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					Originally Posted by  Lee
					 
				 
				The "chilled iron plow" was developed in the mid 19th century for casting plows where a heat sink was incorporated into the mold to rapidly cool and harden the soil contacting surfaces. Perhaps something similar was tried with swords, but David's explaination seems more likely. 
			
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 no not "cast"  steel but cast into blanks in their rough final form just as today many steel items are.  most of the "forged" chinese tools are cast for example