Production method for manufacturing cold-rolled oriented silicon steel with high magnetic strength by using generally oriented steel raw material

Abstract

The invention discloses a production method for manufacturing cold-rolled oriented silicon steel with high magnetic strength by using a generally oriented steel raw material. The method comprises the following steps: (1) smelting, carrying out vacuum treatment, refining and continuously casting into a billet; (2) carrying out hot rolling; (3) normalizing and pickling; (4) wherein the single cold rolling pressure ratio is greater than or equal to 82%; (5) decarburizing annealing temperature; (6) annealing at high temperature, setting low thermal insulation of two steps, and high thermal insulation of one step, wherein the nitriding amount of an N gas is greater than or equal to 16ppm; (7) stretching, leveling and annealing, namely, pickling, coating, annealing and leveling. Gauss texture and nucleation are formed by the big pressure rate by cold rolling one time or twice, inclusions with enough quantity are formed by nitriding at an earlier stage of high-temperature annealing, development, stabilization and perfection of gaussian grains are recrystallized for the second time by using the enhanced inhibiting effect. By adopting the process, the magnetic property and the orientation degree of the product are improved when the silicon steel is produced by using the generally oriented silicon steel material, so that the property of the oriented silicon steel is improved, and high grade of cold-rolled oriented silicon steel 27Q105 is produced.

Description

technical field [0001] The invention belongs to a production method for manufacturing high magnetic induction cold-rolled oriented silicon steel by using common oriented steel raw materials. Background technique [0002] 1. Traditionally, the production methods of cold-rolled grain-oriented silicon steel and the grades that can be produced are as follows: [0003] ⑴Converter (or electric furnace) steelmaking, vacuum treatment, component refining and alloying, continuous casting into slab, its basic chemical composition is: 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), some composition systems also contain one or more of Mo, Sb, Cr, B, Bi and other elements, the rest It 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 warm for more than 30 minutes, so that the...

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Problems solved by technology

[0014] (4) 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] (5) High-temperature slab heating The production process of general cold-rolled grain-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

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