关键词: 帘线钢XLX72A, 转炉-1^#LF-2^#LF-VD-CC流程, Al含量, 夹杂物, 工艺实践

Abstract: The tire cord steel XLX72A (% ： 0. 69 〜0.73C, 0. 20 〜0.28Si, 0. 47 〜0.55Mn, ≤0.015P, ≤ 0. 015S, ≤0. 05Ni, ≤0. 08Cr, ≤0. 05Cu, ≤0. 005Al) has been developed by using the operation measures including converter end controlling -% : ≥ 0.12C, ≤0. 008P, ≤0. 010S- LF Nol basic slag refining for ≥40 min- LF No2 acid slag (R=0. 8 -0. 9) refining for 30 min- 67 Pa VD refining for ≥ 10 min and soft argon blowing for ≥15 min- shielding casting (liquid overheating ≤30 ℃ ) with mold and end electromagnetic stirring. Results show that the Cu and Al content in sled are respectively 0. 02% ~0. 03% and 0. 002% 〜0. 003% , the tensile strength Rm of Φ5. 5 mm product is 1 050 〜1 090 MPa and its reduction of area Z is 43. 5% -48. 0% , the ratings of macrostructure and micro inclusions in steel meet the requirement of standard, and its service performance is better.