Non-oriented electrical steel plate with high magnetic induction and low iron loss, and manufacturing method thereof

Abstract

The invention discloses a non-oriented electrical steel plate with high magnetic induction and low iron loss, and a manufacturing method thereof, wherein the weight percentage of the chemical components of the steel plate is as follows: less than or equal to 0.004 % of C, 0.1-1.6% of Si, 0.02-1.0% of Mn, less than or equal to 0.003% of S, 0.1-0.6% of Al, less than or equal to 0.003% of N and less than or equal to 0.0015% of Ti, wherein Si+Al is between 0.2-2.0%, and Mn, Si and Al satisfies the following formula: Mn=K2*Si+K3*Al+a, k2=0.08-0.11, k3=0.17-0.38; a is a constant and the balance is Fe and unavoidable impurities. The non-oriented electrical steel plate with high magnetic induction and low iron loss has 1.70-1.78T of magnetic induction B50 and 3.59-5.5W / kg of iron loss P15 / 50, has good surface state and is relatively low in manufacture cost without intermediate normalizing or batch annealing, has high magnetic induction, low iron loss and no corrugated defect, and has a magnetic induction B50 0.02T higher and an iron loss P15 / 50 0.2W / kg lower than those of a normal non-oriented electrical steel plate with same license number.

Description

technical field [0001] The present invention relates to a non-oriented electrical steel sheet and a manufacturing method thereof, in particular to a non-oriented electrical steel sheet with good surface condition, low cost, high magnetic induction and low iron loss without normalization or intermediate annealing in a bell-type furnace, and a manufacturing method thereof. The magnetic induction B50 of the non-oriented electrical steel sheet is 0.02T higher than that of the conventional non-oriented electrical steel sheet of the same brand, and the iron loss P15 / 50 is 0.2W / kg lower. Background technique [0002] In recent years, high-efficiency EI iron cores, motors, small transformers and other electrical equipment have become more and more popular. One of the very important reasons is that it can meet the needs of environmental protection, energy saving and effective reduction of carbon dioxide emissions. At the same time, with the continuous improvement of the comprehensiv...

AI Technical Summary

Problems solved by technology

The same disadvantage is that the addition of Sn and Cu will cause a substantial increase in production costs, and high-temperature coiling, high-temperature final rolling and other means are required for assistance, special slab heating and rolling equipment are required, and the content of impurity elements such as S and N The control is very strict, all requirements are less than 0.0015%

[0009] The paper written by Hunady and Cernik reports that the silicon equivalent in the steel is strictly controlled to improve the phase transformation effect of the hot rolling and finishing rolling process, and then the favorable texture of the finished steel plate is controlled by the method of cold rolling and large reduction, and the reduction rate is as high as 91. %, the capacity of ordinary cold rolling mills is far from meeting the design requirements

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