The W600 non-oriented silicon steel is produced by 120 t LD (top and bottom combined blown) -RH-LF- 70 mm and 90 mm thin slab concasting-continuous rolling process at No1 Steelworks

Maanshan Steel. The chemical composition C≤0. 005%

P0. 050%

Als0.20% and N≤40 x 10

-6

was controlled by using the measures such as controlling LD tapping [C

]

0. 03% 〜0.04%

RH vacuum decarburizing to 0. 002 5% C

adding FeP before RH decarburizing

LF secondary refining desulphurizing and RH-LF adjusting Als ； the produced slab of W600 steel had even analyses and the mechanical properties met the technical requirement.