BS ISO 4986:2020 pdf download.Steel and iron castings — Magnetic particle testing.
1 Scope
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 kAJm.
This document only applies to those areas of the castings specified for testing, as well as the percentage of castings to be tested.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3059. Non—destructive testing Pen etrant testing and magnetic particle testing Viewing conditions
ISO 4990. Steel castings General technical delivery requirements
ISO 9712, Non-destructive testing Qualification and certification ofNDTperconnel
ISO 9934— I, Non—destructive testing — Magnetic particle testing Part I: General principles
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
IEC Electropedia: available at http://www.cIectropedia.or
ISO Online browsing platform: available at http://www.iso.org/obp 4 Ordering information
Subject to agreement between the manufacturer and the purchaser, enquiries and purchase orders for castings requiring magnetic particle testing should include the following information:
a) the area of the casting to he tested;
b) the qualification of the operators who will carry out the testing (see ) or interpretation (see 7):
c) the frequency/number of castings to be tested:
d) the manufacturing stage, when magnetic particle testing is to be performed;
e) the required surface finish of the areas to he tested (see 5.3):
f) if testing is to be performed in only one direction (see 5.1):
g) the method to be used (type of detection media);
h) whether or not the casting is to be demagnetized after testing has been performed (viz. maximum residual field strength values);
i) that test is to be carried out in accordance with ISO 9934-1;
j) the type of discontinuity;
k) the severity level.
The sensitivity can differ depending on the method of magnetic particle testing selected. Therefore, the severity levels required and the method shall be agreed between the manufacturer and the purchaser.
The severity level can vary depending on the method of magnetic particle testing selected and the area of the casting tested (see Tables 1 and 2).
The indications produced by magnetic particle testing can be compared to reference figures. The reference figures are included for convenience only. In the event of a dispute, reference shall be made to the tables.BS ISO 4986 pdf download.