Seek advice on the annealing treatment process for 09MnNiDR after two revisions
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The company is manufacturing low-temperature equipment, and it is necessary to carry out post-weld heat treatment on the test pieces. A heat treatment process after two revisions also needs to be prepared. Are the temperature and holding time for this heat treatment process after two revisions the same as those for the process without any revisions? Thank you
The annealing after welding was already done previously; should it be carried out again after repair, with the same temperature and time? Does it also have an impact on the mechanical properties of the test plates? Is it not necessary to make any changes to the temperature and time?
It should be appropriate to carry out annealing after simulated welding, and then perform repair work followed by another annealing process – such is the proper heat treatment approach
It involves making several welding test plates of different thicknesses, then performing heat treatment after the first revision, and further heat treatment after the second revision. So I wonder whether the temperature and holding time for the heat treatment after revisions are the same as those for the heat treatment of the test plates without any revisions
It’s the same; there’s no difference. The key is that the final test specimen passes the evaluation.
The test specimen only requires one heat treatment; why is two heat treatments necessary?
So they require that the welded test piece be heat-treated once, and then they pretend that the piece needs to be reworked due to welding defects and is heat-treated again; in other words, one welding test plate undergoes two heat-treatment processes. I would like to ask whether the temperature and duration of these two heat treatments are the same
If it is pretended that the pressure test or flaw detection after one heat treatment fails, and repair is carried out before another heat treatment, are the time and temperature of those two heat treatments the same? I’ve never done this before; it’s my first time :(
The temperature is the same; the total constant-temperature time has doubled
This situation can occur: defects are detected after heat treatment of the equipment, and another heat treatment is required; it is therefore necessary to use such simulation specimens.