BS ISO 15461:2018 pdf download – Steel forgings — Testing frequency, sampling conditions and test methods for mechanical tests

BS ISO 15461:2018 pdf download – Steel forgings — Testing frequency, sampling conditions and test methods for mechanical tests
3.1
specific inspection and testing
inspection and testing carried out before delivery, according to the technical requirements of the order,on the products to be supplied or on test units of which the product supplied is part, in order to verify whether these products comply with the requirements of the order
[SOURCE: ISO 404:2013, 3.4, modified — “and testing” has been added and the wording has been altered.]
3.2
test unit
number of pieces or the tonnage of products to be accepted or rejected together, on the basis of the tests to be carried out on sample products in accordance with the requirements of the product standard or order
[SOURCE: ISO 404:2013, 3.6, modified — the wording has been altered slightly and the notes to entry have been deleted.]
3.3
sample product
item (e.g. bar, sheet, coil) selected for inspection or testing
[SOURCE: ISO 377:2017, 3.2]
3.4
sample
sufficient quantity of material taken from the sample product for the purpose of producing one or more test pieces
Note 1 to entry: In certain cases, the sample can be the sample product.
[SOURCE: ISO 377:2017, 3.3, modified — a note to entry has been deleted.]
3.5
test piece
part of a sample, with specified dimensions, machined or unmachined, brought to a required condition for submission to a given test
[SOURCE: ISO 377:2017, 3.5, modified — the wording has been altered slightly and a note to entry has been deleted.]
Note 1 to entry: In certain cases the test piece can be the sample.
3.6
ruling section
section for which the mechanical properties are specified
4 General
Unless otherwise specified in this document, the general conditions given in ISO 377 for the marking and preparation of samples and test pieces apply.
Where the conditions specified in this document differ from the conditions specified in the product standard or order, then the conditions of the product standard or order apply.
5 Testing frequency
5.1 For the testing frequency of room temperature tensile tests and of impact tests, the requirements given in 5.1.1 to 5.1.3 apply. 5.1.1 The product standard or order shall specify, by reference to the appropriate symbol(s) in Table 1, column 1, the following: a) the composition of the test unit as defined in Table 1, columns 2 to 8; b) whether uniformity checks by hardness tests in accordance with Table 1, column 9 are required and, if so, the percentage of products to be subjected to the hardness tests; c) the number of sample products to be taken from the test unit. (See the explanations in Table 1, footnote a , for replacing the letter “n” of the symbol by the mass of the test unit up to which the taking of one sample product is sufficient.)
NOTE Less stringent requirements for the composition of the test unit can be compensated by more stringent requirements for the number of sample products to be tested. Therefore, for example, a test unit characterized by the symbol CH5 can be regarded as equivalent to a test unit characterized by the symbol CHD10 or CFHD15 and the test unit CU100 can be regarded as equivalent with CFHDU10. Consequently, it seems possible and reasonable to specify in the product standards or orders not only one distinct test unit, but to leave various equivalent test units to the choice of the manufacturer or to an agreement at the time of enquiry and order, as shown in the example in Table A.1, column 5.
5.1.2 In general one sample is to be taken per sample product. The product standard or order may, however, by reference to the symbols in Table 2, specify that in the case of products with a length and/or mass greater than a certain limiting value two samples per sample product shall be taken.
5.1.3 If room temperature tensile tests are to be carried out, one tensile test piece shall be taken per sample. If impact tests are to be carried out, three impact test pieces shall be taken per sample.
5.2 If elevated temperature tensile tests are to be carried out, the product standard or order shall specify the number of test pieces to be taken for this test in relation to the number of test pieces to be taken for the room temperature tensile test (see example in Table A.1, column 9).
5.3 For simplifying comparisons the data for the frequency of testing should preferably be specified in the form of a table. (See the example in Table A.1.)BS ISO 15461 pdf download.