General Steel Metallurgy 3

  1. The melting point of pure iron is
    2800degF (1550degC)
  2. When impurities in molten steel are not fluxed away by limestone, what is the finished product is called?
    Pig Iron
  3. Approximately how much carbon and silicon are in Pig Iron?
    • 3%-4% carbon
    • 1%-3% silicon
  4. What minerals are fluxed away by limestone?
    • Calcium
    • Magnesium
    • Aluminum Oxide
  5. Bessemer steel that is further refined into "duplexed" steel has what impurities removed?
    • Sulfur
    • Phosphorus
    • Iron Oxide
  6. Two processes for reducing the carbon content of pig iron are:
    The Bessemer Process and the Oxygen Process.
  7. Tool steel and special-alloy steel can be refined in what type of furnace?
    An Electric Arc (or Induction) furnace.
  8. How much carbon is in low carbon steel?
    Less than 0.30% carbon
  9. How much carbon is in medium carbon steel?
    0.30% to 0.70% carbon
  10. How much carbon is in high carbon steel?
    0.70% to 1.4% carbon
  11. Low alloy steel contains what percentage of alloying elements?
    less than 8% total alloying ingredients
  12. High alloy steel contains what percentage of alloying elements?
    more than 8% total alloying ingredients.
  13. What ingredient is added to steel for deoxidation?
  14. Which of these ingredients does not increase steel's hardness?

    D. Titanium

    Titanium fixes carbon and reduces hardness.
  15. Which two of these ingredients do not increase steel's strength?
    • a.manganese reduces brittleness by combining with sulfur.
    • b.nickel increases toughness, hardness, and corrosion resistance, but not strength.
  16. Body-centered cubic steel is called

    C. ferrite
  17. A hard and very brittle super-saturated solution of carbon in iron is called

    C. martensite
  18. Face-centered cubic steel is called

    B. austenite
  19. What is the approximate carbon content of cast iron?
    2% carbon
  20. What is the carbon content of wrought iron?
    less than 0.1% carbon
  21. What are the effects of low and high levels of chromium in steel?
    Up to 2% increases hardenability. 4-18% increases corrosion resistance.
  22. What are the effects of low and high levels of nickel in steel?
    2-5% increases toughness. 12-20% increases corrosion resistance.
  23. Iron Carbide is also known as

    A. Cementite

    It contains about 6.7% carbon.
  24. Pearlite consists of what two components?

    E. Ferrite and Cementite
  25. FCC iron is also known as

    B. Gamma Iron
  26. BCC iron can either be:

    C.  Delta or alpha
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General Steel Metallurgy 3
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