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carbon steel
The information in this article is totally erroneous and fabricated by someone who knows absolutely nothing about metallurgy. Cast iron and wrought iron are not elements or types of metals or any type of alloys but in fact simply different products of metallurgical processes of fabricating the element Iron into tangible items of use or tools but are in no way alloying elements and the mixture or combination of these products will demonstrably not produce carbon steel as inaccurately stated in this article. Also incorrect is the listing of the phases of iron as graphite and martensite are absolutely not phases of steel. There are three phases of steel, ferrite, cementite and austenite. Graphite is a crystalline structure of carbon, as it exists in ore and definitely not iron or steel. It nothing to do with iron or steel or the phases thereof. It is a separate element that is sometimes used as an alloying element in steel. Graphite is not steel, iron or any phase of steel at all. Martensite is a diffusionless transformation of austenite that simply alters the crystal structure of austenite from the rapid cooling or quenching of steel that is in the austenitic phase or temperature. Neither graphite or martensite are "Phases" of steel.