Question about heat treatment holding time
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I’m seeking advice from experts: our facility has a low-temperature plate equipment unit that needs to undergo overall heat treatment. Among the components, there is a tube sheet made of S31603 with a dimension of 190 mm, and this tube sheet also needs to be heat-treated. However, the standards state that heat treatment is neither required nor prohibited for this material. Do I still need to take this material into consideration when carrying out the overall heat treatment? The device is of type 09mnnidr 26mm; how long does it take to insulate it? Thank you
For this, the GB/T30583-2014 standard can be referred to. This is a fixed-tube-sheet heat exchanger, right? Personally, I think it can be carried out in stages: first handle those parts that require heat treatment, and then assemble them with the tube sheet later, trying to avoid exposing stainless steel to heat treatment as much as possible.
But the workers in our unit have already assembled all the equipment. The manager wants to carry out the process as a whole, so how should the temperature and time be determined?
It is necessary to consider the impact of heat treatment on pipe fittings, as well as the effect of heat treatment on the intergranular corrosion resistance of the stainless steel material used in pipe sheets.
The tube sheet is a grade 3 forged piece of S31603 with a size of 190 mm, and it is welded in place. The cylinder head is made of 09MnNiDR low-temperature steel, with the thickest portion being 26 mm. What should be the appropriate insulation time in this case?
I took a look at the drawings; it’s a welded assembly, so heat treatment can only be done as a whole
It is extremely dangerous to heat-treat this stainless steel tube sheet, heat exchange tubes, and low-temperature steel cylinder together; careful consideration must be given to the rationality of the design as well as the sequence of manufacturing, welding, and heat treatment.
It is extremely dangerous to heat-treat this stainless steel tube sheet, heat exchange tubes, and low-temperature steel cylinder together; careful consideration must be given to the rationality of the design as well as the sequence of manufacturing, welding, and heat treatment.
Our company can supply 09MNNIDR sheets. May I ask more about it?
Let’s ask the designer again to see if it’s possible to do them separately
Hello, we inquired whether the design can be carried out separately. This is the first time our company is working on equipment for low-temperature panels, and we would like to ask what are the typical heating temperatures and holding times for 20-mm-thick low-temperature panel shells and end caps, and what are the corresponding values for 28-mm-thick shells and end caps?