A New Method for Plasticization of Inclusions in Saw-Wire Steel by NaF Addition
Abstract
:1. Introduction
2. Experimental Aspects
2.1. Material Preparation
2.2. Experimental Equipment
2.3. Experimental Procedure
2.4. Analysis
3. Results and Discussion
3.1. Effects of NaF Addition
3.2. Mechanism of Inclusion Modification
3.3. Evolution of Inclusions
4. Conclusions
- (1)
- The Na-containing inclusions were generally larger than the MnO-SiO2 inclusions and were therefore more likely to be removed by flotation. Thus, NaF addition promoted inclusion removal and improved cleanliness of the steel by modifying MnO-SiO2 inclusions into Na-containing inclusions;
- (2)
- With the increase of NaF addition, the proportion of Na-containing inclusions with low melting point increased and the proportion of plastic inclusions showed a relevant increasing tendency.
- (3)
- The modification mechanism of inclusions by NaF is generalized as two steps:
- Step 1:
- Silicon in the molten steel reacts with NaF droplets through Reaction [Si] + 4NaF (l) = SiF4 (g) + 4[Na] to generate [Na] in steel.
- Step 2:
- The generated [Na] then transfered into inclusions by reducing the MnO or SiO2 in inclusions through Reaction 2[Na] + (MnO)inc = [Mn] + (Na2O)inc and 4[Na] + (SiO2)inc = [Si] + 2(Na2O)inc, thus modifying the inclusions.
Author Contributions
Funding
Conflicts of Interest
References
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Heats No. | NaF Amount/g | Fe Amount/g |
---|---|---|
A | 0.5 | 0.5 |
B | 1 | 1 |
C | 2 | 2 |
D | 1.5 | 1.5 |
[C] | [Si] | [Mn] | [Al] | [Ca] | [Mg] | [Na] | T.O. |
---|---|---|---|---|---|---|---|
0.87 | 0.17 | 0.52 | 0.007 | <0.0003 | 0.0002 | <0.005 | 0.001 |
Heats No. | [C] | [Si] | [Mn] | [Na] |
---|---|---|---|---|
A | 0.86 | 0.15 | 0.50 | <0.005 |
B | 0.84 | 0.14 | 0.51 | <0.005 |
C | 0.82 | 0.12 | 0.51 | <0.005 |
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Chen, L.; Wan, Y.; Li, J.; Chen, W.; Yang, Y.; McLean, A. A New Method for Plasticization of Inclusions in Saw-Wire Steel by NaF Addition. Metals 2020, 10, 704. https://doi.org/10.3390/met10060704
Chen L, Wan Y, Li J, Chen W, Yang Y, McLean A. A New Method for Plasticization of Inclusions in Saw-Wire Steel by NaF Addition. Metals. 2020; 10(6):704. https://doi.org/10.3390/met10060704
Chicago/Turabian StyleChen, Liangjun, Yong Wan, Jie Li, Weiqing Chen, Yindong Yang, and Alexander McLean. 2020. "A New Method for Plasticization of Inclusions in Saw-Wire Steel by NaF Addition" Metals 10, no. 6: 704. https://doi.org/10.3390/met10060704