1 True or False Hotworking steel by rolling structural shap

1. True or False? - Hot-working steel by rolling structural shapes at 1000 deg.C will cause great deformations in the grain structure, but this is generally relieved by leaving beams to cool naturally, which allows time for internal heat to anneal the grain structure. (Circle correct answer) True or False ? - Cast iron products are more brittle than steel because cast iron contains 2. much greater carbon content that often forms hard ferrite during the slow cooling of the iron. (Circle the correct answer) 3. True or False? -In using the electromotive series to select a sacrificial metal to protect another metal, the metal to be protected should have a higher electromotive value than the metal that will be sacrificed (Circle the correct answer) 4. True or False?- Steel corrosion occurs in a wet environment when electrons of iron are conducted through the steel to a place where they are consumed in a reaction with oxygen and water to form hydroxyl ions, which then creates a ferrous-hydroxide in the electron-depleted metal, and then further reacts with oxygen to create the fully corroded ferric-oxide. (Circle correct answer) When red-hot steel is quenched, what is the result in terms of ductility and strength? 5. Ductility HIGH? Low? Strength HIGH? Low? (Circle correct answers) or or 6. True or False? In a typical cathodic protection system, bars of lead are often buried in ground as sacrificial anodes to keep buried steel pipelines from rusting away. (Circle correct answer) 7. Which of the following metals is usually used as a galvanizing coating on steel guard rails? a. Tin b. Lead c. Aluminum d. Zine (Circle correct answer) 8. List the four different types of cast iron. (1/2 pt. each) 2 9. Circle the one type of cast iron you listed in No. 8 that is the most brittle? 10. Describe briefly what the atoms of an alloy (such as carbon in iron) do to increase both the strength and resistance to deformation of the metal in which they are present. 11. In addition to iron ore, what twe other substances go into the Blast Furnace in production of iron and steel? (1/2 pt. each) 12. True or False ?-When molten low-carbon (0.2%) steel is cooled, austenite (having body centered cubic atomic structure) forms first, and on further cooling, the austenite structure changes into a mix of ferrite (that is face-centered cubic) and iron carbide. (Circle the correct answer) TURN OVER FOR REMAINDER OF QUIZ QUESTIONS

Solution

1st answer is False

2nd answer is ... True

3rd answer is .. True

4th answer is . True