洁净低碳铝镇静钢(%:0.05~0.06C、0.04Al)由210 t顶底复吹转炉-CAS精炼-连铸230 mm板坯流 程冶炼。通过27~28 min CAS密封吹氩处理,钢液T[0
]
由CAS前(50~60)×10~‘降至(19~24)×10
-6
中间包 钢水T[0
]
降至(17~20)×10
-6
铸坯总氧含量为(11~15)×10
-6
。铸坯中主要为≤3 μm的球状、块状Al
O
和 Al
2
0
3
-MnS复合夹杂。≥50 μm的大型夹杂物最高含量为5.18 mg/10kg
Abstract
The cleanliness low carbon aluminum killed steel(0.05~0.06C
0.04Al)was melted by 210 t top and bottom combined blown converter - CAS(composition adjustment by sealed argon bubbling)refining - concasting 230 mm slab flow sheet. With sealed argon bubbling treatment for 27~28 min
the total [0
]
of liquid steel decreased to(19~ 24)×10
-6
from(50~60)×10
-6
before CAS treatment
the total [0
]
of steel in tundish decreased to(17~20)×10
-6
and the total oxygen content in cast slab was(11~15)×10
-6
.The main inclusions in cast slab were ≤3 μm spherical and block shaped Al
2
O
3
and combined Al
2
O
3
-MnS inclusions
and the maximum content of ≥50 um large inclusions in slab was 5.18