Silicon content 3.2 weight is above, the cold-rolled steel strip for electromagnetic use

摘要

Thickness =0.70mm it possesses this invention, and it regards the cold-rolled steel strip or the seat metal which is used for electromagnetic use. As for the aforementioned strip, C: 0.01 weight %, Si: 3.2 - 7 weight %, Al: 2 weight %, Mn: The 1 weight %, it consists of the steel which contains the remainder which is the iron and the impurity. Melting, the starting material, for example, throb, thin throb, or thin after forming the strip, it casts the aforementioned product, heats next and makes T _R1000C, and the heat rolls at hot rolling temperature T _{F800C and} forms the hot strip. Next, the strip where the description above is heated, it is above the 750C, but from the temperature T _{C which} is under the 850C, at cooling rate T/t above 400C/amount, it cools to temperature under the 300C. After the cooling, the steel strip, finishing, for example, it attaches mechanical scale removal and/or on etching. After the description above the finishing, at maximum temperature T _CR500C cold it rolls the steel strip, annealing does next.