Discuss again about the test board

I think this is a heat treatment issue. The heat treatment of pressure vessels is generally stress-relieving heat treatment. This temperature is lower than the lower transition temperature, so it does not have a great impact on the results of physical tests. This situation is only for multi-cavity vessels, such as tube boxes of heat exchangers.

Everything is the same, the difference is that one is heat treated and the other is not heat treated. What is the difference in the results of physical and chemical tests? Inform separately: What are the results of tensile, face bending, back bending, and impact test values? Going a step further, should the heat treatment be above the upper transition temperature, lower than the upper transition temperature, or somewhere in between? Please ask for advice from someone who has done physics and chemistry. (The material is 16MnR), so what about 304. What the person above said is right, most pressure vessels undergo post-weld stress relief heat treatment. Containers made of 16MnR steel plates require stress relief heat treatment when the diameter exceeds 38mm, which is equivalent to tempering when the temperature is lower than the lower transition temperature. The main function is to heat-treat the hardened structure in the joint to improve toughness. There is a situation where 16MnR is equivalent to normalizing treatment above the upper transition temperature in the container, which is the suppression of the head. If the head is spliced, this type of heat treatment welding evaluation must be done. As for the physical and chemical test results, there is not much difference, but the impact toughness should be better. As for 304, post-weld heat treatment is generally not performed because the sensitization temperature is difficult to control. Solution treatment can be done according to the drawing requirements, and the actual purpose is to fix C. The plasticity and corrosion resistance are improved, but the strength is reduced.