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Method for producing oriented silicon steel

A technology for oriented silicon steel and products, which is applied in rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problems of high energy consumption of oriented silicon steel, imperfect secondary recrystallization, large temperature difference between slab surface and core, etc. To achieve the effect of simple and easy technology, good application prospects, and perfect finished product organization

Active Publication Date: 2007-05-09
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of high energy consumption, low efficiency of heating furnace, large side cracks of hot-rolled slabs, poor productivity, high cost and large temperature difference between the slab surface and the core in the production of oriented silicon steel by the traditional high-temperature slab heating method. and other inherent shortcomings, as well as the resulting low production efficiency and prone to imperfect secondary recrystallization and other problems

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  • Method for producing oriented silicon steel

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Embodiment 1

[0020] Using 500kg vacuum furnace to make steel, the chemical composition (Wt%) is C=0.055, Si=3.8, Als=0.030, N=0.008, Mn=0.05, Sn=0.005, Cu=0.03, P=0.01, S=0.020. By this component cast slab under different processes ((A) utilizing coal gas to be directly heated to solid solution temperature; B) the process of the present invention), the surface of the slab and the core are embedded with thermocouples for temperature measurement, and the result of the present invention causes Surface and core temperature differences are minimal (Table 1).

[0021] Utilize the process of the present invention to heat the slab to 1280°C, 1295°C and 1310°C respectively, then keep warm at each temperature for 20, 30, and 45 minutes, and then rapidly raise the temperature of the slab to 1380°C at a speed of 5, 15°C / min. ℃, keep warm for 45 minutes or heat up to 1350 ℃, keep warm for 30 minutes. Then use the following typical process to experiment until the final product: hot rough rolling to 40m...

Embodiment 2

[0026] Using the grain-oriented silicon steel smelted in the above experiment, and the two reheating temperature time systems in Table 1 (directly heating to 1380°C and first heating to 1310°C, and holding it for 45 minutes, then heating to 1380°C at 15°C / min, the The ingot is heated up to 1380° C. and kept for 45 minutes). After hot rough rolling to 40mm. Then use the usual 6-pass hot finish rolling process to directly roll the hot-rolled slab to 2.5mm or immediately spray water to cool to 400°C, 450°C and 500°C after six passes of finish rolling; 1 pass or 2 passes of rolling, the total reduction rate is 5-25%, the slab is rolled to 2.5mm, and then sprayed with water to cool to room temperature. Then one cold rolling to 0.85mm; 880°C intermediate annealing; second cold rolling to 0.30mm; 850°C, 140s decarburization annealing; finally MgO coating, and high temperature annealing at 1200°C for 25h and measuring the magnetic properties to get the results in Table 2 .

[0027] ...

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Abstract

This invention discloses a method for producing oriented silicon steel. The method comprises: re-heating common oriented silicon steel plate green body, hot-rolling, acid-washing, cold-rolling and annealing to obtain the final product. After conventional hot-rolling, cold water is immediately sprayed to cool the silicon steel plate to 400-500 deg.C. Then one pass or multiple passes rolling with a total reduction rate of 5-25% is performed in the temperature range so that the steel green body reaches its final thickness. Finally, cold water is sprayed to cool to room temperature. The method solves the problems of high energy consumption, low furnace utilization efficiency, large crack of hot-rolled plate, low processability, high cost and large temperature difference between plate core and plate surface faced by present techniques. The method can control the perfection of recrystallization, thus can ensure perfect GOSS structure of the final product. The method is simple, and can improve the magnetism of oriented silicon steel, thus has wide potential applications.

Description

technical field [0001] The utility model relates to the field of metal manufacturing, in particular to a method for producing oriented silicon steel. Background technique [0002] The typical production method of grain oriented silicon steel is as follows: [0003] Use a converter (or electric furnace) to make steel, carry out secondary refining and alloying, and continuously cast into a slab. Its basic chemical composition is Si (2.5-4.5%), C (0.01-0.10%), Mn (0.03-0.1%) ), S (0.012-0.050%), Als (0.01-0.05%), N (0.003-0.012%), and some component systems also contain one or more of Cu, Mo, Sb, B, Bi and other elements , and the rest are iron and unavoidable impurity elements; the slab is heated to a temperature above 1350°C in a special high-temperature heating furnace, and is kept for more than 30 minutes to make the beneficial inclusions fully solid-solution, so that they can be used in the subsequent hot rolling process In the silicon steel matrix, fine and dispersed se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12B21B37/16B21B37/44
Inventor 胡卓超李国保刘献东孙焕德宿德军杨国华杨勇杰吴培文
Owner BAOSHAN IRON & STEEL CO LTD