Method for preparing oriented high-silicon steel through thin-strip continuous casting

Abstract

The invention discloses a method for preparing oriented high-silicon steel through thin-strip continuous casting. The method comprises the following steps: smelting, performing thin-strip continuous casting, performing multi-pass warm rolling, rapidly cooling through water quenching, performing acid pickling, performing cold rolling, coating with an isolating layer and performing annealing treatment, wherein in the step of rapidly cooling through water quenching, a strip material is rapidly cooled through water quenching to 300 DEG C or below and the cooling speed is higher than or equal to 20DEG C / s; in the step of coating with the isolating layer, the surface of the strip material is coated with a layer of a mixed solution of SiO2 and Al2O3 and is dried at the temperature of 300-450 DEGC; in the step of performing annealing treatment, the strip material obtained after coating is dried is rapidly heated to 900 DEG C or above, the heating speed is 5-10 DEG C / s, heat is preserved for30-60 minutes, then the temperature is raised to 1150-1200 DEG C, heat is preserved for 8-52 hours, the temperature is slowly lowered to room temperature, and the cooling speed is lower than or equalto 5 DEG C / s. By the method, the production cycle is short, the yield is high, and the prepared orientated high-silicon steel has excellent magnetic performance.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to a method for preparing oriented high-silicon steel by continuous casting of thin strips. Background technique [0002] As we all know, for Fe-Si alloy, with the increase of Si content, especially when the Si content exceeds 5% (that is, high silicon steel), the alloy becomes hard and brittle, and the processing performance deteriorates sharply. However, the excellent magnetic properties and wide application prospects of high-silicon steel materials have attracted a lot of research and development work. [0003] (1) Traditional rolling process [0004] Since T.Ishizaka et al first prepared a 0.3mm thick 6.5% Si silicon steel strip by hot rolling-cold rolling in 1966, people have been working hard to make the process of preparing high silicon steel sheet as simple, economical and operable as possible. , and achieved some results. For Super Sendust alloy, a thin plate of 0.05-0.30mm ca...

AI Technical Summary

Problems solved by technology

Although the CVD process has been successful, there are still the following problems: 1) The deposition temperature is high, the energy consumption is large, the equipment is corroded seriously, and the life is shortened; 2) The CVD process relies on SiCl 4 Formation of Fe by corroding the iron surface 3 Si is deposited on the surface, which will cause corrosion pits and unevenness on the surface, which requires warm rolling and leveling, which brings inconvenience to production; The silicon content in the inner part gradually decreases, usually 6.5% Si on the surface, and only 3.5% Si in the center, that is, gradient silicon, and its magnetic properties are very different from those of products with full 6.5% Si

4) Produce FeCl by CVD process 2 , the exhaust gas not only seriously pollutes the environment, but also causes the loss of iron

[0020] In the above-mentioned existing high-silicon steel preparation processes, except for the CVD method, multiple repeated processes such as rolling, annealing, rolling, and annealing are used, resulting in long processing cycles, low yields, and high energy consumption. , the magnetic properties cannot reach the optimum range

There are also researchers who add Cu, Cr, P, B and other trace elements to Fe-6.5% (mass) Si molten steel. Although some plasticity and workability can be improved, the final product has poor magnetic properties.