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Thanks Metengr, much appreciated. wsu1975, I completely agree with you that IF I was designing components to this specification then I should have every piece of this specification. I totally, completely, 100% agree with you. I originally stated that a customer drawing had these requirements...

Thanks everyone. So I understand that the Code Case has no impact on the material specification. BUT, if this code case has test requirements that the material must pass, for example if it states that tensile tests on the material shall show a strength above XX ksi. It would be an additional...

Hello everyone. I hope someone can help me out. I've got a customer drawing of a part that states in the notes: 1) Material, fabrication, and examination to be in accordance with ASME boiler and pressure vessel code section III division 1, subsection NF for a class 1 linear support. 2) material...

DVD, good call on the oxygen. No worries there, we've got the chamber in a giant warehouse with climate control. Moving air and the percentage of CO2 would be extremely low. As far as calibration of the chamber. This chamber is just for low temperature soaks. Our PID controllers and fan...

Thanks for all the responses guys. I guess the system is not "air tight", I mean every opening is sealed but I'm sure that it isn't hermetic. We are not building up any pressure... The chambers start off with ambient air. The ratio of dry ice to volume is 1:3. I think I may have found a...

racoope1978 - What temperature are you able to get the air to in your setup with the pelletized ice?

Thanks guys. We've got a solenoid operated valve for a liquid nitrogen tank somewhere.... Definitely thinking I'm going to have to go that route. btrueblood - The first chamber is loaded with dry ice, we tried maximizing the surface area, leaving airflow space around each stack of blocks...

I've got an insulated 2 Part ev chamber. One part of the chamber holds many blocks of dry ice, the other part holds the test specimen to be cooled. 2 insulated ducts with fans push and pull air through the chambers circulating the cold air. After a day of circulating the cold air the AIR...

Hey everyone, got a question regarding the shear strength of 316 Stainless Steel. I have a design that utilizes a punch press of sorts. Basically it is a load limiting device that breaks at a certain load. The loads are quite high and the parts are huge so the shearing "plates" have a radial...

Thanks for the input guys.

IRstuff, your right, I was just curious as to this materials properties. I had never heard of it before. I'm specifying the PEEK mainly because it's one of the few structural plastics that can be used in radiation environments. Perhaps PAEK is also radiation tolerant? I don't have the ASTM...

Can't believe I forgot to add this to my original question, the PAEK is per ASTM D-6262

Right, of course. I probably should have mentioned what I asked our purchasing department to get quoted. I asked for PEEK per MIL-P-46183 type 1. I believe a supplier suggested the PAEK as an alternative because it was over run that they had on hand.

Hello all, I have a large diameter part that needs to be made from PEEK (Temperature, radiation environment) and our purchasing department came back with several quotes, one was for 6" diameter x 3" lg "pucks" of PAEK material. What I've been able to find out online is that PAEK was the...

So the Zirconia is a coating? Interesting...

Thanks for the responses. lganga: the bracket actually attaches a damper to the vessel. 17-4 was chosen for the needed strength at the pin connection. I'm going to look for some more information on Zirconia. I'm hoping to find a material that could be milled to the fit the bracket w/bolt...

Hello all, I've got an application where a connection needs to be made to a component that is at 700°F. I'm looking for a barrier material that with a low conductivity that is also able to withstand the bearing loads applied. Basically a bracket made from 17-4PH stainless will be bolted to...

Thanks, my question has been answered!

Thanks for the info. So if I was to get a block of 7075 in the -O temper and then forge it into shape. Could I then specify it to be tempered to T7351? I've heard of some tempers requiring compression stress relief, not really sure what is involved with that. I like the T7351 temper because of...

Can 7075-T7351 aluminum be forged? I haven't found any literature that specifically says that it can't. Does anybody have any experience with this? If it can not be forged is there a suitable temper in 7075 that can be? Thanks for your input.