Assertion: mild steel's carbon | /r/AtLocation | the iron
Facets:
Source sentences:
text: The iron becomes mild steel, steel or any other type of steel depending on how much carbon is added to the iron.
text: Where more strength is needed for i.e. structural uses, more carbon is added to the metal.
text: Carbons and other metals like chromium are added to the iron to make alloys and different qualities or grades of steel, such as stainless steel.