Thin slab continuous casting and rolling ordinary grain oriented silicon steel containing vanadium and its manufacturing method

Abstract

The invention relates to thin slab casting and rolling process-based vanadium-containing ordinary oriented silicon steel and a manufacturing method thereof, belonging to the technical field of oriented electrical steel. The thin slab comprises the following chemical ingredients by weight percent: 0.025-0.055% of C, 2.5-4% of Si, 0.05-0.2% of Mn, 0.4-0.6% of Cu, 0.005-0.01% of S, 0.005-0.02% of Al, 0.004-0.02% of N, 0.001-0.02% of P, 0.002-0.02% of V, and the balance being Fe and inevitable impurities; the oriented silicon steel is prepared by the following steps: carrying out continuous casting on a thin slab, heating with a soaking pit, carrying out thermal continuous casting, carrying out primary cold rolling, de-carbonizing to anneal, carrying out secondary cold rolling, returning to anneal, coating a MgO parting agent, annealing at high temperature and cooling. The thin slab casting and rolling process-based vanadium-containing ordinary oriented silicon steel and the manufacturing method thereof have the advantages that due to the adoption of the thin slab casting and rolling process, the heating temperature of the slab is low, the soaking time is short, and the energy consumption amount is reduced; by adding a proper amount of V to form an assistant inhibitor, the inhibiting property is enhanced and the magnetic performance of a product is improved.

Description

technical field [0001] The invention belongs to the technical field of oriented electrical steel. In particular, it relates to a thin slab continuous casting and rolling vanadium-containing ordinary grain-oriented silicon steel and a manufacturing method thereof. Background technique [0002] In the production process of grain-oriented silicon steel, in order to allow the inhibitor elements to dissolve and re-precipitate in the subsequent hot rolling process, so as to obtain a large number of fine and dispersed inhibitor particles, high-temperature heating of the slab is the key. However, high-temperature heating has brought enormous pressure on grain-oriented silicon steel output, energy consumption, yield and equipment failure. Therefore, in recent years, the low-temperature billet heating process has gradually replaced the traditional high-temperature heating process and has become a research hotspot. [0003] At present, when the traditional slab process uses low-tempe...

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Problems solved by technology

Chinese patent applications 200510047294.4, 200710159088.1 and 200810229771.2 have done some research on the thin slab continuous casting and rolling process to produce oriented silicon steel, but their research results either have poor magnetic properties, only about 30Q150-30Q140, or the slab heating temperature is relatively high , greater than 1250°C, and no V-containing inhibitors were added

Therefore, in the prior art, the technology of producing V-containing ordinary oriented silicon steel with excellent properties by thin slab continuous casting and rolling has not been reported so far.