Steel grade advice for high temp thread application
Steel grade advice for high temp thread application
(OP)
parameters: steel is reaching an estimated 800-1000F in a utility boiler... the part with the threads is about 2-3" long and sprays oil into the boiler, the threads are 1 1/4-12 NF class 1B threads and the threading is about 1/2" long
right now we are using 1144 stressproof steel because someone found that the chemistry of the competitor's steel was (in %)
.5C, 1.6Mn, .012P, .27S, .23Si, .03Cr, .02Ni, <.01Mo, .03Cu, <.01Pb, Balance Fe
Now they somehow from that figured that the steel was 1144 stressproof... I assumed they would also need a hardness test?
We tried stainless steel but it galled terribly I guess so they went to thie 1144 but I they are saying there is still a problem getting the threads apart after the parts are in service for a while. I think they are wanting to stay away from the stainless steel. Perhaps I can try stainless again if I can come up with some idea to make it work better.
Is there a material or material combination that I may want to look into that will not tend to seize up at the threads after being in service for extended amounts of time under these conditions? Perhaps the answer is more in the threading? Thanks for any input.
right now we are using 1144 stressproof steel because someone found that the chemistry of the competitor's steel was (in %)
.5C, 1.6Mn, .012P, .27S, .23Si, .03Cr, .02Ni, <.01Mo, .03Cu, <.01Pb, Balance Fe
Now they somehow from that figured that the steel was 1144 stressproof... I assumed they would also need a hardness test?
We tried stainless steel but it galled terribly I guess so they went to thie 1144 but I they are saying there is still a problem getting the threads apart after the parts are in service for a while. I think they are wanting to stay away from the stainless steel. Perhaps I can try stainless again if I can come up with some idea to make it work better.
Is there a material or material combination that I may want to look into that will not tend to seize up at the threads after being in service for extended amounts of time under these conditions? Perhaps the answer is more in the threading? Thanks for any input.





RE: Steel grade advice for high temp thread application
RE: Steel grade advice for high temp thread application
I will look into that b16 material
RE: Steel grade advice for high temp thread application
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RE: Steel grade advice for high temp thread application
One thing that might help is to take the tips of the threads off. Doing this will not take away the effectiveness of the thread sealing.
h
RE: Steel grade advice for high temp thread application
RE: Steel grade advice for high temp thread application
As has already been suggested, Knock off the thread tips and use a Ni anti-seize.
Also look at coarser threads, they will be more robust.
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Plymouth Tube
RE: Steel grade advice for high temp thread application
RE: Steel grade advice for high temp thread application
EMJ is one supplier that offers a wide range of sizes of hot-rolled bars in grade B16 (ASTM A193). Use the following link for more information:
ht