Do all pressure vessels that undergo heat treatment require welding test plates?
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Do all pressure vessels that undergo heat treatment require welding test plates? For materials such as 12Cr2Mo1R, overall heat treatment is required according to GB150; does this mean that welding specimens must necessarily be prepared?
It depends on the situation. First, you need to distinguish between the base metal heat treatment specimens and the product welding specimens. For example, tube box heat treatment does not require the preparation of welded specimens.
Heat treatment falls into three categories: improving the mechanical properties of materials； Restoring the mechanical properties of materials ； Stress-relieving. For the first two types, welding test plates are required, while stress-relief heat treatment does not require welding test plates.
CrMo steel should require the production of test plates.
Let’s stick with 150-2011.
The conditions for preparing welded test pieces are specified in GB/T150-2011, page 333, clause 9.1.1.1
Is stress-relief heat treatment not required for welding test plates?
It is not necessary to include it; follow GB150-2011 for specific requirements
That’s the verification test plate, right? There are clear specifications regarding the preparation of welding test plates – 150 units are required