Smelting Daily Question 11.14 (Chinese Version)

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1. Please hide your replies; editing after posting is ineffective! Delete directly without hiding! 2. Hiding method: http://bbs.hcbbs.com/thread-492556-1-1.html 3. 10 points or 1 charm for a completely correct answer, 1 point for a completely wrong answer, and 5 points for an answer that is somewhere in between. Multiple-choice question: The main raw material used in steelmaking is blast furnace iron melt; in addition, there are scrap steel, sponge iron, slag formers, alloying agents, and oxidizing agents. Blast furnace iron melt is composed of iron and other chemical elements, the most common of which are carbon, manganese, phosphorus, sulfur, and silicon. Pig iron may contain 3%~4.5% of ____, 0.05%~2.5% of _____, 0.02%~0.06% of _____, 0.3% or more of _____, as well as small amounts of phosphorus. A large number of impurity elements in molten iron must be removed, in part or in whole; in fact, this is the main task of steelmaking. a. Carbon, Manganese, Sulfur, Silicon b. Manganese, Silicon, Sulfur, Carbon c. Carbon, Sulfur, Silicon, Manganese d. Manganese, Silicon, Carbon, Sulfur The answer for this issue will be provided in the next issue. The answers to the previous issue can be found there.