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I am being asked about possible pairings of 2507 with 316/316L, 317, Nit 50 and other austenitic stainless steels. Based on your response, it seems that possible galvanic issues are likely, especially in seawater environment.

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...

Thanks as always EdStainless for your reply.

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...

Thanks for your responses. The testing was not for A923 compliance, but dictated by the application. Regardless, its very useful to know that a simple proportionality based on cross section area maybe good as a first pass, but we will need much more data to get a good correlation. I also like...

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...

Thanks MagBen, WKTaylor and EdStainless for your responses and help in this matter! Perhaps then it does seem it would be good if the ASTM A262 Practice E test should have a footnote or something that says that this test might be too severe for heavily cold worked material and therefore, in such...

Ed, Thank You. That could explain the phenomenon. The bars are cold drawn to the desired dimensions and mechanicals by our vendor at a draw shop. They claim the entire process is low T and thus should not cause sensitization. SO I guess in the cold drawn state, we should only look for acceptable...

Thanks Ed for the response. So just to clarify, you mean that if I have to check a cold worked 316 for intergranular corrosion susceptibility, I should stick to only Practice A and not necessarily Practice E? In other words, as long as the cold worked material passes Practice A and its prior...

Wow, I asked the question just 2.5 months ago on this thread and now I have a real twister. We just received a test report saying that the material exhibited Step Structure in Practice A (ASTM A262) but when the lab conducted Practice E test, the material failed. This is a heavily cold drawn 316...

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!

Dalinus, I appreciate you checking. I do understand the relationship between grain size and grain size number.

Thanks MagBen!

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...

Thanks Racookpe1978, EdStainless and MagBen!

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...

Thanks Pradip. Your article was very informative. EdStainless - Your advice agrees with the paper and the link provided. Thanks.

Great. Thanks a lot Metengr and EdStainless!