2020年3月24日 · Spiegeleisen is more likely to be called ferro-manganese today. I expect it is added at the end to minimize losses of Mn to the slag. Mn does contribute to hardenability but the primary reason for its use is to combine with residual sulfur to make MnS .

2016年7月7日 · The Bessemer process for making steel involves blowing air or oxygen thru hot iron. Impurities and carbon oxidize away.

2016年10月21日 · I am trying to cast bismuth, which melts at 271.4 °C. Silicone rubber seemed like a good material to use for a mold, given its flexibility and the ease with which it can be cast itself, as well as ...

2019年8月8日 · The single most important factor is strength ( mechanical compressive ); coal is heated to make coke, the resulting coke is stronger than the original coal.