12.1-12.5 MMET 207 V1 EXAM
QUESTIONS AND ANSWERS. VERIFIED
2025/2026.
What is the basic ingredient for steel? - ANS Iron, which occurs in various naturally occurring
oxides.
What are the two principal iron ores mentioned? - ANS Hematite (Fe2O3) and magnetite
(Fe3O4).
What is taconite? - ANS A siliceous rock containing low-volume concentrations of iron.
What process is used to concentrate iron ore on site? - ANS Pelletizing, which involves
crushing and concentrating the iron-rich portions.
What is the typical iron percentage in pelletized iron oxide? - ANS 70% or greater.
How is most iron ore transported to steel mills in the U.S.? - ANS By ore boat, often located
near waterways.
Where is the U.S. steel industry historically centered? - ANS The Great Lakes region.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,What is the role of coke in the blast furnace? - ANS It serves as a source of heat and a
reducing gas to detach oxygen from iron oxide.
What is the purpose of limestone in the blast furnace? - ANS To act as a flux, helping to
remove impurities from the iron ore.
What is produced at the bottom of the blast furnace? - ANS Pig iron.
What is pig iron characterized by? - ANS High carbon content, making it brittle and unsuitable
for engineering materials.
What is the carbon content limit for steel? - ANS Between approximately 0.06% and 2.0%.
What happens to iron-carbon alloys with less than 0.005% carbon? - ANS They are
considered pure iron.
What is the typical carbon content in pig iron? - ANS About 4% to 5%.
What must be removed from pig iron to make steel? - ANS Impurities such as silicon, sulfur,
phosphorus, and manganese.
What basic process is used to remove impurities from pig iron? - ANS Oxidation.
What is the chemical reaction for producing carbon monoxide in the blast furnace? -
ANS CO2 + C (excess coke) → 2CO.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is the significance of the blast furnace in steel production? - ANS It is a chemical reactor
where iron ore is reduced to metallic iron.
What is the environmental concern associated with blast furnaces? - ANS They produce
methane and CO, which must be contained.
What percentage of worldwide steel production was accounted for by direct reduction
processes in 2008? - ANS About 6%.
What is the iron carbide process? - ANS A direct reduction process where iron ore is reacted
with methane and hydrogen to produce iron carbide.
What is the predicted future of blast furnaces according to the U.S. steel industry? - ANS By
2015, there may be no blast furnaces; steel making will be limited to recycled steel.
What is the role of minimills in steel production? - ANS They primarily use recycled scrap and
help manage impurity accumulation.
What is the typical use of pure iron? - ANS For special applications like magnetic devices and
enameling steels.
What happens to cast irons with more than 2% carbon? - ANS They become too brittle for
rolling or other fabrication techniques.
What is the primary function of the blast furnace charge? - ANS To provide the necessary
materials for the reduction of iron oxide to metallic iron.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS. VERIFIED
2025/2026.
What is the basic ingredient for steel? - ANS Iron, which occurs in various naturally occurring
oxides.
What are the two principal iron ores mentioned? - ANS Hematite (Fe2O3) and magnetite
(Fe3O4).
What is taconite? - ANS A siliceous rock containing low-volume concentrations of iron.
What process is used to concentrate iron ore on site? - ANS Pelletizing, which involves
crushing and concentrating the iron-rich portions.
What is the typical iron percentage in pelletized iron oxide? - ANS 70% or greater.
How is most iron ore transported to steel mills in the U.S.? - ANS By ore boat, often located
near waterways.
Where is the U.S. steel industry historically centered? - ANS The Great Lakes region.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,What is the role of coke in the blast furnace? - ANS It serves as a source of heat and a
reducing gas to detach oxygen from iron oxide.
What is the purpose of limestone in the blast furnace? - ANS To act as a flux, helping to
remove impurities from the iron ore.
What is produced at the bottom of the blast furnace? - ANS Pig iron.
What is pig iron characterized by? - ANS High carbon content, making it brittle and unsuitable
for engineering materials.
What is the carbon content limit for steel? - ANS Between approximately 0.06% and 2.0%.
What happens to iron-carbon alloys with less than 0.005% carbon? - ANS They are
considered pure iron.
What is the typical carbon content in pig iron? - ANS About 4% to 5%.
What must be removed from pig iron to make steel? - ANS Impurities such as silicon, sulfur,
phosphorus, and manganese.
What basic process is used to remove impurities from pig iron? - ANS Oxidation.
What is the chemical reaction for producing carbon monoxide in the blast furnace? -
ANS CO2 + C (excess coke) → 2CO.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is the significance of the blast furnace in steel production? - ANS It is a chemical reactor
where iron ore is reduced to metallic iron.
What is the environmental concern associated with blast furnaces? - ANS They produce
methane and CO, which must be contained.
What percentage of worldwide steel production was accounted for by direct reduction
processes in 2008? - ANS About 6%.
What is the iron carbide process? - ANS A direct reduction process where iron ore is reacted
with methane and hydrogen to produce iron carbide.
What is the predicted future of blast furnaces according to the U.S. steel industry? - ANS By
2015, there may be no blast furnaces; steel making will be limited to recycled steel.
What is the role of minimills in steel production? - ANS They primarily use recycled scrap and
help manage impurity accumulation.
What is the typical use of pure iron? - ANS For special applications like magnetic devices and
enameling steels.
What happens to cast irons with more than 2% carbon? - ANS They become too brittle for
rolling or other fabrication techniques.
What is the primary function of the blast furnace charge? - ANS To provide the necessary
materials for the reduction of iron oxide to metallic iron.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
