Non-oriented electrical steel for thin slab continuous casting-continuous rolling production and method thereof

Abstract

The invention relates to non-oriented electrical steel and a production method thereof. The non-oriented electrical steel comprises the following chemical compositions in percentage by weight: less than or equal to 0.008 percent of C, 0.15 to 2.2 percent of Si, less than or equal to 0.008 percent of Al, 0.15 to 1.5 percent of Mn, 0.004 to 0.15 percent of P, less than or equal to 0.008 percent of S, less than or equal to 40PPm of [O], less than or equal to 0.005 percent of N, less than or equal to 0.008 percent of Ti, and the balance of iron and inevitable impurities. The production method comprises the following steps of: smelting by using a converter and performing vacuum treatment; continuously casting into slabs with the thickness of 50-90 millimeters; soaking in a tunnel kiln; continuously rolling by using seven mills; coiling; performing pickling; performing cold rolling; performing recrystallization annealing; and obtaining the steel for later use. The alloy is reasonable in design and is not needed to be subjected to calcium treatment; the procedures are simple; the cost is reduced; the defect of low casting property in thin slab continuous casting-continuous rolling production can be effectively overcome; the advantages on cost and magnetic property of the non-oriented electrical steel in the thin slab continuous casting-continuous rolling production are fully shown, and the market competitiveness of the product is greatly improved.

Description

technical field [0001] The invention relates to a non-oriented electrical steel and a production method thereof, in particular to a cold-rolled non-oriented electrical steel with stable castability and excellent magnetic properties and a production method using thin slab continuous casting and rolling. Background technique [0002] The production of non-oriented electrical steel by thin slab continuous casting and rolling has the characteristics of greatly saving energy, improving the yield, shortening the process flow, etc., which greatly reduces the production cost; the production of non-oriented electrical steel by thin slab continuous casting and rolling can realize low-temperature heating and high-temperature final Rolling and high-temperature coiling have the conditions to prepare non-oriented electrical steel with excellent magnetic properties; the soaking process of thin slab continuous casting and rolling can ensure uniform temperature of slab and rolling process, an...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the nozzles are easily blocked or even broken, and the magnetic properties are poor and unstable in the continuous casting process of non-oriented electrical steel produced by thin slab con

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