Semi-processed non-oriented electrical steel production method through endless rolling

A technology of oriented electrical steel and endless rolling, which is applied in the field of iron and steel, can solve the problems of high cost, long process, increase of normalization and cold rolling heating process, etc., and achieve the effect of short process and good magnetic properties

Active Publication Date: 2019-01-11
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent uses conventional smelting, continuous casting, and hot rolling processes to produce hot-rolled plates, and performs high-temperature norm...

Method used

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  • Semi-processed non-oriented electrical steel production method through endless rolling
  • Semi-processed non-oriented electrical steel production method through endless rolling
  • Semi-processed non-oriented electrical steel production method through endless rolling

Examples

Experimental program
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Embodiment 1

[0032] Embodiment A method for producing semi-process non-oriented electrical steel by endless rolling

[0033]The mass percentage of non-oriented electrical steel components is: C≤0.010%, Si≤1.6%, Als≤0.80%, Mn≤0.50%, S≤0.0080%, N≤0.0080%, and the rest is iron and unavoidable impurities;

[0034] The production steps are as follows:

[0035] (1) Smelting process: After pretreatment and desulfurization, the molten iron enters the converter for steelmaking, then vacuum decarburization and alloying to obtain molten steel that meets the above composition and purity, and then casts;

[0036] (2) Continuous casting-hot rolling process: the molten steel enters the mold of the continuous casting machine through the tundish, and is poured into a slab through a fan section, and the slab is roughly rolled to obtain a 5.0-12mm thick intermediate slab. After being scaled, it is rolled in a finishing mill and layer cooled to obtain non-oriented electrical steel hot-rolled raw materials wi...

experiment example

[0047] The thickness and magnetic property detection of the semi-process non-oriented electrical steel produced in Example 1-Example 9 and Comparative Example 1-Comparative Example 3 are shown in Table 3:

[0048] Table 3 Product thickness, critical reduction ratio and magnetic properties of each process

[0049]

[0050] The results show that the semi-process non-oriented electrical steel produced by the endless rolling of the present invention has excellent magnetic properties, reduces production procedures, reduces production costs, and realizes short-flow and high-efficiency manufacturing.

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Abstract

The invention relates to a semi-processed non-oriented electrical steel production method through endless rolling. The method comprises the production steps that (1) smelting is conducted; (2) continuous casting and hot rolling are conducted, wherein the pouring drawing rate is 4.0-7.0 m/min, the thickness of a casting blank is 91-110 mm, the induction heating temperature is 950-1150 DEG C, heat preservation lasts for 30-60 s, the finish rolling temperature is 850-950 DEG C, and the winding temperature is higher than or equal to 750 DEG C; (3) pickling and critical reduction are conducted; and(4) decarburization stress relief annealing and bluing treatment are conducted. According to the method, in the endless rolling process, at the high drawing speed, the casting blank is directly rolled into a sheet without being heated by a soaking pit furnace, through high-temperature winding, critical reduction, stress relief annealing and bluing treatment, primary cold cooling and intermediateannealing are omitted, no coasting layer is needed, and environmental pollution is avoided; and the method has the advantages of being short in procedure, environmentally friendly, low in carbon and efficient.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and relates to a method for producing semi-process non-oriented electrical steel by endless rolling. Background technique [0002] Non-oriented electrical steel is the key material for making various types of motor cores. In order to improve the performance of electrical steel and reduce production costs, people continue to optimize and improve the production method of electrical steel. [0003] Patent CN101306434A discloses a low-carbon, low-silicon, aluminum-free semi-process method for producing non-oriented electrical steel. The patent requires hot-rolled raw material components to meet C≤0.005%, Si0.1-1.0%, Mn≤0.35%, P≤0.08 %, S ≤ 0.01%, N ≤ 0.008%, O ≤ 0.015%, does not contain Al (testing requirements Al ≤ 0.005%), and the rest is Fe and unavoidable impurities. First cold rolling, intermediate annealing, second critical deformation cold rolling, and stress relief annealing to obtai...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/04C21D8/12
CPCC21D8/1222C21D8/1255C22C38/004C22C38/02C22C38/04C22C38/06
Inventor 郑泽林欧阳页先金柱元陈潮许光喻宗杰朱志强陈良朱经涛俞尧陈统王庆陈传敬赵锐孟令旭孙庆强
Owner RIZHAO STEEL HLDG GROUP
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