Deoxidation for duplex stainless steel
Deoxidation for duplex stainless steel
(OP)
What is the best deoxidation for duplex stainless steel? And the risering? Is there a formule to calculares the risering for This kind of steel?
Thanks in advance.
Jandyr 13 Foundry
Thanks in advance.
Jandyr 13 Foundry





RE: Deoxidation for duplex stainless steel
Have you seen this-
http://ww
Risers are probably not relevant.
RE: Deoxidation for duplex stainless steel
Whit the balance of chemical composition we have no problem. The ferrite number is ok and the structure is almost 50/50. The PREN is ok too.
The only problem is porosity and skrinage.
RE: Deoxidation for duplex stainless steel
What are you starting with? AOD refined ingot or are you alloying up stainless plate? What was your nitrogen content.
Always start with a hot furnace. Wash out before hand with a stainless heat so the furnace and ladle are good and hot. Don't hold the heat in the furnace longer than necessary. Pouring temperature should be as low as you can and still pour a good casting. The furnace should be tapped at a temperature where the metal is ready to pour when it reaches the floor without waiting too long. Duplex is really not that much different than CF8M otherwise.
Bob
RE: Deoxidation for duplex stainless steel
regarding riser selection,use good quality sleeves from Foseco.
How are you adding Nitrogen? Is it with Nitrogen containing L.C.FeCr?
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RE: Deoxidation for duplex stainless steel
The alloy are CD3MN and CE3MN.
The nitrogen content is .19 and it's adding whit Iron Chromiun Nitro during the melting.
I use magmasoftware to calculate the risering sistem but doesn't work. I concluded that the módulus of sleeves must be the doble than the others alloys.
The deoxidation is a bit of Al, FeSiZr, CaSiMn, Mish, NiMG, Ti and Se. Is there difference to use the deoxidants at ladle instead during the tapping.
A lot of thanks