A kind of grain-oriented silicon steel with excellent magnetic properties and its production method

Abstract

The invention discloses oriented silicon steel with excellent magnetic property. The oriented silicon steel comprises the following components in percentage by weight: 0.015%-0.075% of C, 2.80%-3.50% of Si, 0.06%-1.80% of Mn, 0.010%-0.020% of Als, 0.0050%-0.0090% of N, no more than 0.0030% of S, and no more than 0.20% of one or composition of more of P, CU, Mo, Sb and Cr. The method comprises the following production steps: smelting; continuously casting into blanks; heating the casting blanks; carrying out hot rolling; coiling; normalizing; conventionally pickling and carrying out cold rolling to reach the thickness of a product; decarbonizing and annealing in a conventional protective atmosphere; coating with a conventional isolation agent; carrying out conventional annealing at a high temperature; and carrying out post procedures. According to the oriented silicon steel, the heating temperature of the casting blanks does not exceed 1280 DEG C; the normalizing temperature is 750-1050 DEG C; nitriding is not required; and the finished oriented silicon steel product of which the magnetic property B800 is greater than or equal to 1.91T and P17 / 50 is smaller than or equal to 1.14W / kg is produced by adopting a one-step cold rolling method.

Description

technical field [0001] The invention relates to an oriented silicon steel and a production method thereof, in particular to an oriented silicon steel with excellent magnetic properties and a production method thereof, which is suitable for production by adopting a casting slab with a thickness of more than 230 mm. Background technique [0002] At present, the heating temperature of the cast slab for the production of oriented silicon steel is mostly 1400°C. Heating at such a high temperature will result in increased oxide slag, large burning loss, reduced yield, high furnace repair frequency, increased manufacturing cost, and many product surface defects. insufficient. In order to solve this problem, people study to reduce the low temperature of casting slab heating, that is, control the heating temperature ≤ 1280 ° C, such as the Russian (AlN+Cu) composition system using inherent inhibitors and the German ThyssenKrupp Cu 2 S series; 2) The nitriding process after hot rolli...

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned typical production method of low-temperature heating billet, although the magnetic properties can be improved, the respective shortcomings are: the existence of the Russian (AlN+Cu) series process requires increasing the copper content, that is, at 0.50%. The process adopts the secondary cold rolling method for production

Although this document does not require nitriding treatment, it needs to undergo secondary cold rolling, which will reduce the yield and increase production costs

Images