1. What is steel?2. What are the main properties of steel?3. What are the drawbacks of steel?4. What kinds of steel do you know? Where are they used?5. What gives the addition of manganese, silicon and chromium to steel?6. What can be made of mild steels (medium-carbon steels, high-carbon steels)?7. What kind of steels can be forged and welded?8. How can we get rust-proof (stainless) steel?9. What is used to form a hard surface on steel?10. What are high-speed steels alloyed with?