stainless steels
stainless steels
(OP)
I woud like to know if we can use 304 stainless steel instead of 409 in 700 centigrade degree.
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RE: stainless steels
Any more info?
RE: stainless steels
RE: stainless steels
RE: stainless steels
I believe the max temp of 925C referenced in ASM is with respect to usable mecahnical properties without respect to corrosion resistance. This does not sound like a good application for 304 S.S.
Hope this helps.
RE: stainless steels
I wouldn't be a fan of using 409 at that temp. Have you done it? Does it work? Why do you want to change?
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: stainless steels
RE: stainless steels
RE: stainless steels
I have seen units that are cold every night and used for max power every morning and afternoon. These tend to have more severe cyclic oxidation issues.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: stainless steels
RE: stainless steels
RE: stainless steels
What is the allowable stress in your design? How can you assure the use of 304SS?
RE: stainless steels
RE: stainless steels
RE: stainless steels
RE: stainless steels
*IF* 409 ss is OK for your particular application, then 304 should do fine. Keep in mind that 409 is just about the cheapest grade that can be called "stainless"--it has just enough Cr and nothing else in it.
RE: stainless steels
I heat treat 305series stainless steel the parts are quite small approx 0.2500 squares x 0.017 thick, my problem is that they stick (fuse) to each other.
I use a temperature of 1850f and a hydrogen atmosphere (9999% pure) the same problem accurse using a vacuum furnace.
I understand way the SS sticks but cant help put think that there’s a cure for this.
I have tried mixed percentages of atmospheres such as Nitrogen and Argon blended
with H2 but this only creates a discoloration that cant be tolerated, I have also tried with some success Aluminum Oxide power but this Alo2 tends to embed itself in the base material and this is another problem.
I have been in the heat treat industry for over 35 years and have not solved this one yet.
Comments from readers are welcomed.
RE: stainless steels
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: stainless steels
I run LPC and SEM and show a small level of particals remainimg that will effect the parts performance I refer to them as hard particals that can disloge while the part is in servive, this micro partical will damage the machine.
Im not at liberty to reveal the machines function but I have spent years looking for the solution that will allow me to anneal this material approx ~1mil per day and yield no sintering effect.
Thanks.
RE: stainless steels
This fiberfrax came in sheets about 1/32" thick in a clothlike form in a random pressed condition. I seem to recall that in some intances there was some slight adherance of particles to the metal. This material might no longer be available because I believe it is made of asbestos type material.
Other times we used another product also a woven clothlike material that was more glossy (the fiberfrax was dull matt-like finish). The shiny material I think is fiberglass and was thicker (about 3/32")than than fiberfrax.
RE: stainless steels
Fiberfrax Refractory Ceramic Fiber - Fiberfrax High Temperature ...
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Fiberfrax Papers & Felts