Problems associated with the installation of large thin-walled stainless steel towers
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For large-scale thin-walled stainless steel equipment, when shaft-type lugs are used, the shell thickness is not sufficient to meet the requirements; therefore, our company opts to wrap a cylinder around the outer wall of the shell and then weld the shaft to it. There are two opinions regarding the material of this wrapping cylinder: 1) It should be made of the same stainless steel as the base material, as using carbon steel would contaminate the stainless steel and affect the strength of the shell. 2. Carbon steel can be used; it serves only a reinforcing purpose, and its principle is the same as that of the stainless steel composite panels we use. What are your thoughts on these two opinions? Experts are welcome to discuss
If we do it in the same way as the base material, it will look ugly if carbon steel is wrapped around the stainless steel; the customer won’t agree to that
Which of the two explanations is more reasonable from a theoretical perspective?
A single layer of plate is welded around the entire circumference, using the same material as the cylinder. Using carbon steel is unreasonable.
This approach is not in line with HG/T21574; how can local stresses in the cylinder be evaluated?
It is recommended to use the same material as the base metal; otherwise, potential corrosion may occur, affecting the service life of the equipment. =