Low-iron-loss, low-aging and high-strength 50W800 non-oriented silicon steel and manufacturing method thereof

Abstract

The invention discloses low-iron-loss low-aging high-strength 50W800 non-oriented silicon steel and a manufacturing method thereof, and belongs to the technical field of silicon steel preparation. Themethod includes the steps of (1) molten steel smelting is performed, wherein the composition comprises the following components in percentage by weight: 0-0.005% of C, 0.4-1.3% of Si, 0.10-0.80% of Mn, 0.02-0.16% of P, 0.002-0.03% of O, less than or equal to 0.005% of Al, less than or equal to 0.006% of S, less than or equal to 0.008% of N, less than or equal to 0.01% of Nb, less than or equal to0.01% of V, less than or equal to 0.01% of Ti and the balance of Fe and inevitable impurities; the steelmaking technological process comprises the steps of molten iron pretreatment, converter steelmaking, RH refining and continuous casting to form a slab with the 230 mm section. (2) the continuous casting sheet billet is heated to 1100-1180 DEG C, hot rolling is conducted at 820-880 DEG C, finishrolling is conducted, and coiling is conducted at 650-720 DEG C; (3) after acid pickling, cold rolling is carried out, and the cold rolling deformation is 60-85%; (4) SACL rapid short-time high-temperature annealing is conducted, the annealing temperature ranges from 860 DEG C to 900 DEG C, then cooling and cleaning are conducted, and then the coating process is conducted; and finally, the non-oriented silicon steel with the iron loss P1.5 / 50 being smaller than or equal to 4.2 w / kg, the aging iron loss P1.5 / 50 degradation rate being smaller than or equal to 5%, the yield strength being 240-300 MPa, the iron loss being low, the aging being low and the machining performance being excellent is obtained.

Description

technical field [0001] The invention relates to cold-rolled non-oriented silicon steel and a preparation method thereof, in particular to a low iron loss, low aging and high-strength 50W800 non-oriented silicon steel and a manufacturing method thereof, belonging to the technical field of silicon steel preparation. Background technique [0002] Silicon steel is mainly used in the manufacture of compressors and motor cores. With the rapid development of the home appliance industry, in order to improve the efficiency of compressors and motors, reduce volume, and reduce weight, the electromagnetic performance requirements for electrical steel substrates are getting higher and higher. Low iron loss and high magnetic induction. In addition, in order to prolong the service life of motors and compressors, the number of users who clearly put forward the requirements for magnetic aging performance ("low aging iron loss" products) is gradually increasing, that is, the iron core made of...

AI Technical Summary

Problems solved by technology

Its Al content is relatively high, and the total components such as Sb and B are added at the same time, and the cost increase is too high

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