综述：中间包钢液二次氧化对钢中非金属夹杂物的影响

段生朝, 刘珍童, 康君, 白乘风, 文健, 刘刚, 张立峰

Review: Effect of Reoxidation on the Non-Metallic Inclusion in Molten Steels in Tundish

DUAN Shengchao, LIU Zhentong, KANG Jun, BAI Chengfeng, WEN Jian, LIU Gang, ZHANG Lifeng

表1 中间包覆盖剂造成钢液二次氧化的研究总结^{[8,20,21,24~29,31~34]}

Table 1 Summaries of previous studies on the reoxidation of molten steel by tundish flux^{[8,20,21,24-29,31-34]}

Tundish cover powder	Steel composition	Experimental method	Ref.
(39.5-62.5)CaO-(2.7-22.2)Al₂O₃-(2.6-47.4)SiO₂	Ultra-low carbon steel	The industrial trials were carried out at the No.5 continu-ous caster at Mizushima Works in Kawasaki Steel Corp-oration	[27]
52CaO-35Al₂O₃-13SiO₂ 50CaO-50SiO₂-100SiO₂	Al-killed steel	Reoxidation of Al-killed steel by slag and air was investigated in laboratory experiments and industrial trials in 85 t tundish at Sumitomo Metal Industries	[31]
*	Non-killed and Al-killed steels	The industrial trials were conducted in 60 t tundish at Nippon Steel Corporation	[26]
RHA + (46-50)CaO-(42-45)Al₂O₃-3SiO₂-2Fe₂O₃- (1.8-2.5)TiO₂	Ti-bearing Al-killed ultra-low carbon steel	The industrial trials were conducted at Tata Steel	[20]
26.8CaO-42.3Al₂O₃- 27.6SiO₂	Ti-stabilized ultra-low carbon steel	45 g steel covered with 40 g tundish slag was held in an alumina crucible at 1823 K	[24]
RHA + 45CaO-35Al₂O₃- 10SiO₂-5MgO-5CaF₂	Al-killed Fe-C-Si steel	500 g of steel and 50 g of slag were placed in a MgO crucible and heated to 1823 K (R = 0.14, 0.26, 0.38, and 1.0)	[8]
RHA + 55CaO-35Al₂O₃- 4SiO₂-4MgO	Al-killed Fe-C-Si steel	500 g of steel and 50 g of slag were placed in a MgO crucible and heated to 1823 K (RCA = 0.5, 0.75, 0.83, 0.87, and 0.90)	[28]
50CaO-30Al₂O₃-10SiO₂- 10MgO-(5, 10)Cr₂O₃	Al-killed YT01 steel	The Al-killed steel was held in a MgO crucible at 1923 K for 30 min and then 20 g of slag with various Cr₂O₃ contents was added	[29]
73CaO-25SiO₂-(1-15)FeO-1MnO	Ultra-low carbon steel	The slag-metal reactions between 30 g pre-melted slag and 100 g of sample were conducted in a zirconia crucible at 1853 K	[25]
44.2CaO-44.1Al₂O₃- 6.0SiO₂-2.68MgO-1.17TiO₂	Ti-bearing Al-killed ultra-low carbon steel	400 kg of the basic tundish flux was added to the surface of the molten steel in the 70 t tundish, and then 60-80 kg of rice hull ball was added to the tundish flux	[21]
RHA + 45.65CaO-22.88Al₂O₃-20.75MgO-2.84SiO₂	Si-Mn killed SAE 1055 steel	150 g steel and 20 g tundish slag (5 g RHA) were acco-mmodated in an Al₂O₃ crucible at 1853 K	[32]
53.5CaO-41.5Al₂O₃-5MgO and 47.5CaO-47.5SiO₂-5MgO	Si-killed 304 stainless steel	600 g of 304 stainless steel and 50 g of slag were cont-ained in a MgO crucible at 1773 K	[33]
RHA, RHA + 51.1CaO- 43.3SiO₂, and RHA + 52.6CaO-40.7Al₂O₃	Si-killed 316L stainless steel	600 g of 316L stainless steel was placed in a MgO crucible at 1773 K and then 45 g of tundish flux was quickly added to the surface of the molten steel	[34]