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See Chinese contents: GB/T 9444-2019 GB/T 9444-2019: Steel and iron castings -- Magnetic particle inspection
This standard specifies the general requirements, acceptance criteria, indicated grading and evaluation, re-inspection, inspection records and reports, etc., for magnetic particle inspection of steel and iron castings. This standard is applicable to magnetic particle inspection of surface and near-surface defects in ferromagnetic iron and steel castings.
