BS EN 1559-3:2011 pdf download
BS EN 1559-3:2011 pdf download.Founding — Technical conditions of delivery Part 3: Additional requirements for iron castings.
7.3.3.2 .
7.3.3.3 The selection of a non destructive testing method is dependent on the tNckness and material of the casting and the position, orientation and size of possible discontinuitles in the relevant section.
Different acceptance criteria can be specified for different areas of the same casting (e.g. marked zone and unmarked area), Moreover, for the same area of the casting different acceptance cnteria can be specified according to the non destructive methods selected
For all non destructive testing methods, the acceptance criteria (discontinuity levels) can be graded with increasing number and]or extent of indications
Unless specifically agreed. discontinuibes revealed on cast surfaces which are to be machined, are not to be regarded as discontinuities. when these discontinuities are totally removed by machining.
Guidelines for the specification of acceptance criteria for discontinuities are given in the informative Annex A.
7.3.3.4 If applicable, the roughness of the cast or grinded surface shall be specified,
N 1370 shall be used to specify the acceptance levels and shall be subject of an agreement between the manufacturer and the purchaser by the time of acceptance of the order.
Guidelines for the specification of acceptance criteria for the surface condition are given in the informative Annex B.
7.3.4 • Condition of the casting
7.3.5 • Mass of the casting
The mass can be calculated using the mass density given in the corresponding matenal standard.
7.3.6 • Additional requirements regardIng the condition of the casting
The microstructures to be examined, the tests to be applied and any other requirement to be determined shall be subject of an agreement between the manufacturer and the purchaser by the time of acceptance of the order.
8 Inspection
8.1 • General
8.2 • Type of Inspection documents and type of inspection
The requrements given in the relevant matenal standard shall also pIy.
8.3 Test unit
8.3.1 • Formation of test units
8.3.2 • Size of test units
The requirements given in the relevant material standard shall also apply.
8.3.3 • Inspection frequency
The requirements given in the relevant matenal standard shall also apply.
A.1 General
These guidelines for the specification of acceptance critena for casting disconhlnuibes m Won castings can be applied to castings made of all types of cast Iron in as-cast or mactuned condition. This Annex does not apply to the visual check of Won castings. (see Annex B).
A.2 Casting discontinuities
The most common discontinuities are. a 0.:
— sand Inclusions;
— slag incluskins; dross;
— gas porositees.
— shrinkage porosities.
A.3 General requirements
Maximum discontinuity indication size should be measured according to the rules given in the appropnate standard.
— Two or more discontinu.t.es are to be combined according the rules given in the appropnate standard.
The reference testing area should be 105 mm x 148 mm. lithe casting surface or marked zone is smaller ii area than this reference surface area, the number or total area of discontinuilies should be proportionally reduced
NOTE The area of 105mm 148mm corresponds with the frames used m prEN 1:369, EN 1370 and EN 1371-1.
A.4 Discontinuity classes
Casting discontinuities can be classified into three discontinuity classes as shown in Table Al.
These classes are based on the shape of the discontinuities, linear or non linear (defined in prEN 1369 and EN 1371-1), and position, surface or internal, of the discontinuities.
A.6 Machined surfaces and bores
Discontinuity levels on machined surfaces and bores should be specified as discontinuities in the surface.On some machined surfaces, a higher requirement can be specified for reason of e.g. bearing ratio, leaktightness,abrasion resistance or sliding properties and not primarily for strength.
To be able to comply with these requirements, it is important that the casting manufacturer should be informedabout the machining process to be performed.
A.7 Marked zones
lf specific zones of a part are important in terms of strength or surface condition, these zones should bemarked on the drawing with specified discontinuity class and discontinuity level.
The material may be grinded down to the minimum size indicated in the drawing to eliminate discontinuities,as long as no notches are formed.
