I believe it isn’t. Ferrous alloys turn red hot way before melting (at
around 727ºC/1333 F) and they will start to form a liquid phase when over
1100ºC/2000 F, at this temperature it should have a yellowish, nearly
white, intense glow. Source: The Iron-Iron Carbide Phase Diagram, been
studying this shit for 4 years, performed several quenches on a few kinds
of steel. From what I know of non-ferrous metal alloys, this looks like
series 1000 (ISO I guess) Aluminum.
Solar thermal collection is and always will be more efficient than
photovoltaics. With solar thermal you are absorbing a much larger swath of
the solar irradiance specifically in the infrared region than solar cells-
which only absorb in the visual.
@neutrillium heat is heat so in that aspect there is no difference there
would be a difference in steel making since most steel processes use coke
fired furnaces the coke not only heats the furnace but adds most of the
carbon which is what makes iron, steel…. well carbon and a few other