The invention provides a method for producing grain-oriented
silicon steel with single cold rolling, comprising: 1)
smelting, refining and
continuous casting to obtain a
casting blank; 2) hot rolling; 3) normalization, i.e. normalizing annealing and cooling; 4) cold-rolling, i.e. single cold rolling at a cold rolling
reduction rate of 75-92%; 5) decarburizing annealing at 780-880° C. for 80-350 s in a protective
atmosphere having a due point of 40-80° C., wherein the total
oxygen [0] in the surface of the decarburized sheet: 171 / t≦[O]≦313 / t (t represents the actual thickness of the steel sheet in mm), the amount of absorbed
nitrogen: 2-10 ppm; 6) high temperature annealing, wherein the
dew point of the protective
atmosphere: 0-50° C., the temperature
holding time at the first stage: 6-30 h, the amount of absorbed
nitrogen during high-temperature annealing: 10-40 ppm; 7) hot-leveling annealing. The invention may control the primary recrystallization
microstructure of steel sheet effectively by controlling the normalization process of
hot rolled sheet to form sufficient favorable (Al, Si)N inclusions from
nitrogen absorbed by slab during decarburizing annealing and low-temperature holding of high-temperature annealing, facilitating the generation of stable, perfect secondary recrystallization
microstructure of the final products. In addition, the invention avoids the
impact of nitridation using
ammonia on the underlying layer in prior art, and thus the formation of a good
glass film underlying layer is favored.