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Wrought iron is commercially pure iron, having a very small carbon content (carbon content does not exceed 0.15 per cent), but usually contains some slag. worked) into a finished product. The unwrought commodity is according to its form 'bar iron', 'rod iron', etc. Wrought iron has been used for thousands of years, and represents the "iron" that is referred to throughout history.
Word Origin: The word “wrought” is the old past tense of the verb to work. Wrought iron literally means Worked iron. Wrought iron is rarely completely pure. It is a fibrous material with many strands of slag are mixed into the metal. The fibers of wrought iron gives it some interesting properties, however. Hammering a piece of wrought iron cold causes the fibers to become packed tighter, which makes the iron both brittle and hard. As wrought iron lacks the carbon content necessary for tempering, it is believed that cultures that never discovered how to make steel would cold work wrought iron tools in order to harden them.
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