This national standard specifies the general requirements of magnetic particle inspection of steel casting, personnel qualification, equipment and facilities, detection method, quality grade evaluation and/or preparation of flaw detection report.
This national standard is applicable to the examination and quality rating of cast surface and/or near surface flaw of magnetized steel. When the magnetic field intensity is equal to 2.4kA/m, the cast steel in the materials whose magnetic induction is greater than 1T is called magnetized steel.
1. Subject content and application scope
2. Reference standard
3. General requirements
4. Qualification of personnel
5 Flaw-detecting apparatus
5.1 Equipment
5.2 Magnetic powder
5.3 Magnetic suspension liquid
5.4 Standard test block
6 Testing method
6.1 Preparation
6.2 Magnetization
6.3 Display
6.4 Observation
6.5 Demagnetization
7. Quality grade
7.1 Application of quality grade
7.2 Defect type
7.3 Evaluation
7.3.1 Evaluation frame
7.3.2 Defects that are not taken into account
7.3.3 Demarcation of quality grade
7.3.4 Rating of non-linear defects
7.3.5 Rating of linear defect and dotted line defects
7.3.6 Change of the evaluation frame during the utility
7.3.7 Total length of defects and the conversion of total area
7.4 Record of defects
8 Flaw detection report
