Properties of alloy steels can be improved significantly by the addition of
A. molybdenum
B. zinc
C. silicon
D. none of these
Select an option to see the answer and solution.
In the initial period of slow decarburization, iron oxide content in the slag may rise
A. 14 - 16%
B. 40 - 60%
C. 4 - 6%
D. 0.4 - 0.6%
Select an option to see the answer and solution.
Match the facilities in a steel plant in
Group 1 with the associated terms listed in
Group 2 .
Group 1
Group 2
P. Electric arc furnace
1. High top pressure
Q. L-D converter
2. Dummy bar
R. Continuous caster
3. Slag splashing
S. Blast furnace
4. Eccentric bottom tapping
A. P-4, Q-1, R-2, S-3
B. P-2, Q-4, R-1, S-3
C. P-4, Q-3, R-2, S-1
D. P-1, Q-3, R-2, S-4
Select an option to see the answer and solution.
Given the following Assertion 'A' and the Reason 'R' ; the correct option is
Assertion A: Phosphorous removal in steel making is favoured by basic slag.
Reason R: Basic slag decreases the activity of P2 O5 in the slag.
A. Both A and R are true and R is the correct reason for A
B. Both A and R are false
C. A is true but R is false
D. Both A and R are true but R is not correct reason for A
Select an option to see the answer and solution.
What is the lining thickness of LD converter
A. 300 - 600 mm.
B. 600 - 1000 mm.
C. 60 - 100 mm.
D. 6 - 10 mm.
Select an option to see the answer and solution.
The grain-oriented silicon steel is also known as
A. Corrosion steel
B. Electrical steel
C. Transformer steel
D. None of these
Select an option to see the answer and solution.
What are the common uses of Duplex (Austenitic-Ferritic) stainless steels
A. in marine and off-shore oil applications
B. to handle chloride brine solutions
C. in the chemical and petrochemical industries
D. All are correct
Select an option to see the answer and solution.
Cooling of semi solidified product just below the mould is called
A. Secondary cooling
B. Primary cooling
C. Tertiary cooling
D. None of these
Select an option to see the answer and solution.
The usual energy consumption in electric are furnace steel making is . . . . . . . . k Wh/ton of steel.
A. 60 - 100
B. 400 - 700
C. 1200 - 1500
D. 2000 - 2300
Select an option to see the answer and solution.
Hardening due to phase transformation can be realized in
A. High Mn (>18%) steel
B. Martensitic stainless steel
C. Austenitic stainless steel
D. Both B and C
Select an option to see the answer and solution.
Scrap in a LD converter is used as an . . . . . . . . agent
A. early slag formation
B. cooling
C. slag viscosity reducing
D. Phosphorous removal
Select an option to see the answer and solution.
The slag over the steel bath in ladle worked as
A. insulator
B. slag eye
C. conductor
D. none of these
Select an option to see the answer and solution.
The austenitic precipitation hardening stainless steels are . . . . . . . . in nature.
A. Magnetic
B. Non magnetic
C. Both A and B
D. None of these
Select an option to see the answer and solution.
Which is the primary element used for making stainless steel alloy?
A. Chromium
B. Zirconium
C. Vanadium
D. Indium
Select an option to see the answer and solution.
Austenitic Stainless Steel Cr-Manganese-Nitrogen Grades generally designated by
A. 4XX Series
B. 3XX Series
C. 2XX Series
D. 2XXX series
Select an option to see the answer and solution.
Hydrogen in liquid steels is dissolved
A. as tiny gas bubbles
B. in the atomic form
C. in the ionic form
D. in the molecular form
Select an option to see the answer and solution.