Manufacturing method of Sn contained non-oriented electrical steel and plate coil

Abstract

The invention discloses a method for preparing a Sn-containing non-oriented electrical steel, including a continuous casting process, a heating process, a rolling process and a cooling process. In the continuous casting process, the molten steel overheating is controlled in a liquidus line +15-30 DEG C. A crystallizer adopts a sine vibration curve with a vibration frequency of 260-300time / s and an amplitude of 6-7mm. A casting speed of the continuous casting is 3.0-4.5m / min. The cooling water distribution form after two cooling curve crystallizers is a sine curve. The cooling water volume is 5000L-7000L / min. Protective slag of the crystallizer is superlow carbon protective slag. The heating system adopts a tunnel kiln and heats at 1150+ / -20DEG C. The continuous rolling process comprises: a beginning rolling temperature of 1070+ / -30 DEG C, a final rolling temperature of 800-900 DEG C, and a reeling temperature of 650-750 DEG C. A depressing system includes that: a relative depressing rate of former two racks is 40-65%, the relative depressing rate of the third to the fifth racks is 30-45%, the relative depressing rate of the sixth rack is 15-35%, and the relative depressing rate of the seventh rack is less than or equal to 20%. The cooling process adopts cooling between the racks and secondary descaling of F1-F2 and the F2-F3, and laminar flow cooling for the back segment cooling.

Description

technical field [0001] The invention belongs to the field of electrical steel, and in particular relates to a method for producing Sn-containing non-oriented electrical steel sheet coils by using a thin slab continuous casting and rolling process. Background technique [0002] Chinese patent 01124458.5 discloses a non-oriented electrical steel sheet for small precision motors, its chemical composition weight percent is: carbon ≤ 0.005%, silicon 0.05 to 4.0%, manganese 0.1 to 1.5%, phosphorus ≤ 0.15%, sulfur 0.008 to 0.014% %, soluble aluminum ≥ 0.15%, nitrogen ≤ 0.01%, T.0 ≤ 0.02%, tin: 0.01 to 0.3%. Its purpose is to keep the shear area ratio of the steel plate stable through a reasonable ratio of tin and sulfur, thereby keeping the incidence of connection between the steel plate and the copper wire at a low level. Tin can improve the magnetic induction of electrical steel B 50 , but its downside is too low, there is no effect, the upper limit is too high, segregation is ...

AI Technical Summary

Problems solved by technology

However, the traditional method has a long process and high production cost

[0003] The thin slab continuous casting and rolling process is short, and the production cost is lower than that of the traditional process. Due to reasons such as equipment configuration and immature technology, the thin slab continuous casting and rolling production line has no precedent for producing Sn-containing non-oriented electrical steel sheets, and cannot provide a large number of Sn-containing non-oriented electrical steel sheet urgently needed by the market