High magnetic induction grain-oriented silicon steel with B800 being more than or equal to 1.94T and production method thereof

The invention discloses high magnetic induction grain-oriented silicon steel with B800 being more than or equal to 1.94T. The silicon steel comprises the following components in percentage by weight: 0.045-0.075 percent of C, 2.95-3.35 percent of Si, 0.05-0.20 percent of Mn, 0.005-0.015 percent of S, 0.004-0.010 percent of N, 0.03-0.10 percent of Sn, 0.01-0.1 percent of Cu and 0.020-0.034 percent of Als. The production method comprises the following steps: smelting, performing continuous casting to form a blank, and heating the cast blank; performing segmented hot rolling; normalizing and cooling in a dry total-nitrogen atmosphere; performing aging and cold rolling by using a one-step cold rolling method; decarburizing and annealing; performing nitriding treatment; performing conventional coating of a release agent; coiling and performing conventional high-temperature annealing, wherein the annealing atmosphere refers to dry or wet nitrogen or hydrogen or conventional nitrogen and hydrogen mixed gas; and performing conventional stretching, flattening, papplying insulating coatings and annealing. The cast blank is heated at a low temperature, the process application range is wide, and the number of effective inhibitors is controlled, so that the B800 is more than or equal to 1.94T, and P1.7/50 is less than or equal to 0.88W/kg. The silicon steel is used for preparing common transformers, the materials can be saved, and the overload impact resistance can be improved.