304L VIM/VAR
304L VIM/VAR
(OP)
what 304L VIM/VAR stands for ?
does it mean 304L went thru VacuumInductionMelt and then went thru VacuumArcRemelting ? double melting ?
I could not find a source.
thanks.
does it mean 304L went thru VacuumInductionMelt and then went thru VacuumArcRemelting ? double melting ?
I could not find a source.
thanks.





RE: 304L VIM/VAR
but what AMS spec?
thanks.
RE: 304L VIM/VAR
So you get VIM/VAR, AOD/ESR, and half dozen other combinations. These are done for internal cleanliness reasons.
This type of material is covered in a number of ASTM F specs for medical device applications.
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P.E. Metallurgy, Plymouth Tube
RE: 304L VIM/VAR
anyone has a spec?
thanks.
RE: 304L VIM/VAR
Why would you want it?
There are better alloys depending on what your concerns are.
And they are already produced as remelted.
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P.E. Metallurgy, Plymouth Tube
RE: 304L VIM/VAR
thanks.
RE: 304L VIM/VAR
Today's AOD material is much cleaner than steels 40 years ago
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P.E. Metallurgy, Plymouth Tube
RE: 304L VIM/VAR
RE: 304L VIM/VAR
VIM is very expensive since all virgin feedstock is used. Since there is no way to remove carbon or adjust the chemistry. VIM heats also tend to be small and have greater chemistry variation from heat to heat.
I hope that their spec refers either to the ASTM or ISO inclusion rating specs. You can get any reputable testing lab to do this for you.
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P.E. Metallurgy, Plymouth Tube
RE: 304L VIM/VAR
Normally static cast, concast is sufficient. Arc+VAR or ARC+ESR is better. VIM/VAR is superior. Carpenter even uses triple melting VIM+ESR+VAR for lots of aerospace applications (not for 304L)
RE: 304L VIM/VAR
thanks.
RE: 304L VIM/VAR
We have looked at heats melted various ways. We have no difference in inclusion ratings. The EAF-AOD/ESR material is as clean as any other. The triple melt was no better in the alloy that we were looking at. I will add that our alloy has a nitrogen content of 0.35-0.40% that is critical. This pretty much eliminates VAR as an option.
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P.E. Metallurgy, Plymouth Tube
RE: 304L VIM/VAR
RE: 304L VIM/VAR
There are ASTM F specs for high cleanliness 316L and a few Ni and Co alloys that are used for medical implants.
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P.E. Metallurgy, Plymouth Tube