The alloying element which can replace tungsten in high speed steels is

A Nickel
B Vanadium
C Cobalt
D Molybdenum

Correct Answer: Molybdenum

Molybdenum has effects similar to manganese and vanadium, and is often used in combination with one or the other.
This element is a strong carbide former and is usually present in alloy steels in amounts less than 1%.
It increases hardenability and elevated temperature strength and also improves corrosion resistance as well as increased creep strength.
It is added to stainless steels to increase their resistance to corrosion and is also used in high speed tool steels.
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Related Questions

High speed cutting tool steels contain about __________ percent of tungsten.
A 6-8
B 18-20
C 30-35
D 50-55
For hardening alloy steels and high speed steels, they are heated to
A 1100 to 1300°C
B 1300 to 1500°C
C 500 to 600°C
D 700 to 900°C
__________ can replace tungsten in high speed steel,
A Chromium
B Vanadium
C Cobalt
D Molybdenum
__________ can replace tungsten in high speed steel.
A Chromium
B Vanadium
C Cobalt
D Molybdenum
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?
A Cobalt: It contributes to rerl hardness by hardening ferrite
B Molybdenum: It forms abrasion resisting particles
C Phosphorous: It improves machinability in free cutting steels
D Silicon: It reduces oxidation resistance
Steels with high carbon equivalent have poor weldability, because in these steels during welding
A Carbon and other alloying elements get oxidised from the weld pool
B Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld
What is the type of shielding gas for GTAW (Gas Tungsten Arc Welding) used for carbon steels only called?
A Argon H2
B Argon CO2
C Argon Helium
D Helium
'Killed steels' are those steels
A Which are destroyed by burning
B Which after their destruction are recycled to produce fresh steel
C Which are deoxidized in the ladle with silicon and aluminium
D In which carbon is completely burnt
Ferric stainless steels compared to austenitic stainless steels
A Have lower corrosion resistance
B Are harder to fabricate
C Are less ductile and hence less suitable for cold pressing
D All of the above
Which of the following alloying elements is present in maximum percentage in high speed steel.
A Molybdenum
B Chromium
C Tungsten
D Vanadium

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