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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Ductile Iron + Casting....
If I melt down a ductile iron pipe for casting, will it still be
ductile iron upon cooling, or will whatever is used to nodulize the graphite burn off? Or is there a specific cooling protocol to follow for ductile? Thanks! |
#2
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Ductile Iron + Casting....
"dan *5" wrote in message ... If I melt down a ductile iron pipe for casting, will it still be ductile iron upon cooling, or will whatever is used to nodulize the graphite burn off? Or is there a specific cooling protocol to follow for ductile? Thanks! It is unlikely that you'll end up with ductile, especially if you melt in a crucible. Once gray iron (low in sulfur only) is inoculated, there is a brief period where the material forms the spheres of graphite. By the time you have reheated the material, the magnesium that is responsible for the conversion will have long since been burned away. You will end up with gray iron if you're lucky, and white if not. A lot depends on the method of melting. An induction furnace is ideal, a cupola only if you either use sulfur free coke, or introduce calcium carbide to the molten iron just before inoculation. The calcium carbide will combine with the sulfur, reducing it to an acceptable level. Otherwise, the inoculation isn't likely to be successful. Harold |
#3
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Ductile Iron + Casting....
On Nov 30, 4:13*am, "Harold and Susan Vordos" wrote:
"dan *5" wrote in message If I melt down a ductile iron pipe for casting, will it still be ductile iron upon cooling,... It is unlikely that you'll end up with ductile, especially if you melt in a crucible.... Harold http://www.ductile.org/didata/Section7/7intro.htm Malleable iron; http://steel.keytometals.com/Articles/Art121.htm I think there is a simpler, older process where the castings are cooked at red heat for a week. The iron in my old wood stove machines quite well. |
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