ISO 4992-1 pdf free download

ISO 4992-1-2020 pdf free download.Steel castings一Ultrasonic testing一 Part 1: Steel castings for general purposes.
4 Requirements
4.1 Order information
The following information shall be available at the time of enquiry and order (see also ISO 16810):
a) the areas of the casting and the number or percentage of castings to which the requirements of ultrasonic testing apply (testing volume, extent of testing);
b) the acceptance levels to be applied to the various zones or areas of the casting;
c) requirements for a written test procedure;
d) whether there are any additional requirements for the test procedure, see also 5.5.1.
4.2 Extent of testing
The casting shall be tested so that the agreed areas are covered (insofar as this is possible from the shape of the casting) by the use of the best applicable test technique.
For wall thicknesses greater than 600 mm, agreement shall be made between the purchaser and manufacturer on the acceptance levels, test procedure, and the recording of the test results.
4.3 Maximum acceptable size of discontinuities
4.3.1 General
Single discontinuities extending into the rim zone and core zone shall be evaluated as rim zone.
4.3.2 Acceptance levels for planar discontinuities mainly orientated perpendicular to the surface
The acceptance levels for planar discontinuities are given in Figure 1.
Discontinuities exceeding 3 mm FB[I shall not be acceptable in class 1.
The largest dimension of a discontinuity in the through-wall direction shall not exceed 10 % of the wall thickness, except discontinuities with a length 10 mm. Discontinuities with a length 10 mm shall not exceed a dimension in the through-wall direction of 25 % of the wall thickness.
The greatest distance between discontinuities, as a criterion for evaluation as a single discontinuity or a discontinuity area perpendicular or lateral to the surface, shall be 10 mm.
For a discontinuity with more than 3 mm in length and non-measurable dimension in the through-wall direction, this non-measurable dimension shall be taken as 3 mm and the discontinuity area shall be calculated as follows:
A=3L (1)
where
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ISO 4992-1:2020(E)
A is the area of discontinuity, in square millimetres;
3 is the width taken, in millimetres;
L is the length, in millimetres.
4.3.3 Acceptance levels for volumetric discontinuities
The acceptance levels for volumetric discontinuities are given in Table 1. Any discontinuity exceeding
one of the levels shall not be acceptable.
4.3.4 Maximum acceptable discontinuities when radiographic testing (RT) of the casting is carried out as a supplement to ultrasonic testing (UT)
Unless otherwise agreed at the time of enquiry and order, when conducting radiographic and ultrasonic testing in combination it was proven that if a discontinuity indicated by radiographic testing is situated in the core zone, the discontinuity is acceptable at one level lower, e.g. in class 3 instead of class 2 for radiographic testing. For further information, see EN 1559-2.
4.4 Qualification of personnel
Ultrasonic testing shall be performed by qualified personnel. Qualification of personnel may be according to ISO 9712 or other equivalent recognised standards.
4.5 WaIl-section zones
The wall section shall be divided into core and rim zones as shown in Figure 2. These zones relate to the dimensions of the casting ready for assembly (finish-machined).
4.6 Classes
lithe purchaser specifies different classes in different areas of the same casting. all of these areas shall be clearly identified and shall include:
a) all necessary dimensions for accurate location of zones;
b) the full extent of all weld preparations and the thickness of any special rim zone. Class 1 is only applied to weld preparations and special rim zones.
Unless other requirements have been agreed at the time of acceptance of the order, for finishing welds, the requirements for the parent metal shall apply.ISO 4992-1 pdf download.