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Jeroen Zuiderwijk
Industry Professional
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 Posted: Sat 23 Jan, 2010 3:49 am Post subject: |
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| M. Eversberg II wrote: | In period, would wrought with phosphorous still get used as-is (assuming the phosphorous didn't make it too hard to even work with), or would it have gone to a secondary market? Is there a way to remove the impurity using their technology? How common was this contaminated iron?
M. |
In non-quench hardened steel, phosphorous does roughly the same in increasing the hardness both before and after workhardening as carbon does. So in the parts of swords or knives that are not hardened, using phosphorous iron does the same as steel. As steel was expensive and hard to come by, it makes sense to use phosporous iron instead in thick parts that don't get hardened in quenching, so you get the same bending strength.
Phosporous can be removed by roasting ore before it's being smelted. This basically means burning everything off that can be burned off in an oxydizing fire. After you already have iron, I suppose the only way to remove it is through the Bessemer process, by melting it and blasting oxygen through the liquid iron.
Jeroen Zuiderwijk
- Bronze age living history in the Netherlands
- Barbarian metalworking
- Museum photos
- Zip-file with information about saxes
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Jeff Pringle
Industry Professional
Location: Oakland, CA Joined: 19 Nov 2005
Posts: 145
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| Posted: Sat 23 Jan, 2010 6:09 am Post subject: |
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Roasting the ore only removes sulfur, people didn't understand how to remove phosphorus until very recently, mid to late 1800s IIRC. 
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Jeroen Zuiderwijk
Industry Professional
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