A kind of grain-oriented pure iron manufactured by secondary cold rolling method and method

Abstract

The invention relates to grain-oriented pure iron manufactured through a secondary cold rolling method and a method for manufacturing the pure iron. The method comprises the following steps of converter smelting, RH-vacuum degassing refining, continuous casting, plate blank heating, hot rolling, cold rolling and high-temperature annealing, wherein in the step of continuous casting, an obtained continuous cast plate blank comprises, by mass, 0.01-0.08% of C, 0.01-1.0% of Si, 0.05-0.5% of Mn, 0.005-0.05% of Als, 0.005-0.02% of N, 0.01-0.1% of P, 0.003-0.01% of S, and the balance Fe; in the step of hot rolling, the mass percent of the content of obtained gamma phases during finish rolling is controlled to be 10-30%; and in the step of cold rolling, double cold rolling and intermediate annealing are included. According to the method, the grain-oriented pure iron with the high-saturation induction density, the sharp preferred orientation and excellent DC magnetic properties can be obtained by using existing production equipment through composition design and the means such as rational cooperation of compositions of an inhibitor and proper setting of the rolling and heat treatment processes.

Description

technical field [0001] The invention belongs to the technical field of production of electric soft magnetic materials, and in particular relates to a grain-oriented pure iron manufactured by a secondary cold rolling method and a method thereof. Background technique [0002] Electrical pure iron is the most widely used iron-based soft magnetic material. The purity of Fe is above 99.5%. It has good soft magnetism, the saturation magnetic induction is as high as 2.16T, and the coercivity c Low, high magnetic permeability μ and magnetic induction B, good processability and weldability, simple manufacturing process, and low cost. However, due to its low resistivity, generally 10-12Ω·m, the eddy current loss of the finished product is high and the total iron core loss is high. Therefore, it is mainly used in electromagnets and magnetic shielding materials, and is only suitable for the manufacture of electrical components used under DC. Including high-energy accelerator electromag...

AI Technical Summary

Problems solved by technology

Although the major grain-oriented silicon steel manufacturers ensure the sharp {110} preferred orientation through fine manufacturing processes, the limitation of the saturation magnetic induction of ferrosilicon alloys leads to the unsatisfactory magnetic induction of commercial grain-oriented silicon steel in the market. Among them, B of High Magnetic Sensitivity Oriented Silicon Steel HiB 800 Generally lower than 1.92T, the B of ordinary magnetic induction oriented silicon steel CGO 800 Generally lower than 1.90T

At the same time, the heating temperature of the slab in the traditional oriented silicon steel production process is too high, the heating temperature is 1350-1400 ℃, the heating temperature of the medium-temperature oriented silicon steel slab developed subsequently is 1250-1350 ℃ and the low-temperature oriented silicon steel slab has gradually matured in recent years The heating temperature is about 1250°C, but they are also higher than the soaking temperature of most types of steel. High temperature heating has brought huge pressure on the yield, magnetism, energy consumption and equipment maintenance of oriented silicon steel.