tundish cover powder?
tundish cover powder?
(OP)
hello everybody
i always read from forum pages but this is my first writing..
my question about tundish slag fluxes..in continues casting process for preventing corrosion of tundish plaster which type of slag flux should we use?
as far as i read from an article basic slag is the best for MgO base plasters..
any practical answers about usage of those materials would be great?
cem
i always read from forum pages but this is my first writing..
my question about tundish slag fluxes..in continues casting process for preventing corrosion of tundish plaster which type of slag flux should we use?
as far as i read from an article basic slag is the best for MgO base plasters..
any practical answers about usage of those materials would be great?
cem





RE: tundish cover powder?
I've used products fro ZYP for some very high temperature molten refractory slag/glass problems. You might want to them a call.
http://www.zypcoatings.com/index.htm
RE: tundish cover powder?
Learn the rules,so you know how to break them properly.
Dalai Lama
_____________________________________
RE: tundish cover powder?
RE: tundish cover powder?
RE: tundish cover powder?
our carbon content is usually between 0,10- 0,25
recently we made some experiments i can also write about the slag analysis if somebody wants to talk about it..
i want to discuss about the results a little (if you see somethings wrong in this discussion directly correct me if its possible)
when no slag powder used, after 3 or 4 heat tundish created its own slag which was acidic (by the way we are not using shroud) and after 22 heat linings were cut..
then we used acidic powder we had a creamy slag under a brittle thin slag crust but again linings are not good after 22 heat..
with a high CaO content basic powder we can create a basic slag, and we observed that it was so good with catching non metallic inclusions and after 22 heat our linings was still in a good position..
but our problem with basic slag was it became solid very fastly and its quite hard to broke it for sampling..
as far as from my searchings fluidity of the slag is not related with acidity or basicity.. "Fluidity of slag comes from low melting point eutectics in CaO-Fe2O3 and CaO-FeO(about 1200 C) due to iron oxide on top of the steel melt."
so what should i add for fluidity..
should i throw some FeO powder on to slag or what?
RE: tundish cover powder?
RE: tundish cover powder?
Learn the rules,so you know how to break them properly.
Dalai Lama
_____________________________________
RE: tundish cover powder?
This comes from a long time ago.
Aren't some of the feldspar's used to flux slag?
RE: tundish cover powder?
Learn the rules,so you know how to break them properly.
Dalai Lama
_____________________________________
RE: tundish cover powder?
but adding of Feo into the slag will decrease content of these elements in the steel. Al203 will bock FNC nozles and you will have problems with casting. For me it is usefull to add fluspar CaF2, or SiCa prowder in order to reduce Fe0, Si02 will decrease melting temperature of cover slag.
RE: tundish cover powder?
Have you done an analysis on the ladle slag to compare its composition to the tundish slag.
arunmrao: flourospar is indeed used in many cases to help flux in the slag.
RE: tundish cover powder?
But it is almost impossible to give right advice over the net without knowing all the facts. There are at least 10 - 15 facts to be clearified before correct advice can be given.
For example: Type of steel cast, length of sequence, open cast or ladle shroud, quantity of carry over slag from ladle, thickness and composition of tundish spray. precise despriction of tundish cover (Rice Husk Ash?). Solutions depend on plant conditions. R u able to slag off, for example? I suggest you invite you supplier of tundish spray and/or cover for consulting. If they know there job, they should be able to make proper suggestions.