A kind of non-oriented electrical steel sheet with low cost and extremely low aluminum and its manufacturing method

Abstract

The invention discloses a low-cost and extremely low-aluminum non-oriented electrical steel sheet, which contains the following chemical elements in the following mass percentages: C≤0.003%, Si: 0.1%-1.2%, Mn: 0.1%-0.4%, P : 0.01% to 0.2%, S≤0.003%, Als≤0.001%, O: 0.003% to 0.01%, N≤0.003%, Sn: 0.005% to 0.05%, and satisfying Si 2 / P: 0.89 to 26.04. In addition, the present invention also discloses a method for manufacturing the above-mentioned non-oriented electrical steel sheet, which comprises the steps of: (1) smelting; (2) continuous casting; (3) hot rolling: wherein the hot rolled sheet is not subjected to normalization treatment or normalization after coiling. Bell furnace annealing, but using the residual heat of the hot-rolled steel coil for soaking and heat preservation; (4) one-time cold rolling; (5) continuous annealing. The non-oriented electrical steel sheet of the present invention adopts reasonable chemical composition and process design, not only has excellent economy, but also has the characteristics of high magnetic induction and low iron loss.

Description

technical field [0001] The present invention relates to a steel sheet and a manufacturing method thereof, in particular to a non-oriented electrical steel sheet and a manufacturing method thereof. Background technique [0002] For a long time, non-oriented electrical steel sheets have been developing in two directions: one is high-efficiency and high-grade steel with high manufacturing cost and complex production process, but excellent electromagnetic and mechanical properties; Simple, medium and low grade steel with excellent electromagnetic properties and mechanical properties. [0003] According to statistics, due to different application occasions, the number of medium and low grade non-oriented electrical steel sheets accounts for 70% or more of all non-oriented electrical steel sheets. Therefore, it is of great practical significance to study how to produce medium and low grade non-oriented electrical steel sheets more economically and conveniently, and further improv...

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Problems solved by technology

[0004] In addition, studies have shown that in the electromagnetic performance indicators of non-oriented electrical steel sheets, iron loss and magnetic induction are mutually restricted, and it is difficult to achieve low iron loss and high magnetic induction at the same time, unless normalization of hot-rolled steel sheets or Bell furnace annealing treatment, etc., but this will greatly increase the manufacturing cost of the finished steel plate

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