GB/T18442.2-2011 requires that the re-inspection of steel plates for inner containers include at least the following items
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According to GB/T18442.2-2011 6.2.3, the reinspection of the steel plates used for the inner containers shall include at least the following items: a) the surface quality and markings of each steel plate; b) the chemical composition of each batch of steel; c) the mechanical properties of each batch; d) the Charpy (V-notch) low-temperature impact test results at the design temperature. Note: When austenitic stainless steel plates are used at temperatures not lower than -196°C, a low-temperature impact test is not required. How should the phrase “re-inspection of the steel plates used for the inner container” be understood? Does it mean that all steel containers must be retested, or are there other standards that require testing before such inspections can be carried out? Let’s discuss it together and see how everyone understands it.
This requirement means that the steel plates used for the inner container must be re-inspected, with the inspection items carried out in accordance with standard specifications.
How should the phrase “re-inspection of the steel plates used for the inner container” be understood? I think that, as low-temperature cryogenic equipment, it usually consists of a double-tank structure, with the inner tank being the one that comes into direct contact with the medium; therefore, re-testing and inspecting the material of this inner tank is extremely important. In practical operation, when production is carried out in bulk, the stainless steel material used for the inner tank is more likely to be flat-rolled sheet; therefore, re-inspection is a necessary requirement for low-temperature cryogenic equipment.