ISO 15330 pdf download

ISO 15330 pdf download.Fasteners — Preloading test for the detection of hydrogen embrittlement — Parallel bearing surface method 1 Scope This International Standard specifies a preloading test which is able to detect the occurence of hydrogen embrittlement of fasteners at room temperature. This test is applicable to – metric bolts, screws and studs; – thread rolling screws; – self-tapping screws; – self-drilling screws; – nuts; – washers which are made of steel and are under tensile stress. The test shall be carried out within a temperature range of 1 0 ∞C to 35 ∞C. The test is suitable only for in-process control and may be carried out after any step of the manufacturing process. It is not intended as an acceptance test. It is capable of assessing differences or changes in processing conditions or techniques and to determine the effectiveness of the various processing steps including pre- and post-coating treatments (baking) to reduce the mobile hydrogen in the fasteners. This test does not relieve the manufacturer or processor from the responsibility of imposing and monitoring suitable process control. NOTE The chance of detecting hydrogen embrittlement decreases significantly if the test is started more than 24 h after the last step of manufacturing process. Therefore, in normal cases this test is not suitable for acceptance testing. Special attention shall be given to the reference test in clause 7.3. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 273:1 979, Fasteners — Clearance holes for bolts and screws. ISO 2702:1 992, Heat-treated steel tapping screws — Mechanical properties. 3 Terms and definitions For the purposes of this International Standard the following terms and definitions apply. 3.1 susceptibility to hydrogen embrittlement characteristic of a steel fastener to display brittle failure due to the presence of mobile hydrogen and when subjected to a significant degree of tensile stress and/or adverse service conditions NOTE 1 With increasing susceptibility to hydrogen embrittlement, the critical amount...