31. What are the properties of synthetic slag
32. Stainless steel is most commonly produced using the . . . . . . . . process.
33. During LD blow in steel making the impurity that gets removed first is
34. A steel sample which has been deoxidised with Fe - Mn at 1600°C contains 0.51 wt%Mn. The equilibrium constant for dissolution of MnO in steel with 1 wt% standard state is 0.051. the residual oxygen level in the sample is . . . . . . . . wt%
35. Zinc in steel
36. What is the refining period for LD convertor?
37. In steel making, the addition of bauxite is done to
38. In a good rimming steel
39. Stainless steel used for making sharp edge components (like knife, surgical items etc.) is
40. Ladle deoxidation of liquid steel is done at 1600°C by adding ferro-aluminium. By assuming Stokes law behaviour, time (in s) required for alumina particles of 50 μm diameter to float to the surface from a depth of 2 m would be
[Given: density of steel = 7000 kg/m3, density of alumina = 3650 kg/m3, viscosity of steel = 6 × 10-3 kg/m/s]
[Given: density of steel = 7000 kg/m3, density of alumina = 3650 kg/m3, viscosity of steel = 6 × 10-3 kg/m/s]