EMAE 160 FINAL QUESTIONS -
LECTURE 6 (METALS AND HEAT
TREATING) EXAM Q&A
What is tempering? - ANSWER-heating to a high temperature (less than the melting
temp) then cooling, to increase hardness and reduce brittleness
Why a controlled atmosphere box furnace for heat treating? - ANSWER-to control
carbon content
Electric arc vs. BOF/oxygen converter (for making steel) ? Select scrap. - ANSWER-
Electric arc: main input is scrap steel, make small amounts of specialty and alloy
steels, almost no pollution
BOF: main input is molten pig iron, make large amounts of standard steel, emits
pollution
List the 4 basic ingredients to make steel in a B.O.F. (basic oxygen furnace) -
ANSWER-pig iron, steel scrap, limestone, oxygen
Explain the designation: 1018CRS. - ANSWER-It is a steel grade. It means 1018
cold rolled steel
How is/was wrought iron made? - ANSWER-made out of iron ore, wood charcoal,
clam shells,
smelted together in a bloomer that is heated and carbon monoxide from charcoal
reduces ore to iron
Three types of Cast Iron? - ANSWER-1. gray (most common)
2. ductile (nodular)
3. white (malleable)
Ferrous vs. Non-Ferrous - ANSWER-ferrous: has iron, easier to recycle, magnetic,
high tensile strength
nonferrous: does not have iron, non magnetic, higher conductivity, more resistant to
corrosion
Is it possible to heat treat/harden through low-carbon steels? Why or why not? -
ANSWER-No, only high carbon steels can be treated conventionally, heat treatment
done to low carbon steel only allows hardening at the heated surface where the high
carbon content is
The strength and hardness of steel increase as carbon content increases. (True or
False) - ANSWER-True
3. List three products produced on a rolling mill. - ANSWER-1. sheet
2. plate
LECTURE 6 (METALS AND HEAT
TREATING) EXAM Q&A
What is tempering? - ANSWER-heating to a high temperature (less than the melting
temp) then cooling, to increase hardness and reduce brittleness
Why a controlled atmosphere box furnace for heat treating? - ANSWER-to control
carbon content
Electric arc vs. BOF/oxygen converter (for making steel) ? Select scrap. - ANSWER-
Electric arc: main input is scrap steel, make small amounts of specialty and alloy
steels, almost no pollution
BOF: main input is molten pig iron, make large amounts of standard steel, emits
pollution
List the 4 basic ingredients to make steel in a B.O.F. (basic oxygen furnace) -
ANSWER-pig iron, steel scrap, limestone, oxygen
Explain the designation: 1018CRS. - ANSWER-It is a steel grade. It means 1018
cold rolled steel
How is/was wrought iron made? - ANSWER-made out of iron ore, wood charcoal,
clam shells,
smelted together in a bloomer that is heated and carbon monoxide from charcoal
reduces ore to iron
Three types of Cast Iron? - ANSWER-1. gray (most common)
2. ductile (nodular)
3. white (malleable)
Ferrous vs. Non-Ferrous - ANSWER-ferrous: has iron, easier to recycle, magnetic,
high tensile strength
nonferrous: does not have iron, non magnetic, higher conductivity, more resistant to
corrosion
Is it possible to heat treat/harden through low-carbon steels? Why or why not? -
ANSWER-No, only high carbon steels can be treated conventionally, heat treatment
done to low carbon steel only allows hardening at the heated surface where the high
carbon content is
The strength and hardness of steel increase as carbon content increases. (True or
False) - ANSWER-True
3. List three products produced on a rolling mill. - ANSWER-1. sheet
2. plate
