An analysis on the products of 1215 low carbon high Sulphur free-cutting steel (/%: 0. 05 ~ 0. 10C

W 0.013Si

1.06 ~1.33Mn

0. 051 -0.061P

0. 24 ~0. 36S

0.012 0 ~0. 014 0[O]

0.005Al) produced by domestic 100 t EAF-LF-CC

80 t

100 t and 160 t BOF-LF-CC four process production line is carried out. Results show that the control characteristic of domestic 1215 low carbon high Sulphur free-cutting steel is to control Mn/S (3. 7 - 3. 9) of steel by suitable increasing Mn content in steel and for individual flow sheet is by decreasing S content in steel to get Mn/S =4. 4； the inclusion control of inclusion in steel produced by 160 t BOF flow sheet (Mn/S =3. 8

fluctuation of MnS inclusions area and length/width ratio are comparatively smaller) is better than that by others； due to smaller segregation of elements in casting billet and suitable controlling of cooling rate after rolling the steel produced by 80 t BOF flow sheet and 160 t flow sheet has no obvious banded structure

but by 100 t EAF flow sheet and 100 t BOF flow sheet the rating of banded structure is 3 ~4.