Which of the following has a very high carbide forming tendency in steels?

Which of the following has no effect on the carbide forming tendency in steels?

A

Molybdenum

B

Phosphorus

C

Chromium

D

Vanadium

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

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

'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 has the highest gum forming tendency in gosoline?

A

Paraffins

B

Diolefins

C

Aromatics

D

Naphthenes

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

A

1800

B

2200

C

2400

D

2700

silicon carbide refractories have very low

A

[

A. Refractoriness (

B. Thermal conductivity

B

Resistance to thermal shock

C

None of these

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

A

Nickel

B

Vanadium

C

Cobalt

D

Molybdenum

Shock resisting steels should possess high

A

Hardness

B

Toughness

C

Tensile strength

D

Wear resistance

Which of the following has a very high carbide forming tendency in steels?

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