High magnetic induction oriented silicon steel and manufacturing method thereof

Abstract

The invention relates to high magnetic induction oriented silicon steel and a manufacturing method thereof. The silicon steel comprises the following components in percentage by mass: 0.01-0.08% of C, 2.8-3.4% of Si, 0.02-0.30% of Mn, 0.010-0.04% of S, 0.005-0.05% of Als, 0.003-0.010% of N, 0.005-0.5% of TI, 0-0.6% of Cu, 0-0.2% of Sn, less than 0.004% of O, less than 0.01% of P and the balance of Fe. The manufacturing method comprises the following steps: (1) smelting molten steel; (2) carrying out continuous casting by adopting a twin-roll strip continuous casting device to obtain a cast strip; (3) cooling and then carrying out hot rolling, and then cooling and coiling; (4) carrying out normalizing annealing on a hot rolled coil, and carrying out controlled cooling to room temperature; (5) carrying out acid washing and then cold rolling, then carrying out decarburizing, and coating an annealing isolation agent; (6) annealing at high temperature, and then carrying out purification annealing. The manufacturing method disclosed by the invention is simple and effective and has the characteristics of short process, easiness in control and low energy consumption; the silicon steel has excellent properties.

Description

technical field [0001] The invention belongs to the field of electrical steel manufacturing, and in particular relates to a high magnetic induction oriented silicon steel and a manufacturing method thereof. Background technique [0002] The silicon content of grain-oriented silicon steel is about 3% (mass fraction), and it is composed of a single Gaussian orientation ({110}<001>) grain. When magnetized along the rolling direction, the magnetic induction is very high and the iron loss is very low. It is mainly used for the production of transformers. Iron core; according to the level of magnetic induction, oriented silicon steel products can be divided into two types: common oriented silicon steel (CGO) and high magnetic induction oriented silicon steel (Hi-B). High magnetic induction oriented silicon steel has higher magnetic induction and lower iron loss . [0003] The current production process of high magnetic induction oriented silicon steel is: smelting→secondary...

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Problems solved by technology

[0003] The current production process of high magnetic induction oriented silicon steel is: smelting→secondary refining and alloying→continuous casting→heating→hot rolling→normalization→pickling→cold rolling→decarburization annealing→coating annealing with MgO as the main component Release agent → high temperature annealing → smooth stretching annealing → coating insulation layer → laser treatment → cutting and packaging; the current high magnetic induction oriented silicon steel manufacturing method has serious shortcomings: the production process is complicated, the production process is long, and the cost is very high; To fully dissolve the inhibitor, the continuous casting slab needs to be heated in a special high-temperature heating furnace with a maximum temperature of 1400°C. Due to the high heating temperature and serious burning loss, the heating furnace needs frequent repairs and the utilization rate is very low; at the same time, the current The manufacturing method also has shortcomings such as many product defects, low yield, high energy consumption, and serious environmental pollution; as the objective demand for energy saving and emission reduction becomes more urgent, how to simplify the production process of high magnetic induction oriented silicon steel, reduce energy consumption, and reduce pollution, Cost reduction has become the goal pursued by metallurgists

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