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Subject: Tapping from EAF

Date: 12/08/00 at 3:52 PM
Posted by: Saltem
E-mail: saltem@iol.it
Message Posted:

In our steel shop there are 2 different opinions about the order of
the alloy adding during tapping.
we have about 500ppm of O in the EAF before tapping.
The first opinion is to add first of all Al to deoxidate because in
this way we form Al2O3 of big dimension that easly goes into the slag,
The second opinion is to add first Carbon (at the very start up of the
tapping) so to have carbodeoxidation and to reach a % of C near to the
aim of LF(that means a recarburation from 0 to 0,40% max) and then add
Al to ending the deoxidation. In this second way we form a less amount
of al203 (and so the steel should be cleaner) and the al2o3 formed is
anyway of big dimension because the new steel that is tapped in the
ladle is rich of oxigen.
What do you think about?
The problem is if
it is better to deoxidy with Al *before* adding carbon or to add
carbon (with care... of course) and then Al: in this second way we
think that we have less amount of Al2O3 and so a cleaner steel.
Our primary goal is to have the less amount of microinclusions in the
steel.

Sorry for my bad english

saltem


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