16. Which one is the toughest? (a) CFRP (b) GFRP (c) High Strength (d) Mild Steel 17. A step in modern steel making methodology that shapes and casts the molten steel as a cooled down mold. (a) continuous casting (b) finalized manufacturing (a) continuous casting (b) electric arc (c) primary forming (d) secondary steel making 18. In this furnace, there is a refining process while you melt the scrap that removes its impurities or add certain elements to bring it back to its original composition. (c) induction (d) refractory lining 19. Close consideration for property of brittle materials is (a) not strong not tough (b) strong not tough (c) strong and ductile (d) strong and tough

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Types and properties of steel

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur,  chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated around the world, each with its chemical composition, and special numbering systems have been devised in various countries to classify the vast number of alloys.