Steel plates used in the manufacture of gas storage tanks of the third category must be reinspected, and what should be included in the re-inspection contents.

Re-inspection at least include:
1. One by one inspection of steel surface quality and material signs
2. According to the furnace re-examination of the chemical composition of the plate
3. By re-examination of the mechanical properties of steel, cold bending performance;
4. Carbon steel and low-alloy steel plates for the manufacture of pressure vessel casings are required to be ultrasonically inspected.
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Source: https://www.dfc-tank.com/news/when-re-inspect-the-steel-plates-you-need-know.html