How are the heat treatment parameters for surfacing the heat exchanger tube sheet determined?
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Our company has a project involving cladding of tube sheets; the tube sheets are made of 20MnMoIII, with S30403 used for cladding. The thickness of the base layer is 258 mm, while the thickness of the cladding layer is 8 mm. Heat treatment after surfacing is required. How should the heat treatment temperature be determined under such circumstances? Heat treatment holding time? Heating rate? Cooling rate? What is the basis?
Take a look at NB/T47015
There is nothing like what I mentioned in 47015.
GB/T150 specifies that for dissimilar steels, the more stringent requirements shall be followed. That is, it comes from 20MnMo. NB/T 47015: 600℃, minimum 20 minutes. But the risk is a bit high. . Anyway, the experts are all confused; no one knows what to do