Non-oriented electrical sheet steel with good iron loss and manufacturing method thereof

Abstract

The invention provides a non-oriented electrical sheet steel with good iron loss, which is characterized in that the non-oriented electrical sheet steel with good iron loss comprises the following components in percentage by weight: C: <= 0.003%, Si: <=1.0%, Mn: <=0.20%, Al: <= 0.001-0.009%, S: <=0.004%, N: <=0.003%, Ti: <= 0.0020%, Al/Si: 0-0.006 and Mn/Si: 0-0.2, wherein the proportion of three element inclusion SiO2-Al2O3-MnO is as follows: SiO2: >=95%, Al2O3: 2-3% and MnO: <=2%, and the balance Fe and inevitable impurities. The invention also provides a manufacturing method for the steel. An optimal component range of Si, Mn and Al is set through research, the level of the oxidized inclusion and precipitates are controlled, growth of grains is promoted and the non-oriented electrical sheet steel with low iron loss is obtained.

Description

Non-oriented electrical steel sheet with excellent iron loss and manufacturing method thereof technical field The invention relates to a metallurgical steel plate and a manufacturing method thereof, in particular to a non-oriented electrical steel sheet with excellent iron loss and a manufacturing method thereof. Background technique With the continuous improvement of energy saving requirements in countries all over the world, higher requirements are put forward for the efficiency and energy saving of motors and transformers. Non-oriented electrical steel sheets used as iron core materials for motors and transformers also require lower iron loss and lower cost. . In order to solve this problem, the current typical methods are as follows: 1. As a low-iron loss technology for low-cost non-oriented electrical steel sheets with a Si content of 1% or less, Japanese patent documents JP-A-52-2824 and JP-3-215627 disclose the addition of rare earth elements (REM) The purpose of...

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However, in the case where further cost reduction is required, it is difficult to sufficiently and

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