Match the following
Group 1 | Group 2 |
P. Aluminium addition | 1. Homogenization |
Q. Argon stirring | 2. Deoxidation |
R. Oxygen injection | 3. Decarbunsation |
S. Calcium carbide injection | 4. Desulfurisation |
A. P-2, Q-1, R-3, S-4
B. P-2, Q-1, R-4, S-3
C. P-4, Q-3, R-2, S-1
D. P-1, Q-2, R-3, S-4
Answer: Option A
Identify the incorrect statement with reference to L.D. steel making
A. The temperature of L.D. furnace is maintained at around 1600°C
B. The basicity of slag is maintained at around unity
C. Dephosphorisation and decarburisation should proceed simultaneously
D. High silicon hot metal may lead to sloping
The oxidising power of a steel making slag is dependent on the concentration of
A. CaO, because Ca2+ ions are oxidising to the elements
B. CaO, because O2- ions are oxidising to the elements
C. FeO, because Fe2+ ions are oxidising to the elements
D. FeO, because O2- ions are oxidising to the elements
Inclusion free steel are known as
A. Plain carbon steel
B. Clean steel
C. Alloy steel
D. None of these
A. a is false but r is true
B. a is true but r is false
C. a is true and r is also true, but r is not the reason for a
D. a is true and r is also true, and r is the reason for a
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