Properties and Uses of Cast Iron

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What is the primary advantage of using steel structures over concrete structures for tall buildings and large span bridges?

It is less expensive to produce
It has a large strength to weight ratio (correct)
It is more resistant to corrosion
It is more durable

What percentage of iron does pig iron contain?

99-100%
80-85%
90-95% (correct)
95-99%

What is the primary advantage of factory production in steel structures?

Greater durability
Faster construction time
Better quality control, higher reliability and safety (correct)
Lower cost of production

What is the main disadvantage of steel structures that requires special protection?

It is prone to corrosion (B) Signup and view all the answers

What is the primary advantage of steel structures in terms of their ability to withstand severe loadings?

They are ductile and robust (C) Signup and view all the answers

What is the main advantage of dismantling and recycling steel structures?

It reduces the life cycle cost of the structure (A) Signup and view all the answers

What is the primary characteristic of cast iron that makes it ideal for making castings?

Low melting point (D) Signup and view all the answers

What is the difference between pig iron and cast iron?

Pig iron changes its name to cast iron when remelted (A) Signup and view all the answers

What is the primary advantage of wrought iron over cast iron?

Higher resistance to corrosion (A) Signup and view all the answers

What is the primary purpose of the basic oxygen furnace (BOF) in steel production?

Reduce the carbon content in iron (B) Signup and view all the answers

What is the final step in the steel production process?

Secondary forming – heat treatment, coating, etc. (A) Signup and view all the answers

What is the primary difference between a blast furnace and an electric arc furnace (EAF)?

Blast furnace is used for primary steel making, while EAF is used for secondary steel making (A) Signup and view all the answers

What occurs to the microstructure of steel when it is rolled below its recrystallization temperature?

The steel becomes harder and more brittle due to dislocations. (C) Signup and view all the answers

What is the primary purpose of heating steel above its recrystallization temperature?

To create a more uniform grain size and carbon distribution. (B) Signup and view all the answers

Which type of steel is characterized by the addition of 10-20% chromium and other elements, and is often used in outdoor construction?

Stainless steel (C) Signup and view all the answers

What is the result of cold rolling on the steel's properties?

The steel becomes harder and more brittle. (D) Signup and view all the answers

What is the primary difference between carbon steels and alloy steels?

The presence of additional alloying elements in the steel. (B) Signup and view all the answers

What is the purpose of adding alloying elements such as tungsten, molybdenum, and vanadium to carbon steels?

To enhance the steel's heat resistance and general durability. (D) Signup and view all the answers