李强, 王新华, 黄福祥, et al. Behavior and Control of Nonmetallic Inclusions in X80 Pipeline Steel during LF-RH Secondary Refining Process[J]. Special Steel, 2011, 32(4): 26-30.
李强, 王新华, 黄福祥, et al. Behavior and Control of Nonmetallic Inclusions in X80 Pipeline Steel during LF-RH Secondary Refining Process[J]. Special Steel, 2011, 32(4): 26-30.DOI:
The change of nonmetallic inclusions in X80 pipeline steel (%: 0. 041 〜0. 044C
0. 15Si
1. 78 -1. 80Mn
0. 007 ~ 0. 010P
0. 000 8 ~ 0. 001 2S
0. 039 ~ 0. 047 F Al
]
s) produced by 210 t BOF-LF-RH-slab CC flow sheet during refining process has been studied. With adding Al during BOF tapping for intensifying deoxidation (0. 01 % 〜 0. 02% [ Al
]
s) and using high basicity and reducibility refining slag (ingredient /%: 50 〜58CaO
7 ~ l0MgO
20 ~ 25Al
2
O
3
4 - 7SiO
2
0. 5 - 1.4TFe) in LF refining process to activate the slag-metal reaction
the Al
2
O
3
inclusions in steel are quickly transformed to liquid calcium aluminates and part
-liquid CaO-MgO-Al
2
O
3
complex compound inclusions. The cleanliness of steel liquid is improved by liquid and part-liquid inclusions colliding with one other
agglomerating
coarsening and floating removing. Before casting the T [O
]
decreases to (7 〜10) x 10
-6
the size range of inclusions in steel is 3 ~ 5
μm
and the large-scale low melting point calcium aluminate stringer inclusion doesn