Rk3

At which percentage of carbon content does steel develop maximum for tensile strength

0.8 %

In low alloy steels the total of all Alloying elements is less then

5%

Steel sheet

AISI

Boilers and pressure vessels

ASME

Elasticity

Ability of material to return to its original dimension after being stretched

Ductility

Ability of metal to be drawn stretched twisted or permanently deformed without breaking

Fatigue strength is the

Ability of metal to withstand rapidly alternating loads

In a magnet test which of the following metals does not respond to the magnet

Aluminum

Which has the fastest speed of melting

Aluminum

Which metal when machined becomes almost white in colour and when fractured is white in the fractured area

Aluminum

Which of the following is a nonferrous metal

Aluminum

Which of the following metals has the lowest melting temperature

Aluminum

Elongation

Amount of stretching a metal can withstand

Most alloy and tool steels are produced in

An electric furnace

Which steel production method accounts for most of the worlds steel production

Basic oxygen furnace

What is the major advantage of a basic oxygen furnace over the open hearth furnace

Basic oxygen furnace is much faster

Bars rods tubing and wire products are generally made from

Billets

Which of the following is often the feature of hot rolled steel

Black mill scale

Pig iron is produced in

Blast furnace

Structural shapes are made from

Blooms

Identify the three major semi finished forms from which most steel products are fabricated

Blooms, billets, slabs

Which method is generally used for fabricating the standard pipe used in plumbing

Butt welded process

What is one way to tell the difference between low and high carbon steel

By the difference in spark characteristic

Which organization issues specifications in both the SI metric and imperial systems of measurement

CSA

Structural steel shapes and plate

CSA, ASTM

Spark test is mainly used to determine the

Carbon content in steels

Pig iron scrap iron and scrap steel are melted into a Cupola furnace to make

Cast iron

Low carbon mild steel is typically used for

Chisels

Most sheet products are finished by

Cold rolling

When broken great cast iron may be identified by

Dark gray graphite flakes in the grain structure

When broken, nodular iron is identifiable by

Dark spheroid masses in the grain structure

Wire is manufactured by

Drawing rods through a series of dies

Nickel when added to steel increases the steels

Ductility

Tool steels high speed steels and other specialties steels are usually produced

Electric furnace

When performing spark test you should wear

Face shield

The ability of metal to resist fracture when stresses are variable and cyclical nature is known as

Fatigue strength

Describe the affect forging has on the properties of steel

Forging "kneads" the steel into a denser structure which greatly adds to its mechanical properties it is widely used for parts that will be subjected to high stresses

In the blast furnace the impurities removed from the iron

Form a layer of slag on top of the iron

As the carbon content increases the steel becomes more resistant to

Forming and working

One advantage that cold rolling has over hot Rolling is

Greater dimensional control

Which of the following metals is the softest

Ground and polished steel bar

Which of the carbon steel's is the hardest

High carbon steel

Major advantages of the high-strength low alloy steel's over the plain carbon steel

Higher strength to weight ratio while still retaining good weldability at formability

Structural shapes and bars are produced by

Hot rolling

Open die forging is characterized by the use of ____________ to shape the metal

Hydraulic presses

Forging and rolling serve to shape the metal and to

Improve mechanical properties

One of the main effects of carbon content in steel is

Improve tensile strength

Chromium is used as an alloying element in steel

Increase resistance to corrosion and abrasion

When the continuous casting process is used, which stage in steel production is eliminated

Ingot

Which class of ingot has the highest purity

Killed

Which type of steel is the purest and most refined

Killed steel

Although aluminum is similar in appearance to steel it is distinguishable by it's

Light weight

Which of the following is used as a flexing agent to remove the impurities from iron

Lime stone

Files can be used to establish the approximate hardness of a piece of steel. Which of the following medals is the easiest to file

Low carbon steel

Which group of steels has excellent weldability

Low carbon steel

Which of the carbon steels is most weldable

Low carbon steel

Which element is added to gray cast iron to produce nodular or ductile cast iron

Magnesium

Which metal is the lightest

Magnesium

Which of the following is subjected to a long annealing process

Malleable cast iron

Which type of cast iron has undergone a long annealing process

Malleable cast iron

Basic Alloying element that can be used to deoxidize the steel and in greater quantities to improve the steels hardenability, strength, toughness and ductility

Mangnese

Which type of cast iron has magnesium added

Nodular iron

Seamless tubing is manufactured

Piercing rounds with a mandrel

The product produced in the first stage of steel production is

Pig iron

in SAE or AISI systems the specification 1020 indicates

Plain carbon steel

Yield strength

Point at which a metal will continue to stretch even though there is no increase in load

For welding medium and high carbon steel's special electrodes and _________ are usually required

Pre-and post heat treatments

Centrifugal casting is typified by

Rapid rotation of the mould

Thermal conductivity is the

Rate at which heat flows through a metal

Disadvantage of hot rolling is

Residue of mill scale left on the steels surface

Hardness refers to a metal's ability to

Resist indentation or penetration

If metal has good impact strength it will

Resist loads that are applied suddenly and at high velocity

The hardness of a metal is its

Resistance to penetration

Which class of ingot is characterized by an outer skin and by blowholes

Rimmed

Steel bar

SAE, AISI

The element that combines with the carbon in great cast iron to form graphite is

Silicon

Which element combines with the carbon in grey cast iron to form graphite

Silicon

When malleable iron is fractured it shows

Silver coloured skin around the fractured surface

Sheet plate and strip steel are generally made from

Slabs

In a chip test, cast iron chips appear

Small and hard

Identify the requirements for welding most alloy steel's

Special electrodes And preheat and post heat treatments

Closed die forging is typified by the use of __________ to shape the metal

Steam Hammers

Which is magnetic

Straight chromium stainless steel's

In a spark test, the carrier lines for low carbon steel appear

Straight yellowish in colour with very little branching and a few carbon burst

Low carbon steel is typically used for

Structural shapes

Main advantage of the open hearth furnace for steel production

Suitable for producing most grades are steel

Which of the following is a primary use for the high carbon steel's

Tools

Welding high carbon steel without preheating would result in

Weld cracking

Which type of cast iron has the greatest hardness and wear resistant

White cast

Ex of ferrous metals

Wrought iron Cast iron Carbon and low alloy steel Alloy steel Stainless steel

During a tensile test the point at which a metal continues to stretch with no further increase in load is called

Yield point

Galvanize products have been coated with

Zinc

Galvanized products or products that have been coated with

Zinc

Corrosion resistance

a product's resistance to deterioration by a chemical or electrochemical reaction resulting from exposure to moisture, chemicals, or other elements

Strain

deformation of materials in response to stress

Ferrous metals

metals containing iron

Malleability

the ability of a substance to be hammered or beaten or bent without breaking

Thermal expansion

the expansion of matter when it is heated

Compressive strength

the resistance of a material to breaking under compression.

Tensile strength

the resistance of a material to breaking under tension