ISO 4986:2020
Steel and iron castings — Magnetic particle testing
This document specifies a method for the magnetic particle testing of ferro-magnetic steel and iron castings.
It also gives acceptance criteria through severity levels defined by the nature, the area and the dimensions of the discontinuities present.
This document is applicable to all ferro-magnetic castings, independent of the moulding method.
A steel and iron casting is considered to be ferro-magnetic if the magnetic induction is greater than 1 T (Tesla) for a magnetic field strength of 2,4 kA/m.
This document only applies to those areas of the castings specified for testing, as well as the percentage of castings to be tested.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Ordering information
5 Testing
5.1 Operating mode
5.2 Qualification of the operators
5.3 Surface preparation
5.4 Conditions of testing
6 Acceptance criteria
6.1 Definition of magnetic particle testing indications
6.1.1 General
6.1.2 Non-linear indications (SM)
6.1.3 Linear indications (LM) and aligned indications (AM)
6.2 Severity levels
6.2.1 General
6.2.2 Non-linear indications
6.2.3 Linear and aligned indications
6.2.4 Selection of the severity level
6.2.5 Designation of severity levels
7 Classification of the indications and interpretation of results
7.1 Classification of the indications using Tables 1 and 2
7.1.1 General
7.1.2 Non-linear indications
7.1.3 Linear and aligned indications
7.2 Interpretation of results
8 Cleaning after examination and demagnetization
9 Test report
Annex A (informative) Recommended surface finish for magnetic particle testing
Annex B (informative) Reference figures — Non-linear indications (SM)
Annex C (informative) Reference figures — Linear (LM) and aligned (AM) indications
Annex D (informative) Model of a magnetic particle test report
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Ordering information
5 Testing
5.1 Operating mode
5.2 Qualification of the operators
5.3 Surface preparation
5.4 Conditions of testing
6 Acceptance criteria
6.1 Definition of magnetic particle testing indications
6.1.1 General
6.1.2 Non-linear indications (SM)
6.1.3 Linear indications (LM) and aligned indications (AM)
6.2 Severity levels
6.2.1 General
6.2.2 Non-linear indications
6.2.3 Linear and aligned indications
6.2.4 Selection of the severity level
6.2.5 Designation of severity levels
7 Classification of the indications and interpretation of results
7.1 Classification of the indications using Tables 1 and 2
7.1.1 General
7.1.2 Non-linear indications
7.1.3 Linear and aligned indications
7.2 Interpretation of results
8 Cleaning after examination and demagnetization
9 Test report
Annex A (informative) Recommended surface finish for magnetic particle testing
Annex B (informative) Reference figures — Non-linear indications (SM)
Annex C (informative) Reference figures — Linear (LM) and aligned (AM) indications
Annex D (informative) Model of a magnetic particle test report
Bibliography