I want to know the answer to the following question:
What type of process was used to convert various metals into steel?
All the background I'm provided with is that "Evidence suggests that blast furnaces, that convert raw iron ore into pig iron, which can be remelted in a cupola furnace to produce cast iron by means of a cold blast and hot blast, were operational in China by the late Spring and Autumn period (722–481 BC).". Is that enough to answer the question?