A method for producing semi-process non-oriented electrical steel by endless rolling

A technology of grain-oriented electrical steel and endless rolling, applied in the field of iron and steel, can solve the problems of high cost, long process, low efficiency, etc., and achieve the effect of good magnetic properties

Active Publication Date: 2021-09-07
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses conventional smelting, continuous casting, and hot rolling processes to produce hot-rolled plates, and performs high-temperature normalization and cold-rolling with temperature. The process is long and inefficient. The additional normalization and cold-rolling heating processes are costly.

Method used

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  • A method for producing semi-process non-oriented electrical steel by endless rolling
  • A method for producing semi-process non-oriented electrical steel by endless rolling
  • A method for producing semi-process non-oriented electrical steel by endless rolling

Examples

Experimental program
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Effect test

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 cast slab through a fan-shaped section. After being scaled, it is rolled in a finishing mill and layer cooled to obtain non-oriented electrical steel hot-rolled raw materials with a thickness of 0.5-1.2mm (hot-rolled plate thickness); the cas...

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 the production process, reduces the production cost, and realizes short process and high-efficiency manufacturing.

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Abstract

The invention relates to a method for producing semi-process non-oriented electrical steel by endless rolling. The production step is a smelting process; continuous casting-hot rolling process: wherein the pouring speed is 4.0-7.0 m / min, and the thickness of the slab is 91-91. 110mm, the induction heating temperature is 950-1150°C, the holding time is 30-60s, the final rolling temperature is 850-950°C, and the coiling temperature is ≥750°C; (3) pickling and critical pressure; (4) decarburization Stress annealed and blued. In the endless rolling process of the present invention, the billet is directly rolled into a thin plate without heating in a soaking furnace at a high drawing speed, coiled at high temperature, critical reduction, stress relief and blueing annealing, eliminating the need for one cold rolling and intermediate annealing, No coating, no environmental pollution; it has the advantages of short process, green and low carbon, and high efficiency.

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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Patent Type & Authority Patents(China)
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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