The process flow sheet for pilot commercial production of free cutting steel SY12SnS (/% : 0.08-0.16C
≤0.15Si
1.00-l.30Mn
0.03-0.07P
0.15-0.25S
0.12-0.18Sn) is 100 t DC EAF-LF-195 mm x 195 mm CC- CR (finished product-Φ8 mm). Results show that total amount of large scale inclusions in casting billet of free cutting steel SY12SnS is 4.72 mg/10 kg
HB hardness value o£ rolled products is 134-141
and the tensile strength
elongation and reduction of area of steel are respectively 490-503 MPa