25%, Al: 0.25%, P: 0.08%, S: 0.005%, N: 0.003%, O: 0.015%, the rest is Fe Molten steel is continuously cast into slabs and hot-rolled at a casting speed of 2.5m / min, after which the hot-rolled plates are pickled and cold-rolled into cold-rolled plates with a thickness of 0.50mm, and the finished plates are obtained by final annealing. Compared with the magnetic properties of the final finished plate produced by the traditional 230 billet thickness and thin billet, see Table 1.

[0037]

Embodiment 2

[0039] Converter, RH vacuum treatment to get C: 0.0025%, Si: 2.00%, Mn: 0.25%, Al: 0.23%, P: 0.008%, S: 0.004%, N: 0.002%, O: 0.0015%, the rest is Fe The molten steel is continuously cast into a slab at a casting speed of 2.5m / min, and hot rolled. After that, the hot-rolled plate is pickled and cold-rolled into a 0.50mm thick cold-rolled plate, and finally annealed to obtain a finished plate. Compared with the magnetic properties of the final finished plate produced by the traditional 230 billet thickness (with or without electromagnetic stirring) and thin billet, see Table 2.

[0040]

Embodiment 3

[0042] Converter, RH vacuum treatment to get C: 0.0025%, Si: 3.00%, Mn: 0.25%, Al: 0.50%, P: 0.010%, S: 0.003%, N: 0.0015%, O: 0.0015%, the rest is Fe The molten steel is continuously cast into a slab and hot rolled at a casting speed of 2.5m / min. After that, the hot rolled plate is pickled and cold rolled into a 0.50mm thick cold rolled plate, and finally annealed to obtain a finished plate. Compared with the magnetic properties of the final finished plate produced by the traditional 230mm billet thickness and thin billet, see Table 3.

[0043]

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Abstract

This is about the manufacturing method of cold-rolled non-oriented electrical steel, including the following steps: a) the continuous casting of blanks: the liquid steel is continuously cast into a blank of 120-170mm at a pulling speed of 2-3 m / min; b) hot rolling: the blanks are directly hot-rolled or heated into the hot-rolled plate of 900-1150 deg.C and the thickness of the blank is hot-rolled to 0.8-4mm with finishing temperature 800-900deg.C and coiling temperature 500-900deg.C; c) cold rolling: the hot-rolled band undergoes annealing or non annealing treatment and acidwashing, and then the first cold-rolling or the second cold-rolling with annealing until the goal thickness reaches. When the finishing annealing is carried out, the non-oriented electrical steel is produced.

Description

technical field [0001] The present invention relates to a method for manufacturing non-oriented electrical steel. Background technique [0002] The traditional continuous casting-hot rolling production line is the production method used by most iron and steel plants to produce cold-rolled non-oriented electrical steel products. The output can reach 3 million tons to 4 million tons). [0003] The traditional continuous casting to produce non-oriented silicon steel is carried out under the conditions of continuous casting casting speed of 0.8-1.5m / min and casting slab thickness of 210mm-250mm. According to the design of this process, the following problems exist in the production of non-oriented electrical steel: [0004] 1. Under normal continuous casting superheat conditions (15°C ~ 40°C), due to the low casting speed, the solidification time is very long, columnar for electrical steel with a C content of less than 50ppm and a Si content of 1.5% to 2.5%. The proportion of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D8/12
Inventor 庞远林王波孙焕德陈易之张丕军杨春平刘献东
Owner BAOSHAN IRON & STEEL CO LTD
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