Pre Historic evidence of iron : The Rigveda refers to ayas ( RV 2.20.8) . The Sanskrit term Ayas means metal and can refer to bronze, copper or iron ;The Genesis says seven generations from Adam had “an instructor of every artificer in brass and iron"
Use of Iron in various civilizations : Around 4000 BC, the Sumerians and the Egyptians made spears and ornaments from iron recovered from the meteorites ; The Iron age started in late 2nd Millennium BC ; Delhi’s rustless iron pillar at Mehrauli.
Use of Iron in various civilizations : Wootz steel first appeared in India between 300 BC and AD 500 ; Damascus swords were prized for their strength and sharpness.
Major Steel Making Processes : Bessemer process, Open hearth process, Electric arc process, Oxygen steel making process and Midrex process.
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