ISO 377:2013 pdf download – Steel and steel products – Location and preparation of samples and test pieces for mechanical testing

03-01-2022 comment

ISO 377:2013 pdf download – Steel and steel products – Location and preparation of samples and test pieces for mechanical testing
4.1 Representative testing
Sample, rough specimens and test pieces selected in accordance with Annex A shall be considered to be representative of the product. NOTE As a result of their production sequence, e.g. melting, casting hot or cold forming or both, heat treatment etc., steel products are not homogeneous. The mechanical properties of samples taken from other locations can be different.
4.2 Identification of sample products, samples, rough specimens and test pieces
Sample products, samples, rough specimens and test pieces shall be marked to ensure traceability to the original product and their location and orientation in that product. For this purpose, if, during the preparation of any one or more of the samples, rough specimens or test pieces, removal of the marks cannot be avoided, transfer of these marks shall be carried out before the existing marks are removed or in the case of automatic preparation equipment before the test piece is removed from the equipment. In the case of specific inspection and where requested by the purchaser, the transfer of the marks shall be carried out in the presence of the purchaser’s representative. In the case of fully automatic in line preparation and testing systems, marking of samples, rough specimens and test pieces is not necessary if an adequate control system exists, which defines the procedures to follow in the event of system failure.
5.3.1 General
The material or product standard shall specify whether the test is intended to determine the properties
a) in the as-delivered condition (see 5.3.2); or
b) in the reference condition (see 5.3.3).
5.3.2 Testing in the as-delivered condition
A sample intended for testing in the as-delivered condition shall be separated from the product either
a) after the forming or heat treatment processes or both have been completed; or
b) before the heat treatment process, in which case the heat treatment of the separated sample shall be carried out under the same conditions as that of the product.
Separation of the sample shall be carried out in such a manner so as not to change the characteristics of that part of the sample used to provide the test pieces.
If flattening or straightening of the sample is unavoidable in the preparation of the test piece, the flattening or straightening shall be carried out cold unless otherwise specified in the product standard.
5.3.3.1 Sample
A sample intended for testing in the reference condition shall be separated from the product at the stage of manufacture specified in the product standard or order. Separation of the sample shall be carried out in such a manner so as not to change the characteristics of that part of the sample used to provide the test pieces after heat treatment. Flattening or straightening, if necessary, can be carried out either hot or cold before any heat treatment. When carried out hot, it shall be at a temperature below the final heat treatment temperature.

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