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
