High-magnetic-induction oriented silicon steel prepared through thin slab continuous casting and rolling and preparation method thereof

Abstract

The invention provides high-magnetic-induction oriented silicon steel prepared through thin slab continuous casting and rolling and a preparation method thereof. The oriented silicon steel comprises the following chemical components by mass percent: 0.035-0.055% of C, 2.9-3.3% of Si, 0.09-0.15% of Mn, 0.1-0.2% of Cu, not more than 0.005% of S, 0.02-0.04% of AlS, 0.009-0.013% of N and 0.1-0.2% of Sn. The oriented silicon steel is prepared by the following steps: thin slab continuous casting, heating in a soaking pit, hot continuous rolling, normalizing, primary cold rolling, decarburizing annealing and high temperature annealing, wherein the heating temperature of the soaking pit is 1150-1180 DEG C and the soaking time is 30-60 minutes. The oriented silicon steel uses AlN as a main inhibitor and Cu2S as an auxiliary inhibitor, and meanwhile, the trace element Sn is added to the chemical components to avoid the problem of inadequate inhibiting capacities of the inhibitors caused by low temperature heating and serves as an auxiliary inhibitor thanks to the segregation capacity of Sn on the grain boundary. Therefore, the high-magnetic-induction oriented silicon steel can be produced by adopting the thin slab low temperature short-time soaking process, so that the casting blank heating temperature is effectively reduced and the soaking time is reduced. The preparation method has the advantages of short flow, low cost, low energy consumption, high production efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to thin slab continuous casting and rolling high magnetic induction oriented silicon steel and a preparation method thereof. Background technique [0002] In order to develop perfect secondary recrystallization in the traditional oriented silicon steel production process, it is necessary to re-dissolve the coarse MnS and other particles in the slab into the matrix. Therefore, the heating temperature of the traditional oriented silicon steel slab is 1350 ℃ ~ 1400 ℃, so high The high heating temperature brings about a series of problems such as large energy consumption, short life of the heating furnace, and unstable magnetic properties (Qiu Shengtao, Fu Bing, Xiang Li, Cheng Guoguang, Research and Development Progress and Trend of High Magnetic Induction Oriented Silicon Steel Production Technology and Process, Iron and Steel , 2013, 48 (3): 1-8), and this high energy consumpt...

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Problems solved by technology

[0004] The purpose of the present invention is to obtain a thin slab continuous casting and rolling high magnetic induction oriented silicon steel and its preparation method. The magnetic properties of the obtained oriented silicon steel can reach high magnetic induction oriented silicon 30Q120, and some properties can reach 30Q110. The preparation method has the advantages of short process and low cost. Low energy consumption, high production efficiency and other advantages can overcome the problems of high energy consumption, short life of heating furnace and unstable magnetic properties caused by high temperature heating of oriented silicon steel in the traditional process in the prior art

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