22nd December 2017, 03:36 AM | #18 | ||
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Quote:
As you noted, while it takes high temperatures to forge weld iron, it's otherwise low-tech: Quote:
Casting (low-carbon) iron or steel is much more technologically demanding, and I know of nobody doing it before the Industrial Evolution. The Chinese were casting cast iron about 2000 years ago, but "cast iron" has a quite low melting point (about 1200C/2200F) since it's a saturated carbon solution (typically 3%-4% carbon). Iron forging/welding technology might have preceding iron smelting technology. First, it allows small pieces of meteoric or telluric iron (native iron, i.e., naturally occurring metallic iron of terrestrial origin) to be used to make larger objects than would be possible without welding. Second, it appears that there was occasional accidental smelting of iron in the copper industry, when iron oxide was used a flux in copper smelting (and temperature got a little higher than needed for copper smelting). So there was motivation for forge welding iron. Forge welding of copper alloys and gold was already known, so the basic idea was there. Judging by the history of the techniques, forge welding iron is much easier than casting (low carbon) iron. But "Who?" is a difficult question to answer. |
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