Issues with retesting of materials
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Most of the flat panels in circulation on the market require retesting of the materials. Is the reinspection required for each steel plate or for each batch of steel plates from the same furnace? Does the retesting requirement be qualitative or quantitative? For example, in the case of flat stainless steel sheets made of 304 material, does retesting only need to determine whether it is indeed 304, or is it necessary to provide the specific percentage levels of the various chemical elements present? Also, how can the corrosion resistance of stainless steel be retested? How are retest reports issued, and is it valid to conduct internal retests within an organization and issue a report based on those tests? Thank you. . .
Specific details can be determined through negotiation between the buyer and seller
It’s not easy to explain this stuff. I don’t know what purpose the material is being used for, what kind of equipment it will be part of, nor do I know what standards need to be followed. I also don’t know the application environment, the medium involved, or the manufacturing processes – so how can I explain it properly? Hehe. In fact, there should be standards for these things; you can take a look at ASME’s material requirements as a reference. If your organization has the necessary capabilities to produce it itself, then you can do so, but you’ll have to be responsible for your own reports.:lol Re-inspection isn’t just about confirming the material; information on its chemical composition and physical properties is also required, depending on the requirements of the equipment you’re trying to create.
Re-inspection for flat sheets: One roll can be considered as one sheet, but the relevant verification procedures must be in order； The chemical composition is specified per furnace, while the mechanical properties are specified per batch; quantitatively, the specific percentage contents of the respective elements in the chemical composition as well as the exact values of the mechanical properties must be provided ； The corrosion resistance of stainless steel is retested in accordance with GB/T4334 ； The retesting report is issued by the entity that commissioned the retest; if the entity possesses the necessary qualifications for retesting, it can conduct the retest and issue a report, with the conclusions being valid.