【Daily Question】2015.12.12 Harmful elements in steel (2 wealth points for a reply; +3 to +8 wealth points if the answer is correct)

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This post was last edited by FORREST_GUMP on 2015-12-13 at 17:25. The Mechanical Forum has introduced the \"Question of the Day\" feature, which aims to foster an active atmosphere for technical discussions and guide the direction of such exchanges, while also providing users with financial rewards to help them experience various cool features. Multiple-choice question: Among the following elements, (C) is a harmful impurity in steel, as it can cause thermal brittleness and welding hot cracks. A. Carbon ； B. Manganese ； C. Sulfur ； Please note: We will close this thread after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation. Charisma Reward: If you post a topic in this section within two days to provide a detailed explanation or discussion of the knowledge points related to this question, please reply/comment in this post to let us know, and we will award you charisma points. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights. The competition for \"Active Experts and Weekly Stars\" in the Machinery section has begun: http://bbs.hcbbs.com/thread-1489069-1-1.html. The 2015 HaiChuan Top 10 selection – please recommend candidates; there are prizes available: http://bbs.hcbbs.com/thread-1505454-1-1.html