Applied Science - Metals and Alloys

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Questions and Answers

Which brass alloy is specifically mentioned as being suitable for hot work?

  • Bell Metal
  • Naval Brass
  • Admiralty Brass (correct)
  • German Silver or Nickel Silver

Which of the following alloys is known for its resistance to corrosion by seawater?

  • Aluminium Bronze
  • Naval Brass (correct)
  • Bell Metal
  • Gun Metal

Which of the following metals is NOT a component of Wood's Metal?

  • Lead
  • Tin
  • Zinc (correct)
  • Cadmium

Which alloy is primarily used for decorative articles and utensils due to its silver-like appearance?

<p>German Silver or Nickel Silver (A)</p> Signup and view all the answers

Which alloy is known for its golden color and is frequently used in casting operations?

<p>Aluminium Bronze (C)</p> Signup and view all the answers

Which bronze alloy is particularly known for its resistance to the force of explosion?

<p>Gun Metal (C)</p> Signup and view all the answers

Which alloy is primarily used for bearings and springs due to its low coefficient of friction?

<p>Phosphor Bronze (D)</p> Signup and view all the answers

In solder, what happens to the melting point as the percentage of tin increases?

<p>It increases. (B)</p> Signup and view all the answers

What is the primary purpose of Brazing Alloys?

<p>Soldering steel joints by fusing. (C)</p> Signup and view all the answers

Which alloy is commonly used for marine castings and condenser tubes?

<p>Naval Brass (B)</p> Signup and view all the answers

What is the approximate melting point of Wood's Metal?

<p>71°C (C)</p> Signup and view all the answers

Which of the following alloys is NOT specifically mentioned as being used for marine applications?

<p>German Silver or Nickel Silver (B)</p> Signup and view all the answers

Which of the following is NOT a property of Duralumin?

<p>Magnetic (D)</p> Signup and view all the answers

Which alloy is primarily recognized for its use in bells and gongs?

<p>Bell Metal (D)</p> Signup and view all the answers

What is the main application of Tinmann's Solder?

<p>Joining articles of tin. (C)</p> Signup and view all the answers

How does heat treatment affect the tensile strength of Duralumin?

<p>It increases tensile strength. (B)</p> Signup and view all the answers

What is the carbon content range for medium carbon steel?

<p>0.3 - 0.6% (C)</p> Signup and view all the answers

Which of the following alloys is NOT a type of brass?

<p>Bell Metal (B)</p> Signup and view all the answers

What is the approximate percentage of tin in Soft Solder?

<p>30% - 60% (D)</p> Signup and view all the answers

Which of the following is NOT a common application of Duralumin?

<p>Coin minting (C)</p> Signup and view all the answers

Which of these is a property of mild steel?

<p>Good shock and impact resistance (D)</p> Signup and view all the answers

Which type of steel is best suited for making machine and gun parts due to its high tensile strength?

<p>Medium carbon steel (D)</p> Signup and view all the answers

Which of the following is a characteristic of brass?

<p>High electrical conductivity (D)</p> Signup and view all the answers

What is the primary use of cartridge brass (70% Cu, 30% Zn)?

<p>Making tubes, sheets, and cold press work (C)</p> Signup and view all the answers

How does heat treatment affect the properties of brass?

<p>It improves its hardness. (C)</p> Signup and view all the answers

What is the primary difference between mild steel and medium carbon steel?

<p>Carbon content (C)</p> Signup and view all the answers

Which of the following metals is NOT a non-ferrous alloy?

<p>Steel (D)</p> Signup and view all the answers

What is the primary application of high carbon steel?

<p>Manufacturing of cutting tools (A)</p> Signup and view all the answers

What type of solder is used for joining lead pipes?

<p>Soft Solder (C)</p> Signup and view all the answers

Which type of brass is known for its golden color and is suitable for all drawing and forming operations?

<p>Dutch metal (C)</p> Signup and view all the answers

Flashcards

Mild Steel

Steel with 0.05 - 0.3% carbon; good shock resistance, low tensile strength.

Medium Carbon Steel

Steel with 0.3 - 0.6% carbon; tough, high tensile strength, weldable.

High Carbon Steel

Steel with 0.6 - 1.5% carbon; hard, wear-resistant, can cut well.

Brass

Copper alloy; high electrical conductivity, not weldable, heat-treated for hardness.

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Commercial Brass

Copper (90%) and Zinc (10%); strong, golden, used in furniture and hardware.

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Dutch Metal

Copper (80%) and Zinc (20%); strong, used for cheap jewelry and instruments.

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Cartridge Brass

Copper (70%) and Zinc (30%); strong, ductile, used in tubes and sheet work.

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Muntz Metal

Copper (60%) and Zinc (40%); stronger than 70/30 brass, used in various applications.

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Tensile Strength

Maximum stress a material can withstand while being stretched.

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Non-Ferrous Alloys

Alloys that do not contain iron; resistant to corrosion and lightweight.

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Admiralty Brass

An alloy containing 70% Cu, 29% Zn, and 1% Sn known for high corrosion resistance.

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Naval Brass

An alloy with 59% Cu, 40% Zn, and 1% Sn, ideal for seawater applications.

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German Silver

An alloy made of 62% Cu, 18% Zn, and 20% Ni, looks like silver and resists corrosion.

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Gun Metal

An alloy composed of 85% Cu, 5% Sn, 5% Zn, and 5% Pb, known for toughness and explosion resistance.

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Aluminium Bronze

An alloy of 90-93% Cu and 10-7% Al known for strength and resistance to corrosion.

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Phosphor Bronze

An alloy that consists of 96% Cu, 3.75% Sn, and 0.25% P, known for low friction and seawater resistance.

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Nickelbronze

An alloy made with 90% Cu, 9% Ni, and 1% Fe, known for high tensile strength.

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Bell Metal

An alloy of 80% Cu and 20% Sn, known for its hardness and sound resonance.

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Bronzes

Copper-tin alloys that are strong, tough, and resistant to wear.

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Solders

Low melting alloys of tin and lead used for joining materials.

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Soft Solder

An alloy used for soldering with lower melting points, commonly containing tin and lead.

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Brazing Alloys

Alloys, primarily with tin and antimony, used for fusing metals at high temperatures.

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Tinmann's Solder

A specific solder containing 66% tin and 34% lead, used for soldering tin articles.

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Duralumin

An alloy made mainly of aluminum, tough and lightweight, used in various applications.

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Wood's Metal

A fusible alloy comprising bismuth, lead, tin, and cadmium, with a low melting point.

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Melting Point of Soft Solders

Ranges between 180° - 250° C, as influenced by tin and lead ratios.

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Composition of Duralumin

Contains approximately 95% aluminum and small amounts of copper, magnesium, and manganese.

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Properties of Wood's Metal

Noted for its low melting point and ease of fusion, suitable for various applications.

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Applications of Duralumin

Used in aviation, automotive parts, and structural components due to its strength-to-weight ratio.

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Electrical Application of Wood's Metal

Utilized in electric fuses due to its fusibility and reliability under heat.

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Study Notes

Applied Science - Metals and Alloys

  • Steel Types:
    • Mild steel (low carbon) is easily weldable, has low tensile strength, and is resistant to shock and impact. Used in wires, chains, tubes, blades, and boiler plates.
    • Medium carbon steel (0.3-0.6% carbon) is stronger and tougher than mild steel, can be hardened by heat treatment, and is resistant to shock; used in railway engineering (rails, wheels, axles), machine parts, and shafts.
    • High carbon steel (0.6-1.5% carbon) is hard, tough, resistant to wear, creating sharp edges; used in tools, cutting instruments, and blades.
  • Brass Alloys:
    • Brasses are copper-zinc alloys.
    • Varying percentages of zinc (up to 45%) and other metals (like tin, manganese, aluminum, iron, lead) give special properties.
    • Strong, durable, machinable, corrosion resistant, and water resistant.
    • Used in various applications (sheets, utensils, condenser tubes, architectural metalwork, jewelry, rivets, hardware).
  • Copper Alloys:
    • Pure copper is highly conductive, used in electrical transmission cables and appliances.
    • Many alloys are used, mainly classified as Brasses and Bronzes.
  • Bronzes:
    • Bronze alloys are copper-tin alloys (with other possible added metals).
    • They are tough, strong, corrosion-resistant, and machinable.
    • Used in decorative items, utensils, cutlery, coinage, and tools (like gun barrels, hydraulic fittings, bearings).

Solders

  • Types:
    • Soft solders are low melting point alloys of tin and lead.
    • The percentages of tin and lead affect the hardness.
    • Brazing alloys are used for steel joints.
    • Tinman's solder (66% tin, 34% lead) is used for joining tin articles.
  • Uses:
    • Used in electrical connections, tin cans, and for joining lead pipes.

Duralumin

  • Composition: An aluminum alloy (95% aluminum, 4% copper, 0.5% magnesium, 0.5% manganese).
  • Properties: Light, tough, ductile, corrosion resistant, easily castable.
  • Applications: Aeronautics (aircraft parts), automotive components, and general engineering.

Wood's Metal

  • Composition: A fusible alloy of bismuth, lead, tin, and cadmium.
  • Properties: Low melting point (71°C).
  • Applications: Safety plugs for pressure cookers, boilers, fire alarms, water sprinklers, taking impressions of coins or medals.

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