Regarding heat treatment
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Please advise: Does a Class 2 vessel made of Q245R material with a thickness of 26 mm require post-weld heat treatment? When is heat treatment necessary?
It is definitely necessary to carry out post-weld stress-relief heat treatment.
It depends on the specific operating conditions of the container. If GB150 provides specific requirements, heat treatment may not be necessary if only the thickness is considered; instead, factors such as the toxicity of the medium and hydrogen sulfide stress corrosion need to be taken into account.
Welding heat treatment is necessary in cases of stress corrosion; it is essential for situations involving extreme or high levels of risk.
Q245R is the carbon steel specified in Table 5 of GB150.4. Whether post-weld heat treatment is required depends on whether the medium is highly toxic and whether it involves low-temperature equipment; specific details can be found in the sections on post-weld heat treatment in GB150 or JB4732. Chapter 7.8 of HG/T 20581-2011 \"Specifications for Material Selection of Steel Chemical Process Vessels\" – Restrictions on the media used – specifies various conditions that require post-weld heat treatment.
Not necessarily! It can only be determined in combination with other conditions.
It depends. Just looking at the thickness, it’s not necessary. Look at the medium again, as well as the deformation rate and the amount of thinning. Refer to TSG3.2.11 and 4.2.6, GB150
Whether heat treatment is necessary depends not only on the material and thickness
Yes, it depends on what medium is contained in the container According to GB150.2, heat treatment is required for thicknesses exceeding a certain value. A thickness of simply 24 does not require heat treatment.
Thank you all for your participation and guidance. The media of this equipment are oil and gas along with catalysts, presenting a moderate level of hazard.