The correct sequence of elements of 18-4-1 HSS tool is
Composition of high speed steel is
C = 0.67%
W = 18%
Cr = 4%
V = 1%
It is also called 18-4-1 steel.
Which is closest to the purest form of iron
Wrought iron contains as much as 99.9% of iron. Since it contains very little amount of Carbon, it is very pure iron.
Cupola is used to make
Cupola furnace is used to produce cast iron from the Pig Iron.
Which among the following has poorest weldability
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.
Balls for ball bearings are made of
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.
Steel widely used for making precision measuring instruments is
Which of the following is correct statement regarding free cutting steel?
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.
Alloy steel which is work hard enable and which is used to make the blade of bull dozers, bucket wheel excavators and other earth moving equipment contain Iron, Carbon and
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.
Machinability of steel is improved by adding
Alloy containing Tin is
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.
Babbitts are used for
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.
A steel containing 36% Nickel is called
Invar consists of 36% Nickel, 64% Iron
Cast iron is used for machine beds because of its high
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.
Addition of magnesium to cast iron increases its
Tin base white metal are used where the bearing are subjected to
Tin base white metal posses good corrosion and wear resistance.
Shock resistance property of steel is increased by adding
Nickel improves tensile strength, raises elastic limit, imparts hardness, toughness and increases corrosion resistance.
Chromium increases strength, hardness and corrosion resistance.
Puddling is the process employed for converting
Wrought iron is formed from the Pig Iron by puddling process.
Casting ability of aluminium increases when
Globular form of cementite in the structure of steel is obtained through
Constantan is one metallic alloy used for making thermocouple wires, its constituents are
Addition of vanadium to steel results in improvement of
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.
Alloying element which can replace tungsten in high speed steels is
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.
Composition of Monei metal is
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.
The percentage of carbon in grey cast iron is in the range of
German silver contains
Cold working of steel is defined as working
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.
Which one of the following is the binding material in cemented carbide tool
Cemented carbide tool is made on the base of cobalt and cobalt act as binding material.
Coefficient of expansion is practically nil in a particular alloy. What is this alloy?
Presence of sulphur makes steel brittle. The effect can be reduced by adding