Test: Engineering Alloys & Its Common Applications - 3 - Mechanical Engineering MCQ

Composition of high speed steel is
C = 0.67%
W = 18%
Cr = 4%
V = 1%
It is also called 18-4-1 steel.

Wrought iron contains as much as 99.9% of iron. Since it contains very little amount of Carbon, it is very pure iron.

Cupola furnace is used to produce cast iron from the Pig Iron.

As the amount of carbon increases, its weldability increases since from the material given, high carbon steel has maximum amount of carbon, it will posses poorest weldability.

Carbon chrome steel contains
C = 0.36%, Cr = 15%
this composition of steel is known as Carbon Chrome Steel and useful in manufacturing of springs, ball and roller bearings.

Free cutting steels also called free machining steel. The free cutting steel have higher amount of Sulphur as compared to other Steel and used where rapid machining and high quality surface finish is primary requirement.

When manganese in steel is more than 12%. It is called hadfield steel and used to make the blade of bull dozers and other earth moving equipment.

Gun Metal: It is an alloy of Copper, Tin and Zinc.
Phosphorous Bronze: It is most important alloy of Copper and Tin,
White Metal: It is also called Babbitt. They are of two types lead base and Tin base depending upon the major alloying element.

Babbitt is most popular bearing material. Babbitts have excellent conformability and embeddability, Tin base Babbitt have better corrosion resistance and can be easily bonded to steel shells.

Invar consists of 36% Nickel, 64% Iron

Since cast iron have the ability to damp small vibration, it is widely used in machine beds and in other equipment where small vibrations appear.

Tin base white metal posses good corrosion and wear resistance.

Nickel improves tensile strength, raises elastic limit, imparts hardness, toughness and increases corrosion resistance.
Chromium increases strength, hardness and corrosion resistance.

Wrought iron is formed from the Pig Iron by puddling process.

Vanadium is added in Sow and medium carbon steels in order to increase their yield and tensile strength properties. In combination with chromium. It produces a marked effect on the properties of steel and makes the steel extremely tough and strong, these steels are largely used for making spring steel,.high speed tool steels, crankshaft etc.

Molybdenum and tungsten both raises the critical temperature of steel and hence it is used in increasing the strength of the alloyed steels at high temperature.

Monel metal consists of 68% Ni, 29% Cu, 3% other constituents.
It is superior to brass and bronze in corrosion resisting properties.

During the casting of steel, since it undergoes a number of phase transformation, it has a tendency to capture oxygen from the surroundings. This oxygen can be removed by adding silicon in the material. When removal of oxygen is total. It is called killed steel.

Cold workin g is carried out below the recrystallization temperature and hot working is carried out above the recrystallization temperature but below melting or burning point.

Cemented carbide tool is made on the base of cobalt and cobalt act as binding material.