Assertion: impurity | /r/HasProperty | removed in steelmaking
Facets:
value: from the sourced iron
type: OTHER
Source sentences:
text: In steelmaking, impurities such as nitrogen, silicon, phosphorus, sulfur and excess carbon (most important impurity) are removed from the sourced iron, and alloying elements such as manganese, nickel, chromium, carbon and vanadium are added to produce different grades of steel.