The 3 kinds of non-oriented silicon steel (/% : 0.004-0.006C

1.31-1.38Si

0.34-0.41Mn

0.004S

0.027P

0.36-0.41Als

0.0022-0.0028 T[O

]

0.0048-0.0060N) - non containing Ca and B

containing Ca (0.0026% Ca)

and containing Ca-B (0.0027% Ca and 0.0045% B) is melted by a 6.5 kg vacuum induction furnace

forged to 70 mm flat blank

hot-rolled to 2.5 mm plate

normalized at 950 °C and cold-rolled to 0.5 mm sheet then in 30% H

2

+ 70% N

2

atmosphere annealed at 920 for 3 min

furnace cooling. Test results show that with adding calcium treatment the CaO • 6A1

2

O

3

and

CaS form in the non-oriented silicon steel it is available to inhibit the deposition of MnS precipitate and favourable to promote the grain growth ； in annealed cold-rolled sheet of non-oriented silicon steel containing Ca and B

the BN has not been found； the annealed cold-rolled sheet of steel containing 0.0026%Ca has strongest

{100}

face texture and Goss texture； while that of steel containing 0.0027% Ca and 0.0045% B has weakest {112}

<

110>texture. In three heats of test steels

the comprehensive magnetic property of the steel containing 0.002 6% Ca is best i. e. its iron loss P

1.5/50

and magnetic induction B

50

are respectively 4.32 W/kg and 1.764 T.