Regarding intergranular corrosion experiments
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What is the purpose of intergranular corrosion experiments? Is it to check whether the purchased raw materials are of qualified quality? In the design, the material grade has already been selected, yet this inspection requirement is still proposed. If this experiment fails, does it mean I need to use a different grade of material? Or change the manufacturer of the raw materials? I appreciate your advice!
An accelerated metal corrosion test method for evaluating the intergranular corrosion sensitivity of metal materials under specific medium conditions, aimed at determining whether the material’s chemical composition, heat treatment, and processing techniques are appropriate. If the retest fails, different batch numbers of material must be selected and the process repeated
The purpose of intergranular corrosion testing is to evaluate the susceptibility of pressure vessels to intergranular corrosion. Once it is confirmed that the vessels meet the required standards, it can be predicted that they will not suffer from unintended intergranular corrosion failures during long-term operation in media conditions conducive to such corrosion. For the details of the rest, refer to GB/T21433-2008; it is available on this forum. It should be noted that steels and welding materials of the same grade cannot be considered to have the same chemical composition; only steels and welding materials from the same batch (melting batch) can be assumed to have the same chemical composition. Therefore, whether it is qualified or not depends on the quality of this batch number as well as past experience with using similar materials. It would be best if experts on the forum could add some details.
GBT 21433-2008 \"Inspection for intergranular corrosion sensitivity of stainless steel pressure vessels\" – take a look at this standard.