韩秀丽, 张玓, 刘磊, et al. Effect of Mineral Constitution of Casting Mold Powder Flux Films on Metallurgical Quality of Different Steels Slab[J]. Special Steel, 2016, 37(1): 64-67.
韩秀丽, 张玓, 刘磊, et al. Effect of Mineral Constitution of Casting Mold Powder Flux Films on Metallurgical Quality of Different Steels Slab[J]. Special Steel, 2016, 37(1): 64-67.DOI:
crystallizing ratio of phase and microstructure of mold flux films for casting ultralow carbon steel SPHC (0. 020% 〜0.055% C
70mm slab
mold powder /% : 33. 14SiO
2
3. 86Al
2
O
3
3. 88MgO
31. 52CaO
8. 27K
2
O + Na
2
O
7. 55F
-1
3. 93C)
peritectic steel SS400 (0. 18% ~0. 22% C
70mm slab
mold powder /% : 29. 62SiO
2
4. 63Al
2
O
3
2. 05MgO
35
86CaO
10.43K2O + Na
2
O
7.55F
-1
3. 93C) and Ti microalloying steel Q345B (0. 15% ~0. 19%C
0. 04% ~0. 05%Ti
260 mm slab
mold powder /% : 31. 10Si02
5. 21Al
2
O
3
5. 07MgO
35
46CaO
6. 22K
2
O + Na
2
0
6. 96F
-1
6.96C) at Handan Steel have been systematically analyzed and compared by polarizing microscope. Results show that the alternative structure of “ crystallizing layer-amorphous layer” all occurs in three kinds of flux films from slab side to mold side. In SPHC steel flux film there is 90% ~95% amorphous phase
only minor cuspidine occurs in crystallizing phase
low crystallizing ratio is favourable to lubricate casting slab; in SS400 steel flux film the crystallizing ratio is about 55% - 60%
more cuspidine with partial melilite precipitates that is available to control slab heat transfer; the crystallizing ratio in Ti micro-alloy steel Q345B flux film is little higher than that in SS400 flux film
the precipitated melilite
cuspidine and wollastonite that meet the requirement of lubrication and heat transfer control