BS ISO 4986:2020 pdf free.Steel and iron castings一Magnetic particle testing.
BS ISO 4986 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 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. 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 – – Penetrant testing and magnetic particle testing一Viewing conditions ISO 4990, Steel castings 一General technical delivery requirements ISO 9712, Non-destructive testing一Qualification and crtification of NDT personnel ISO 9934-1, Non-destructive testing一Magnetic particle testing一Part 1: General principles The surface to be tested shall be clean and free from oil, grease, sand, scale, moulding and coating residues, or any other contaminant which can interfere with the correct implementation and interpretation of the magnetic testing results. For small indications, it may be necessary to improve the surface condition. Annex A provides guidance on recommended surface finish for testing based on indication allowed. The surface may be either shot blasted with round or angular shot, or sand blasted, or ground or machined so that the smallest relevant indication required can be evaluated. The surface to be tested may be painted to provide a contrast before the test. BS ISO 4986 pdf download.