Posted by Owen Aaland on January 08, 2010 at 08:58:00 from (65.161.86.2):
In Reply to: Engine oil posted by Don McCullough on January 07, 2010 at 07:16:18:
Actually it is not very difficult to remove carbon from steel. Cast iron runs about four percent carbon so if there is too much cast in a heat you will have a lot of carbon that needs to be removed.
I worked in a steel melt shop for a while as an assistant on the electric furnace. After all the metal charge in the furnace was melted we had to take samples to the lab and they would send the results back so we knew how much of each element had to be added to get the right mixture. If the carbon level was too low we would dip the three carbon electrodes in the molten pool and carbon would be added. To remove carbon you simply pumped oxygen into the molten pool using a length of black steel pipe. The electrical arcing would mix the steel so that it would be uniform in texture. It would take about a half hour to raise the temperature from about 2500 degrees where it was all melted to 2875 which was the temperature that the furnace was tapped. We melted 80,000 lbs of recycled steel in each pour.
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