In AOD process of stainless steel making, a mixture of argon and oxygen gas in blown through the bottom because the argon gas
A. dissolve in steel to offer better corrosion protection
B. acts as a catalyst for the reaction of carbon and oxygen
C. lowers the partial pressure of CO gas in the bubble and hence helps to increase the decarburisation rate
D. Prevents the oxidation of expensive nickel in the stainless steel
Answer: Option D
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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