hvn83The post #4 by JamesKelly mentions Temperature suitability
[quote]Almost all “304” plate is dual certified. It may be 0.03 max carbon stuff dual certified 304L/304. This, meanins it has decent corrosion resistance as-welded and the tensile & yield properties of 304, at least near room temperature.1150F is in the creep range, for which you need dual certified 304/304H. This has a minimum of 0.04% carbon for strength, plus I think both grain size and minimum annealing temperatures. It is widely available.Dual certification is the common practice. The mill does not want to melt two or three different chemistries, i.e. 304L, 304 and 304H so they make two different chemistries do the work of these three. It is the magic of precise chemistry control by refining the melt in an Argon-Oxygen Decarburization vessel, where a little nitrogen brings up the yield strength of 304L to the requirements of 304. Great for room temperature but the dual-certified “L”grade is not usually considered strong enough for use in the creep-limited range.Clear as mud?
If you go by this post then you should avoid using Dual Certified Steel (L) at higher temperatures and should go for the other Dual Certified Steel(H).
See if this is of any help![/quote]
Thanks again for the explanation, but it still ist an answer to my question (I believe).
I’m talking specifically about the 0 deg C – 425 deg C (~ 842 F) temperature range, which is below the range mentioned in your last post.
Second, I’m dealing with flanges, not with plates.
See the corresponding ASTM and especially the ASME B16.5 design notes; then you’ll understand where my question comes from.
Briefly; 304L flanges may only operate up to 425 deg C (per ASME B16.5).
So, may 304/304L flanges (say 150 lbs) operate up to 538 deg C then?
Why or why not?