Vacuum degassed vs fully killed steel
Vacuum degassed vs fully killed steel
(OP)
What is the difference between vacuum degassed steel and fully killed steel? We have asked for fully killed steel and have been offered vacuum degassed instead. This is for SA516-70N in sour service.
Thanks.
Thanks.





RE: Vacuum degassed vs fully killed steel
RE: Vacuum degassed vs fully killed steel
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RE: Vacuum degassed vs fully killed steel
Fully killed steel, as stated, is steel that has been deoxidized using either Al or Si. The deoxidant (Al or Si will create oxides that will for the most part float into the slag, but some residual non-metallics will definitely remain in the final product as inclusions and affect the cleanliness. This prevents blowholes/porosity from forming during solidification due to the low solubility of oxygen in solid steel.
Degassin a fully killed steel (a combination of both) will aid in removal of the deoxidation product and can aid in obtaining excellent cleanliness as well as low dissolved gas content.
RE: Vacuum degassed vs fully killed steel
RE: Vacuum degassed vs fully killed steel
RE: Vacuum degassed vs fully killed steel