Tungsten in high speed steel is responsible for its

The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.

A

Equal to

B

Less than

C

More than

D

None of these

__________ can replace tungsten in high speed steel,

A

Chromium

B

Vanadium

C

Cobalt

D

Molybdenum

Tungsten in high speed steel provides

A

Hot hardness

B

Toughness

C

Wear resistance

D

Sharp cutting edge

__________ can replace tungsten in high speed steel.

A

Chromium

B

Vanadium

C

Cobalt

D

Molybdenum

High speed steel drills can be operated at about _________ the speed of high carbon steel drills.

A

One-half

B

One-fourth

C

Double

D

Four times

For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is

A

5 m/min

B

10 m/ min

C

15 m/min

D

30 m/min

The average cutting speed for turning mild steel with a high speed steel tool is

A

15 to 19 m/min

B

25 to 31 m/min

C

60 to 90 m/min

D

90 to 120 m/min

High speed cutting tool steels contain about __________ percent of tungsten.

A

6-8

B

18-20

C

30-35

D

50-55

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

A

Nickel

B

Vanadium

C

Cobalt

D

Molybdenum

Tungsten in steel

A

Improves wear resistance, cutting ability and toughness

B

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

C

Improves cutting ability and reduces hardenability

D

Gives ductility, toughness, tensile strength and anti-corrosion properties

Tungsten in high speed steel is responsible for its

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