Cementation Process

Crucible Process

Bessemer Process

Direct Oxygen Process

Open Hearth Process

Duplex Process

Electric Refining Process

References:

https://www.steel.org/Making%20Steel/How%20Its%20Made/Processes/Processes%20Info/Electric%20Arc%20Furnace%20Steelmaking.aspx http://www.britannica.com/technology/open-hearth-process https://en.wikipedia.org/wiki/Cementation_process https://en.wikipedia.org/wiki/Bessemer_process http://en.stahl-online.de/index.php/topics/technology/steelmaking/ http://ispatguru.com/stainless-steel-manufacturing-processes