The production process of free-cutting stainless steel 303F (/% : W0. 15C

W1. OSi

W2. 0Mn

0. 15 ~0.35S

≤0.045P

17.00 〜19.00Cr

8.00 〜10.OONi

≤0.6Mo) wire rod is 30 t EBT EAF-AOD-LF-150 mm x 150 mm CC-Φ9.0 mm Wire Rod High-speed Rolling. By AOD reduction slag binary basicity 1.0 ~ 1.4

the yield of sulfur in the iron sulfide reaches more than 70%

and control LF refining ≤ 45 min

the [S] loss can be effectively prevented. With superheat of continuous casting value of 30 ~ 40 °C

secondary water specific water rate 0.28 ~0.32 L/kg

and using specific protective slag to effectively avoid flocculation

and get good billet surface quality

the center porosity of continuous casting billet is less than 2.0 rating

center segregation≤2.0 rating

ingot type segregation ≤2 rating

no blowhole defects. With breakdown at 1230 〜1250 ℃

final rolling at m 1050 °C and water shut-off rolling the rolling product head cracking can be effectively avoided. The results show that the rating of sulfide inclusions with main MnS in steel 303F is 2.5 〜3.0. The tensile strength of the wire rod is 650 〜670 MPa

the grain size is 11 ~ 12 rating

the value of HBW hardness is 180 〜195

and the turning chips are silver gray broken chips.