BS ISO 15461:2018 pdf free.Steel forgings一Testing frequency, sampling conditions and test methods for mechanical tests.
5.1 For the testing frequency of room temperature tensile tests and of impact tests, the requirements given in JJ1 to 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 CHD1O or CFHD1S and the test unit CU 100 can be regarded as equivalent with CFHDU 10. 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 TableAl, 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.
Tags: Steel forgings
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