Henry Cort's original puddling process only worked where the raw material was white cast iron, rather than the grey pig iron that was the usual raw material for finery forges.
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In the early 19th century, Hall discovered that the addition of iron oxide to the charge of the puddling furnace caused a violent reaction, in which the pig iron was puddling process before decarburisation was complete.
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Did you mean'can I have more info on the development of spring steel ? ( if so you may wish to look at the crucible steel and puddling process Please clarify ? 87.102.35.119 12 : 59, 4 February 2007 ( UTC)
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The Han-era Chinese were also able to convert cast iron and pig iron into wrought iron and steel by using the finery forge and puddling process, the earliest specimens of such dating to the 2nd century BCE and found at Tieshengguo near Mount Song of Henan province.
