I am looking for potential for galvanic corrosion in an assembly consisting of super duplex 2507 on the one hand and several possible different alloys at the other. However, I am not able to find a galvanic series containing 2507 to estimate its position compared to other alloys. Is anyone...
Does IN 625 tubing that has been bright annealed (reducing hydrogen atmosphere) need to be pickled and passivated? The tubing conforms to ASTM B444.
My assumption is that in the absence of any scale, the tubing should be able to self passivate pretty uniformly. Is that reasonable?
Hi, I am looking for a way to measure grain size inside and outside of the heat affected zone in a Ti6Al4V product. Can I use the comparison method provided in ASTM E112? If Yes, which reference plate should I use? While there are clear instructions for Stainless steels, copper, aluminum...
Hi
I have a super duplex stainless steel tubing that I would like to test for toughness using Charpy Impact Testing. Because of the dimensions of the tubing, the sample cross section will have to be lower than what is recommended by ASTM. My understanding is the "absorbed energy" requirement...
Hi all,
Can 316L be laser welded to Hastelloy C-22? If yes, what filler alloy should be used, if at all, to make sure corrosion resistance of the weld zone is not an issue?
Thanks!
Hi,
I am new to the semiconductor industry. Hence the question. What is the reason behind the SEMI F20 standard (applicable to material used in Semiconductor Industry) recommends that the grain size of the material should be size 4 or finer? If the smaller grains size material meets the...
Hi all,
Over the last few years, I have come across some cases where some of the 316 material we use has failed ASTM A262 Practice A (Test for sensitization) but passed ASTM A262 Practice E testing. This material seems to also show a higher susceptibility to SCC. A common thread in all these...
Hi,
We have a spec that calls out for ASTM B446 passivation on IN-625 alloy. We recently changed our supplier and I realized that they only adhere to ASTM A380 and A967 for passivation. They refuse keeping to B446 standard. Can someone help me in informing what the differences are between...
Hi,
Can the welding of superduplex 2507 material with 6 Mo material be considered as an option? I am aware that 2507 can be a tricky thing to weld even on its own, but would welding with 254 SMO grade lead to potential corrosion or mechanical issues? Are there any precautions that one must keep...
I would like to be able to do ASTM G-36 (Test for evaluating SCC resistance of metals in boiling MgCl2 solution) test in-house. The test setup talks about a modified Allihn condenser along with a trap. Does anyone know where I can find these products? I am able to find the usual designs, but the...
Hi,
This is a question I have had for a while. I look at cracked 316L SS parts fairly frequently. Sometimes I notice that the cracked regions show elevated amounts of Oxygen and Chromium when conducting EDS analysis. This is when the analysis is done on metallurgical polished mounts.
Just...
Hi,
Does anyone have experience with cast Al 6061-T6 be used in natural gas environment with about 50 ppm H2S? If required we can have it Mil C 5541 surface treated. If not, what would be a better material choice?
Thanks
Is it possible to obtain a grain size of 2-4 (ASTM E112) in IN625 material using a Grade 1 annealing process? I am concerned that at Grade 1 temperatures, it would be hard to avoid recrystallization that would result in grain size reduction.
Does anyone have suggestions about what kind of paint would be useful to avoid dezincification of C360 grade brass in acidified salt spray environment?
Thanks
Is there a relationship between the dezincification resistance of C36000 (acidified salt spray environment) grade brass and its lead content? During my literature search, I have noticed conflicting opinions.
On a related issue, my understanding is that the corrosion resistance of this grade of...
