张宇斌, 文光华, 于雄, et al. A Study on Mold Powder for High Aluminium Austenite Non-Magnetic Steel 20Mn23Al2V Slab Casting[J]. Special Steel, 2013, 34(6): 22-25.
张宇斌, 文光华, 于雄, et al. A Study on Mold Powder for High Aluminium Austenite Non-Magnetic Steel 20Mn23Al2V Slab Casting[J]. Special Steel, 2013, 34(6): 22-25.DOI:
The Al in non-magnetic steel 20Mn23Al2V (/% : 0. 14 ~ 0. 20C
≤0. 50Si
21. 5 ~ 25. 0Mn
1. 50 ~ 2. 50Al
0. 04 ~0. 10V)- [Al
]
easily reacts with SiO2 in mold powder- (SiO
2
) led to modification of mold powder and the liquidus temperature of non-magnetic steel is lower because of higher alloy elements content
therefore the mold powder with low basicity
low A12O3 content and low melting temperature is required. Three kinds of mold powder (/% : 20. 2 ~ 24.4CaO
35. 3 ~40.0SiO
2
2. 2 ~ 4. 1 Al
2
O
3
3. 0 ~5. 0B
2
O
3
) with low basicity (0. 55 ~0. 61) and low melting temperature (904 ~ 1 015
℃
) have been designed. The test results by 200 mm x 1 260 mm slab casting with 25 t tundish show that the mold powder for non-magnetic steel 20Mn23Al2V with 5.0% B
2
O
3
basicity 0.50 ~0. 60
melting temperature 1 010 °C and viscosity 0. 215 Pa·s and in casting speed 0. 60 ~ 0. 65 in/min is optimum to satisfy the requirement of casting process.