In process annealing, the hypo eutectoid steel is

A binary phase diagram of components P and Q displays an eutectoid reaction with terminal solid solutions a on the P rich side and β on the Q rich side. At the eutectoid temperature, the solubilities of Q in a and β are 5 and 90 wt% respectively. The densities of α and β phases are 9.5 and 2.49 gm/cm³ respectively.
At the eutectoid point, the alloy has α and β in the weight ratio 1 : 1. The eutectoid point occurs at composition . . . . . . . . wt % Q.

A

46

B

47.5

C

50

D

52.5

In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

A

In still air

B

Slowly in the furnace

C

Suddenly in a suitable cooling medium

D

Any one of these

In case of full annealing of hypo-eutectoid steels, it is heated to a temperature _____

A

above upper critical temperature

B

above lower critical temperature

C

to a critical temperature

D

recrystallization temperature

Steel with __________ carbon is known as hypo-eutectoid steel.

A

0.8%

B

Below 0.8%

C

Above 0.8%

D

None of these

In transformation in steel, hypo eutectoid steel are heated up to what temperature?

A

677°C

B

700°C

C

723°C

D

746°C

A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

A

Equal to

B

Less than

C

Greater than

D

None of these

In a hardening process, the hypo-eutectoid steel is

A

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

B

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

C

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

D

Heated below or closes to the lower critical temperature and then cooled slowly

A steel contains 38.5 mass % pro-eutectoid ferrite and 61.3 mass % austenite at eutectoid temperature (723°C). The carbon content of steel, in mass %, is

A

0.35

B

0.40

C

0.45

D

0.50

What is the maximum %C by weight in hypo-eutectoid steels?

A

0.5%

B

0.7%

C

0.8%

D

1.2%

Upon annealing, eutectoid steel converts to which of the following?

A

Perlite

B

Cementite

C

Austenite

D

Martensite

In process annealing, the hypo eutectoid steel is

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