Discussion questions regarding the heat treatment verification test plates
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Taking the head made of 09MnNiDR material as an example: for the standard elliptical head EHA4200×40(39.7), the thickness of the 09MnNiDR material used is 46 mm. The supply condition is \"positive + reverse\", and after hot pressing, in order to maintain this supply condition, a \"positive + reverse\" treatment is required, along with heat-treated test plates for verification. What are the minimum necessary testing items that need to be performed on the verification test plates in order to effectively prove that a \"forward + reverse\" treatment has been carried out, ensuring the proper condition of the material supplied? Friends are welcome to share their opinions; it would be best if they could provide evidence. It should be noted that only the minimum, most necessary, and most effective testing procedures will be carried out. We conducted normal-temperature stretching, cold bending, and low-temperature impact testing – can these three tests effectively ensure the validity of the verification (on the premise that all other relevant tests have already been carried out on the material upon its arrival at the factory)?
Is it clear now with these 9.2 to 9.5?
Most of your materials are low-temperature containers; the specimens should be prepared by combining them according to standard 9.5, and then followed by standard 47016. Is there any problem with that?
The test specimens were taken from the weld joint and the base metal
If no merger, then follow 9.2.3
Additionally, if the device is designed according to 4732, then it should comply with the requirements specified in 4732
The qualification requirements are specified in the design documents. Moreover, what is stated in the question is not quite correct; there are no specific minimum inspections required – it is sufficient to meet the design standards and the design documents. In other words, the minimum requirement is simply to comply with the design standards and design documents. Without referring to the design documents, this topic is not easy to discuss
After the head is formed, normalizing followed by tempering is carried out. There is one issue: when the head is welded to the cylinder, the material condition at the joint area changes, and the same thing happens at the welds where the head is connected to the nozzles. Regarding the overall post-weld heat treatment of the equipment, there is actually also a performance-restoring heat treatment. The total number of heat treatment cycles for a component should be carefully considered……