Keep in mind we still make steel here in the USA. An abundance of scrap and the electric Arc furnace is less expensive than making pig iron from Iron Ore/Coke and limestone. Though electric arc/scrap metal has some issues, most related to impurities that are difficult to remove from the heat.
I had done two courses in metallurgy, from Geneva College, here in Beaver Falls, PA, mid 1970's. As part of the course we had done (2) field trips. Everything Dave has modeled was part of the first field trip to Midland, PA, Then Colt Industries/Crucible Steel.
Even today, many years later, a very young farm kid, fresh out of college, was, open eyed impressed. We were in control booth, one of the BOF, Basic Oxygen Furnaces, when a heat of pig iron was added to the vessel. The operator lowered the oxygen lance and began the removal of carbon/ and adding alloys. A lot of power, enough so, that the room we were in, shook. quite an exothermic reaction. Fast forward to last summer I was working a job in Midland Pa, their new wealth, the Cyber School, which overlooks a lot of what is left of Crucible Steel. Sad, knowing what was there at one time. There were also coke ovens on site.
Thanks again Dave, great adventure in the foggy parts of my aging mind.
Mike. 
