The cylinder of high-pressure equipment is made of 36mm Q345R steel plate – is normalizing required?
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The cylinders of high-pressure equipment are made of 36mm Q345R steel plates; if the design temperature is set at 100°C and the medium is nitrogen, is it necessary to normalize the steel plates?
In principle, it bypasses the requirement of 4.1.4 in Part 2 of GB/T150, which states that normalizing is not necessary； It’s better to be cautious when using it in practice.
Based on the material properties of Q345R steel, a 36-mm-thick Q345R steel plate does not generally require normalizing treatment at a design temperature of 100°C in an environment of nitrogen. However, whether normalizing is actually necessary depends on the specific requirements of the equipment and its operating environment. It is recommended that you consult relevant professionals or refer to relevant standards to make a decision. .
It’s at the edge; if the pressure is high, it’s better to specify delivery in a normalized state.
It is usually normalized; if not, please have the design unit indicate it on the drawings.
Source: www.autopv.cn, Professional intelligent Q&A on pressure vessels
According to the standard, 36mm thicknesses do not require normalizing, but heat treatment after welding is also a problem in your case. Personally, I think it’s sufficient to choose either normalizing the plate or post-weld heat treatment
The standard represents the minimum requirement; the thickness corresponds to the standard edge thickness. This equipment is a high-pressure device, and it is best to use Q345R material for the cylinder, with normalizing being the appropriate treatment.