0.02~0.04Al)的冶炼工艺为110 t EBT电弧炉-LF-VD-Φ500 mm圆坯连铸。通过使用炉料80%铁水+20%废钢
控制(Pb+As+Sn+Sb+Bi)≤150×10
-6
EAF终点[C
]
≥0.08%
终点[P
]
≤0.006%
并在出钢过程加1.0 kg/t Al;以及采用LF精炼合成渣(/%:40~55CaO
20~30Al
2
O
3
≤6MgO
≤4.0SiO
2
≤1.5FeO)
成品硫含量≤0.002%
T[O
]
≤17×10
-6
[N
]
≤32×10
-6
[H
]
≤0.9×10
-6
(Pb+Sn+Sb+As+Bi)≤0.013 7%;连铸圆坯中心疏松、缩孔≤1.5级
轧材各类夹杂物均≤0.5级
满足高压气瓶钢质量要求。
Abstract
The steelmaking process of steel 4147 for high pressure cylinder (/% : 0. 46 ~0. 50C
0.15 〜0. 35Si
0.8-1. OMn
≤0. 015P
≤0. 008S
0. 85 ~ 1. lOCr
0. 15 ~0. 25Mo
0. 02 ~0. 04Al) at Yonggang is 110 t EBT EAF- LF-VD-Φ500 mm round bloom CC. With using charging 80% hot metal + 20% scrap to control (Pb + As + Sn + Sb + Bi) ≤150 x 10
-6
controlling EAF end [C
]
NO. 08% and end [ P
]
≤ O. 006% and adding 1. 0 kg/t Al during tapping; using LF synthetic refining slag (/% : 40 ~55CaO
20 ~ 30Al
2
O
3
≤6MgO
≤4.0SiO
2
≤1.5FeO)
the sulphur content in finished liquid is
<
0.002% with T [O
]
≤17 x 10
-6
[N
]
≤32 x 10
-6
[ H
]
≤ 0. 9 x 10
-6
and (Pb + Sn + Sb + As + Bi) ≤0
013 7% ; the rating of center porosity and shrinkage pipe of casting round bloom is ≤1. 5
and the rating of each inclusion in rolled products is ≤ 0. 5 to meet the requirement of quality for high pressure cylinder.