Precision Machining Technology Unit 6

Questions and Answers

What is the difference between ferrous and nonferrous metals?

Nonferrous metals contain iron.

Nonferrous metals are composed primarily of iron.

Ferrous metals do not contain iron.

Ferrous metals are composed primarily of iron. (correct)

What is an alloy?

A metal with other elements intentionally added to create different characteristics.

Name three alloying elements added to steel.

Carbon, Chromium, Nickel.

Define cast iron.

A hard and brittle metal with a high carbon content. Signup and view all the answers

What element makes stainless steel corrosion resistant?

Chromium. Signup and view all the answers

What small particles of alloys are flammable?

Magnesium. Signup and view all the answers

What are two major benefits of titanium?

High strength Signup and view all the answers

What does AISI stand for?

American Iron and Steel Institute. Signup and view all the answers

What does SAE stand for?

Society of Automotive Engineers. Signup and view all the answers

What are the major alloying elements in 8730 steel?

Manganese, Chromium, Nickel, and Molybdenum. Signup and view all the answers

What is the carbon content of 8730 steel?

0.25%-0.35%. Signup and view all the answers

What does IADS stand for?

International Alloy Designation system. Signup and view all the answers

What is the overall purity of 1030 Aluminum?

99.3%. Signup and view all the answers

What are the major alloying elements of 6061 Aluminum?

Magnesium and Silicon. Signup and view all the answers

What does UNS stand for?

Unified Number System. Signup and view all the answers

What is an alloy steel?

Steel with a variety of added elements. Signup and view all the answers

What is an aluminum alloy?

An alloy in which aluminum has the largest percent of all the elements. Signup and view all the answers

What is brass?

An alloy of copper and zinc. Signup and view all the answers

What is bronze?

An alloy of copper and tin and sometimes other metals. Signup and view all the answers

What is cast iron?

An alloy of iron and carbon. Signup and view all the answers

What is a copper alloy?

A mixture of copper (as the principal metal) with other metals. Signup and view all the answers

What are superalloys?

Nickel-based metals with UNS prefix S, N, or R. Signup and view all the answers

Give examples of nonferrous metals.

Copper, Magnesium, and Titanium. Signup and view all the answers

What is the UNS prefix for cast iron?

F. Signup and view all the answers

What is the UNS prefix for titanium?

R. Signup and view all the answers

What is the UNS prefix for copper alloys?

C. Signup and view all the answers

Give an example of what aluminum is used for.

Best used for handrails. Signup and view all the answers

Give an example of what cast iron is used for.

Car suspension parts. Signup and view all the answers

Give an example of what tool steel is used for.

Punch, die, etc. Signup and view all the answers

Give an example of what cold rolled steel is used for.

Aircraft brace. Signup and view all the answers

Give an example of what martensitic stainless steels are used for.

Best used for knife blades. Signup and view all the answers

Give an example of what austenitic stainless steels are used for.

Best used for conveyor parts. Signup and view all the answers

What is austenitic?

A stainless steel that is not magnetic. Signup and view all the answers

What are the types of cast iron?

Gray iron, malleable iron, and ductile iron. Signup and view all the answers

What are the types of stainless steel?

Austenitic, ferritic, and martensitic, and contains a minimum of 10% chromium. Signup and view all the answers

Study Notes

Metal Composition and Classification

Ferrous Metals: Composed primarily of iron; nonferrous metals lack iron.
Alloy Definition: A metal mixed with other elements to achieve various characteristics.

Alloying Elements

Common Alloying Elements in Steel: Carbon, Chromium, Nickel.
8730 Steel Alloying Elements: Manganese, Chromium, Nickel, Molybdenum.
Major Alloying Elements in 6061 Aluminum: Magnesium and Silicon.

Material Properties

Cast Iron: Hard and brittle metal with high carbon content; used in car suspension parts.
Stainless Steel Corrosion Resistance: Achieved by adding Chromium.
Titanium Benefits: Low density and high strength; used in aerospace components, motorsports, and surgical implants.
Sulfur Alloys: Example of superalloys includes nickel-based metals with the UNS prefix S, N, or R.

Metal Identification Systems

AISI (American Iron and Steel Institute): Organization providing standards for metals.
SAE (Society of Automotive Engineers): Focuses on automotive standards.
IADS (International Alloy Designation System): An older alloy classification system.
UNS (Unified Number System): A system for identifying metals with specific prefixes.

Carbon and Purity Content

8730 Steel Carbon Content: Ranges from 0.25% to 0.35%.
Purity of 1030 Aluminum: 99.3%.

Alloy Types

Alloy Steel: Steel enhanced by various added elements.
Aluminum Alloy: Contains aluminum as the majority metal.
Brass: Alloy of copper and zinc.
Bronze: Alloy of copper and tin, sometimes with other metals.
Copper Alloy: Mixture of copper as the principal metal with others.
Types of Cast Iron: Includes gray iron, malleable iron, and ductile iron.
Stainless Steel Types: Austenitic, ferritic, martensitic; contains at least 10% chromium.

Metal Applications

Aluminum: Best suited for applications like handrails.
Tool Steel: Utilized for punches, dies, etc.
Cold Rolled Steel: Commonly used in aircraft braces.
Martensitic Stainless Steels: Ideal for knife blades.
Austenitic Stainless Steels: Recommended for conveyor parts.

UNS Prefixes

Cast Iron Prefix: F
Titanium Prefix: R
Copper Alloys Prefix: C

Nonferrous Metals

Examples: Copper, magnesium, and titanium; not containing iron.

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Description

This quiz focuses on key concepts from Section 2, Unit 6 of Precision Machining Technology, specifically regarding metal composition and classification. Test your understanding of ferrous and nonferrous metals, alloys, and alloying elements in steel. Perfect for students looking to reinforce their knowledge in metalworking.