Asymmetrical rolling method for producing high-grade non-oriented silicon steel
An oriented silicon steel, asymmetric technology, applied in the direction of metal rolling, can solve the problems of steel grade cold workability, brittle and hard texture, coarse grains, etc., and achieve the effect of improving electromagnetic properties
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Embodiment 1
[0015] Example 1: C: 0.0027%, Si: 1.57%, Mn: 0.22%, P: 0.008%, S: 0.0013%, Als: 0.99%, N: 0.0019%, Ti: 0.001%, Nb: 0.0012%, V :0.0016%;
[0016] The rest is iron and other unavoidable impurity elements.
[0017] The process steps are as follows:
[0018] a) Hot rolling: the billet heating temperature is 1100°C, the rolling start temperature is 1020°C, the final rolling temperature is 870°C, and the coiling temperature is 700°C;
[0019] b) Normalization: temperature 920°C, unit speed 35m / mim;
[0020] C) Cold rolling: asymmetric rolling is introduced in the last two passes, the diameters of the upper and lower rolls are different, the diameter of the small roll: the diameter of the large roll is 0.85, the cold rolling is carried out in 4 passes, the first two passes are symmetrical rolling, the total pressure The reduction ratio is 68%, and the reduction ratios of the last two asymmetric rolling passes are: 31.8% and 30.3% respectively;
[0021] d) Finished product anneali...
Embodiment 2
[0022] Example 2: C: 0.0028%, Si: 2.8%, Mn: 0.20%, P: 0.008%, S: 0.0020%, Als: 0.74%, N: 0.0015%, Ti: 0.0011%, Nb: 0.0014%, V :0.0017%;
[0023] The rest is iron and other unavoidable impurity elements.
[0024] The process steps are as follows:
[0025] a) Hot rolling: the billet heating temperature is 1100°C, the rolling start temperature is 1020°C, the final rolling temperature is 870°C, and the coiling temperature is 700°C;
[0026] b) Normalization: temperature 925°C, unit speed 30m / mim;
[0027] C) Cold rolling: asymmetric rolling is introduced in the last two passes, the diameters of the upper and lower rolls are different, the diameter of the small roll: the diameter of the large roll is 0.80, the cold rolling is carried out in 5 passes, the first three passes are symmetrical rolling, the total pressure The reduction ratio is 69.1%, and the reduction ratios of the last two asymmetric rolling passes are: 31.7% and 29.6% respectively;
[0028] d) Finished product ann...
Embodiment 3
[0029] Example 3: C: 0.0025%, Si: 3.39%, Mn: 0.16%, P: 0.009%, S: 0.0023%, Als: 0.94%, N: 0.0011%, Ti: 0.0013%, Nb: 0.0015%, V :0.0014%;
[0030] The rest is iron and other unavoidable impurity elements.
[0031] The process steps are as follows:
[0032] a) Hot rolling: the billet heating temperature is 1100°C, the rolling start temperature is 1020°C, the final rolling temperature is 870°C, and the coiling temperature is 700°C;
[0033] b) Normalization: temperature 940°C, unit speed 38m / mim;
[0034] C) Cold rolling: asymmetric rolling is introduced in the last two passes, the diameters of the upper and lower rolls are different, the diameter of the small roll: the diameter of the large roll is 0.75, the cold rolling is carried out in 6 passes, the first four passes are symmetrical rolling, the total pressure The reduction ratio is 67.7%, and the reduction ratios of the last two asymmetric rolling passes are: 32.9% and 28.3% respectively;
[0035] d) Finished product ann...
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