Aluminum Killed and Vacuum Degassed

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scottsuperman Participant Join Date: Jun 2019 Posts: 2	Aluminum Killed and Vacuum Degassed 06/20/2019 2:17 PM
	Are these processes ever both done or is it only one or the other? From what I understand of it (through reading different papers and posts), they both accomplish the same thing but the Vacuum Degassed is a newer and more effective method. Thanks for your assistance!
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8778 Good Answers: 376	#1 Re: Aluminum Killed and Vacuum Degassed 06/20/2019 3:29 PM
	What process is this relating to? __________________ jack of all trades
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scottsuperman Participant Join Date: Jun 2019 Posts: 2	#2 In reply to #1 Re: Aluminum Killed and Vacuum Degassed 06/20/2019 3:34 PM
	Sorry. This is related to treatment of steel.
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33280 Good Answers: 1810	#3 Re: Aluminum Killed and Vacuum Degassed 06/20/2019 9:07 PM
	..."Vacuum degassing is used primarily for removal of hydrogen from steel. The liquid steel is exposed to an evacuated atmosphere for a period of time, typically reducing the hydrogen value to <2 ppm. 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. Degassing 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."... https://www.eng-tips.com/viewthread.cfm?qid=194837 __________________ All living things seek to control their own destiny....this is the purpose of life
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Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9742 Good Answers: 1119	#4 Re: Aluminum Killed and Vacuum Degassed 06/21/2019 4:35 PM
	Vacuum degassing is used to remove hydrogen. Killing is the addition of silicon or aluminum to remove carbon monoxide. Both remove gases that cause bubbles when the steel cools. (I believe degassing is not as effective at removing CO.) See Vacuum degassed vs fully killed steel . https://www.eng-tips.com/viewthread.cfm?qid=194837
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