|
|
|
| Characteristic Analysis of Solidified Crust for Basic Tundish Flux With Al��Killed Steel Casting |
| WANG De��yong, ZHANG Zhi��xiang, WANG Hui��hua, JIANG Mao��fa |
|
|
|
|
Abstract This present paper focused on the formation reasons of solidified crust when a basic tundish flux was used to cast the Al-killed steel. Crust samples were taken in an actual tundish, and analyzed by the methods of XRD, SEM and EDX. It was found that the main compositions of crystallization phases existing in tundish crust are Ca12Al4O33, Ca2SiO4 and a little spinel. Spinel and Ca2SiO4 distributed at grain boundaries of Ca12Al4O33, which increased the connection strength of crystallization phases by pinning the grain boundary, density or hardness of tundish crust will also significantly increased. When an initial composition of tundish flux was in spinel region of CaO-SiO2-Al2O3-10%MgO phase diagram, it was easier to form spinel in crust. Three approaches for spinel formation in crust were summarized. When flux is nearly saturated with magnesia, on the metal/flux interface, MgO in flux reduced by dissolved Al and formed the spinel. Inside molten steel and on the interface of steel/refractory, with a feasible Al content it is also easy to form spinel and spinel inclusions will float and captured by flux.
|
|
Received: 28 December 2009
|
|
Corresponding Authors:
WANG De-yong
|
|
|
|
| [1] |
Long-hu Cao,Cheng-jun Liu*,Qing Zhao,Mao-fa Jiang. Effect of Al2O3 modification on enrichment and stabilization of chromium in stainless steel slag[J]. Chinese Journal of Iron and Steel, 2017, 24(3): 258-265. |
| [2] |
Yin-tao GUO, Qian WANG, Gu-jun CHEN, Sheng-ping HE. Castability of Aluminum- and Sulfur-bearing Free-cutting Steel[J]. Chinese Journal of Iron and Steel, 2015, 22(Supplement 1): 87-92. |
| [3] |
JIANG Zhou-hua,ZHUANG Ying,LI Yang,LI Shuang-jiang. Effect of Modification Treatment on Inclusions in 430 Stainless Steel by Mg-Al Alloys[J]. Chinese Journal of Iron and Steel, 2013, 20(5): 6-10. |
| [4] |
LI Dong-sheng,DAI Qi-xun,CHENG Xiao-nong,WANG Rong-rong,HUANG Yan. High-Temperature Oxidation Resistance of Austenitic Stainless Steel Cr18Ni11Cu3Al3MnNb[J]. Chinese Journal of Iron and Steel, 2012, 19(5): 74-78. |
| [5] |
YANG Shu-Feng LI Jing-feng;ZHANG Li-feng;et al. Behavior of MgO.Al2O3 Based Inclusions in Alloy Steel During Refining Process[J]. Chinese Journal of Iron and Steel, 2010, 17(7): 1-1. |
|
|
|
|
2011, Vol. 18 
