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Hot Working vs Cold Working in Steel Processing

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Hot Working vs Cold Working in Steel Processing

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Questions and Answers

Which process is preferred when the strength of the part is important?

Casting

Rolling

Machining

Forging (correct)

What is the result of cold working on steel?

An increase in strength and hardness, and a decrease in ductility (correct)

A decrease in density and an increase in coarse grains

An increase in ductility and a decrease in strength

A change in the color of the steel

What is the primary goal of tempering?

To reduce the residual stresses and increase ductility (correct)

To facilitate machining and cold shaping

To produce a special structure

To increase the hardness of the steel

What is the result of quenching on the ductility and toughness of the steel?

It reduces ductility and toughness (C) Signup and view all the answers

What is the purpose of the first stage of rolling?

To reduce the size of the ingot to a smaller cross section (A) Signup and view all the answers

What is the primary difference between normalizing and annealing?

The rate of cooling (A) Signup and view all the answers

What is the term for the intermediate shape of the steel when its cross section is square or rectangular?

Bloom (B) Signup and view all the answers

What is the consequence of overworking, whether hot or cold?

Brittleness (B) Signup and view all the answers

What is the result of forging on the grain size of the metal?

It reduces the grain size (D) Signup and view all the answers

What is the purpose of heating to a lower temperature range in tempering?

To produce greater hardness and strength (C) Signup and view all the answers

Why is cold working preferred for certain applications?

Because it results in more accurate finishes and smoother surfaces (C) Signup and view all the answers

What is the purpose of turning the ingot 90° during the second stage of rolling?

To obtain the desired cross section of the final product (C) Signup and view all the answers

What is the primary difference between rolling and extrusion?

The number of operations required to produce the final shape (D) Signup and view all the answers

Which process can produce a product with a cross section of nearly 2 ft?

Extrusion (A) Signup and view all the answers

What is the primary advantage of cold drawing over hot rolling?

All of the above (D) Signup and view all the answers

What is the primary difference between forging and rolling?

The application of pressure or blows to deform the material (C) Signup and view all the answers

What is the primary purpose of forging?

To produce a product with a specific shape or cross-section (B) Signup and view all the answers

What is the common feature of rolling and extrusion?

Both can produce a product with a high-quality surface (D) Signup and view all the answers