BS/EN 1982-2008 pdf download.Copper and copper alloys – Ingots and castings.
NOTE In cases of dispute concerning the composition of Ingols or of castings, the method of sampling and the
analytical procedure to be used should be agreed between the disputing parties.
8.2 Mechanical tests
8.2.1 Tensile test
When the tensile properties are determined to verify conformity of a batch of ingots or castings with this standard (see 6.2), the test shall be carried out in accordance with EN 10002-1 on the proportional test pieces prepared from the test samples or bars (see 8.2.2).
For expression of the results of the tensile test, the rounding rules given in 8.8 shall be used.
8.2.2 Preparation of tensile test samples
Sand cast test bars shall have diameters between 12 mm and 25 mm. They shall be cast separately from the castings in sand moulds, from the same cast as the castings they represent.
NOTE 1 For alloys with a long freezing range, a test bar fed at one or both ends is recommended, For other alloys, a test bar fed all along its length is preferred.
In the case of permanent mould castings. test bars shall be separately cast in metal moulds
NOTE 2 The test bars. whether sand cast or permanent mould cast, may be tested as cast (i.e. without machining). Alternatively, at the discretion of the supplier, test pieces may be machined from the bars for testing.
If test bars representing sand or permanent mould castings are machined, they shall have an effective diameter between 10 mm and 18mm and shall be proportional test pieces, as descnbed in EN 10002-1.
For centrifugal castings, the test bars shall be taken either from the casting, or cast separately, as specified by the purchaser (See 5 m)J. Separately cast test bars shall be cast in moulds comparable to the moulds for the castings. If the purchaser opts for test samples to be taken from castings over 50 mm th4ck, the location of the test sample and its properties should be agreed between the purchaser and the supplier,
NOTE 3 For castings which are to be heat treated, for example for homogenizing or stress relieving, the test bars corresponding to the castings should be heat treated with the castings, unless otherwise agreed between the purchaser and the supplier.
If test bars are required for pressure die castings, a separately cast flat test bar shall be used and tested without machining. It shall be from 2 mm to 4 mm thick and its freezing rate and iniection parameters shalt be as comparable as possible to the die castings represented. (See note 4 of 6.2 concerning the mechanical properties of pressure die castings.)
Where practicable, hardness tests shall be made either on a convenient portion of the casting, unless otherwise specified, o on the end of the tensile test bar representative of the castings. The test shall be carried out in accordance with EN ISO 6506-1 using a 0,102 F/fl2 ratio of 10, e.g. using a 1,00mm diameter ball and a force of 98,07 N, or a 2,5 mm diameter ball and a force of 612,9 N.
8.3 Electrical conductivity
When the electrical conductivity of Cu-C (CCO4OA) and CuCrl-C (CC14OC) castings is to be determined, the test shall be carried out by the use of an eddy current testing instrument.
NOTE The electncal conductivity of Cu-C (CCO4OA) and CuCrl-C (CC14OC) castings s not routinely determined. If such tests are required, the details of the test and the sampling rate should be agreed between the purchaser and the supplier [see 59)],
8.4 Microstructure
8.4.1 Alpha-phase determination
When the proportion of alpha-phase in the microstructure of CuZn35Mri2AllFel-C (CC765S) castings is to be determined, a suitable section of the test casting shall be pohshed, using normal metallographic techniques, etched to reveal the microstructure and examined microscopically. The proportion of alpha-phase in the microstructure shall be measured by any appropriate counting method. The test shall consist of at least five counts and the average of the counts shall be taken as the alpha-phase content of the material.
8.4.2 Grain size determination
The average grain diameter shall be determined in accordance with EN ISO 2624, using either the comparison method or the intercept method. A transverse slice shall be taken from the ingot, selected as a representative of the cast, at a point one third of the length of the ingot distant from one end. A surface area approximately 1 cm2 on the vertical axis of this slice and one third of the depth of the ingot from the bottom, shall be prepared for metallographic examination, appropriate for the determination of the average grain size.
8.5 Dezincification resistance
When the dezincification resistance of permanent mould castings, or pressure die castings, in alloys
CuZn33Pb2Si-C (CC751S) and CuZn35Pb2AI-C (CC752S) is to be determined, the test method given in
EN ISO 6509 shall be used on test pieces prepared from samples obtained in accordance with 7.5.
8.6 Surface condition
When there is a special requirement for surface roughness, it Is recommended that inspection is carried out in accordance with EN 1370.BS/EN 1982-2008 pdf download.