Iron

#Iron is a chemical element with symbol Fe (from Latin: ferrum) and atomic number 26.

iron bars
iron bars

It is a metal in the first transition series.
Iron doesn’t found in nature in its free shape and (Fe) , even when purifying and deoxidation iron we can’t get 100% pure iron and it stays impured with carbon .

iron
iron

The amount of carbon that exists in iron #alloy determines alloy properties and its usage . when the carbon ratio rises the toughness rises .
Also the crystal system of iron and carbon atoms and atoms arrangement effects on alloy properties , so Fe-C phase diagram shows crystals systems in iron-carbon
alloys in variable temperatures with carbon ratio to know alloy properties and its usage .

Fe-C phase diagram
Fe-C phase diagram

The iron alloy that has up to 2.14% carbon is called #steel , and the iron alloy that has (2.14%-6%) carbon is called #cast iron .

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