Cold rolled electromagnetic steel sheet used for rapid cycling synchrotron and producing method thereof

Abstract

A cold rolled electromagnetic steel sheet for rapid cycling synchrotron, and a manufacturing method thereof, the method includes the steps of 1) smelting and casting, the composition of the cold rolled electromagnetic steel sheet is C 0.001-0.003 wt %, Si 0.60%-0.90 wt %, Mn 0.40%-0.70 wt %, P≦0.04 wt %, Al 0.60-0.80 wt %, S≦0.0035 wt %, N≦0.003 wt %, and the rest is Fe; smelting and RH refining, and then casting to form semi-finished product; 2) hot rolling; 3) normalizing, in which the normalizing temperature is controlled between 960° C.-980° C., and the normalizing time is 30-60 sec; 4) pickling and cold rolling; 5) annealing, wherein the annealing temperature is controlled to be between 850° C.-870° C., and the annealing time is 13-15 sec; 6) obtaining non-oriented silicon steel product after coating. The cold rolled electromagnetic steel sheet of the present invention has low coercivity, specifically in case that the magnetizing intense returns to zero after reaching 10 Oersted (Oe), the coercivity of the material is Hc≦79.6 A/m; high magnetic induction, which is B50≧1.75 T; and low iron losses of P15/50≦4.2 W/kg, and the iron losses after strain-annealing is P15/50≦3.5 W/kg.

1 . A cold rolled electromagnetic steel sheet for a rapid cycling synchrotron, the composition of which is C 0.001-0.003 wt %, Si 0.60%-0.90 wt %, Mn 0.40%-0.70 wt %, P≦0.04 wt %, Al 0.60-0.80 wt %, S≦0.0035 wt %, N≦0.003 wt %, and the rest are Fe and unavoidable impurities. 
     
     
         2 . A method for manufacturing cold rolled electromagnetic steel sheet for rapid cycling synchrotron as in  claim 1 , including the steps of:
 1) smelting and casting,
 wherein the composition of the cold rolled electromagnetic steel sheet is C 0.001-0.003 wt %, Si 0.60%-0.90 wt %, Mn 0.40%-0.70 wt %, P≦0.04 wt %, Al 0.60-0.80 wt %, S≦0.0035 wt %, N≦0.003 wt %, and the rest are Fe and unavoidable impurities; 
 wherein carrying out smelting, RH refining under the said composition, and then casting liquid steel to form semi-finished product, wherein when the RH refining is finished, contents of free oxygen in the liquid steel is lower than 25 ppm; 
   2) hot rolling;   3) normalizing, in which normalizing temperature is controlled between 960° C.-980° C., and normalizing time is 30-60 sec;   4) pickling and cold rolling;   5) annealing, wherein annealing temperature is controlled to be between 850° C.-870° C., and the annealing time is 13-15 sec;   6) obtaining non-oriented silicon steel product after coating.   
     
     
         3 . The method for manufacturing a cold rolled electromagnetic steel sheet for rapid cycling synchrotron according to  claim 2 , wherein an average size of grain in the steel sheet is more than 40 μm. 
     
     
         4 . The method for manufacturing cold rolled electromagnetic steel sheet for rapid cycling synchrotron according to  claim 2 , wherein an average size of grain in the steel sheet is controlled to be between 40-45 μm.