Production method for improving insulating property by adding trace elements in oriented silicon steel barrier-coat

Abstract

The invention discloses a production method for improving the insulating property by adding trace elements in an oriented silicon steel barrier-coat. The production method comprises the following steps of smelting, processing in vacuum, refining and continuously casting into a blank; carrying out hot rolling; normalizing and acid pickling; carrying out once cold rolling, wherein the reduction rate is greater than or equal to 82%; decarbonizing and annealing, wherein the temperature is 750-890 DEG C, the atmosphere dew-point temperature is 25-75 DEG C, the decarbonization time is 90-350 seconds, and the total oxygen [O] of the surface of a steel belt is greater than or equal to 170 / t and less than or equal to 315 / t; coating a magnesium oxide coating added with trace elements on the surface of the steel belt; carrying out high temperature annealing, wherein the atmosphere dew-point temperature is less than or equal to 30 DEG C, two low thermal insulation steps and one high thermal insulation step are arranged, and the nitridation amount of nitrogen is greater than or equal to 16ppm; stretching and smoothing and annealing, namely, coating, annealing and smoothing. In high temperature annealing stage, silicon dioxide and magnesium oxide on the surface of the steel belt carry out chemical reaction so as to generate a magnesium silicate bottom layer, and additives are added into the magnesium oxide coating so as to help to obtain excellent finished product magnetism and good magnesium silicate bottom layer.

Description

technical field [0001] The invention belongs to the field of oriented silicon steel production, in particular to a production method for adding trace elements to an isolation coating of oriented silicon steel to improve insulation performance. Background technique [0002] 1. Traditionally, the general production method of cold-rolled grain-oriented silicon steel is as follows: [0003] ⑴. Use a converter (or electric furnace) to make steel, carry out vacuum treatment, component refining and alloying, and continuously cast into slabs. The basic chemical components are: Si (2.5-5.0), C (0.01-0.10), Mn (0.02 ~0.10), S (0.01~0.05), Als (0.01~0.05), N (0.003~0.015), and some composition systems also contain one or more of Mo, Sb, Cr, B, Bi and other elements, The rest is iron and unavoidable impurity elements, and sometimes the product may also contain Cu; [0004] (2) Before hot rolling, heat the slab to a temperature of about 1400°C in a special heating furnace, and keep it ...

AI Technical Summary

Problems solved by technology

[0014] ⑷. Due to the high heating temperature of the slab, the heating furnace needs to be repaired frequently, and the utilization efficiency is low. At the same time, the billet is burned, the energy consumption is high, and the hot-rolled edge cracks are large, resulting in difficult production in the cold-rolling process, low yield rate, and high overall cost. ;

[0015] ⑸. High-temperature slab heating The production process of general cold-rolled oriented silicon steel is complicated, with high technical content and large investment in production equipment

After more than half a century of development, this technology has become very mature and has made great contributions to the development of the electric power and electronics industries. The blockade has restricted the rapid development of its output, especially in countries with rapid economic development like China, which often cannot meet the rapidly increasing market demand

Images