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See Chinese contents: NB/T 47013.12-2015 NB/T 47013.12-2015: Nondestructive testing of pressure equipment - Part 12: Magnetic fiux leakage testing
This Part of NB/T 47013 specifies the magnetic flux leakage testing and result evaluation method for pressure equipment made of ferromagnetic materials, seamless steels pipe and welded pipe (excluding submerged arc welding).
