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ISO 16573:2015 pdf free

ISO 16573:2015 pdf free.Steel – Measurement method for the evaluation of hydrogen embrittl ement resistance of high strength steels
ISO 16573 provides a method for the evaluation of the resistance to hydrogen embrittlement (i.e. hydrogen delayed fracture) using constant loading test with hydrogen pre-charged specimens. The amount of hydrogen content absorbed in the specimens is analysed quantitatively by thermal desorption analysis such as gas chromatography, mass spectrometry and so on. In the case of hydrogen continuous charging such as hydrogen absorption in aqueous solution at free corrosion potential, hydrogen absorption in atmospheric corrosion environments and hydrogen absorption in high pressure hydrogen gas, the evaluation method is also briefly described. This method is mainly applicable to the evaluation of hydrogen embrittlement resistance of high strength steel bolts.
This test method is used to evaluate material resistance to hydrogen embrittlement. Figure 1 shows schematic sequences for a) hydrogen pre-charging method and b) hydrogen continuous charging method.
For the hydrogen pre-charging method [see Figure 1 a], prepare a test specimen which has a higher hydrogen level by forcibly charging hydrogen into the specimen. Apply constant load to the hydrogen charged test specimen and measure the time to failure. By testing specimens containing various contents
of diffusible hydrogen, which is mainly responsible for hydrogen embrittlement, the relationship between diffusible hydrogen content and times to failure can be obtained. Diffusible hydrogen content can be measured by thermal desorption analysis using the test specimen after failure. This method can provide at least qualitative comparison of the resistance to hydrogen embrittlement among several high strength steels having different microstructures or compositions. For the hydrogen continuous charging method [see Figure 1 b], a test specimen is loaded in one of the following three conditions:
a) in aqueous solution at free corrosion potential;
b) in atmospheric corrosion environments;
c) in high pressure hydrogen gas.ISO 16573 pdf download.


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