VOD process is preferred over AOD process for making extra low carbon stainless steel, because
A. pco can be lowered to a much lower level in the VOD than in the AOD
B. AOD does not have adequate stirring
C. free board needed for such operation is not available in the AOD
D. AOD refractory is not stable in contact with extra low carbon steel
Answer: Option A
This Question Belongs to Metallurgical Engineering >> Steel Making In Metallurgy
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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