Orientating silicon steel, manufacturing process and equipment thereof

Abstract

This invention relates to an oriented silicon steel and its processing method and equipment. It comprises of 0.035~0.060% of C, 2.5~3.5% of Si, 0.08~1.8% of Mn, 0.005~0.010% of S, 0.015~0.035% of Al, 0.0050~0.0090% of N, 0.01~0.15% of Sn, 0.010~0.030% of P and 0.05~0.12% of Cu, with the rest iron. The processing method includes: a) smelting; b) hot rolling. Billets are heated to 1100~1200 deg.C and rolling temperature is lower than 1200 deg.C with a finishing temperature of above 850 deg.C and a coiling temperature of below 650 deg.C; c) normalizing. Hot-rolled boards are normalizing annealed at 1050~1180 deg.C for 1~20 seconds and 850~950 deg.C for 30~200 seconds and then cooled quickly; d) cold rolling. Boards are rolled to product thickness by one-off cold rolling or repetitious cold rolling with intermediate annealing; e) nitriding, decarbonization and high-temperature and hot-leveling annealing with boards coated with high-temperature annealing isolation agents mainly made of MgO.

Description

technical field [0001] The invention relates to a kind of oriented silicon steel and its production method, which is characterized in that the inhibitor required for secondary recrystallization is obtained through steel plate nitriding (Nitriding), and a perfect Goss structure is formed during final high-temperature annealing, and a glassy film on the surface is formed. The finished product of grain-oriented silicon steel with the same shape as the traditional grain-oriented silicon steel can be obtained. Background technique [0002] Traditionally, the 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 (30-120ppm), and some component systems also contain one of Cu, Mo, Sb, Cr, B, Bi and other elements ...

AI Technical Summary

Problems solved by technology

[0008] (4) Due to high temperature heating, the burning loss is large, the heating furnace needs frequent repairs, the utilization rate is low, and at the same time, the energy consumption is high; the edge cracks of the hot-rolled coil are large, resulting in difficult production in the cold rolling process, low yield and high cost

[0033] (1) A special high-temperature heating furnace must be used;

[0034] (2) Due to the high temperature heating, the slag on the surface of the slab is serious, so the heating furnace must be repaired frequently, the maintenance cost is high, and the operating rate of the furnace is low;

[0035] (3) The thickness of the slab is generally 200-250mm. In order to heat evenly, it must be heated for a long time, and the energy consumption is high;

[0036] (4) The columnar grains in the slab are developed, and the grain boundaries are oxidized, resulting in serious edge cracks, poor productivity in the subsequent process, low yield, and high production costs