HIC test, HIC test standard
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HIC hydrogen induced cracking test called anti hydrogen induced cracking test, hydrogen embrittlement test, hydrogen induced cracking. Compared with the metal atom, the hydrogen atom is very small, and it is easy to diffuse from the gap between the metal atoms to the metal matrix, and physical and chemical action with the matrix, so as to reduce the mechanical properties of the metal matrix.
In the oil refining industry stable gasoline distillation tower overhead condenser, hydrodesulfurization unit product cooler, stripper top condenser and oil gathering pipeline etc., because of the carbon steel and low alloy steels exposed in H2S environment, due to corrosion of hydrogen generation intrusion in the steel section, resulting in stepped crack occur in the steel rolling direction, called hydrogen induced cracking, as well as the bubble. Hydrogen sulfide is one of the most harmful medium in oil and natural gas. In the process of natural gas transportation, the stress corrosion of hydrogen sulfide in the pipeline is very large.
HIC we test the standard for most of the use of TM0284 HIC, NACE is the abbreviation of hydrogen induced cracking, NACE is the United States Association of corrosion engineers.
HIC tests are used for pressure vessels and valves. Test requirements: the test sample is the best steel by two plates of A4 paper size. The test results generally include 1 product name, specifications, test the conclusion of the 2 test position, the size and number of the 3 test methods 4 test values include: reagent crack length ratio CLR, crack thickness ratio CTR, crack sensitive rate of CSR 5 A solution for oxygen nitrogen, hydrogen sulfide gas, sodium chloride, acetic acid and distilled water or deionized water. For B reagent solution oxygen nitrogen, hydrogen sulfide gas and artificial seawater. Hydrogen sulfide gas is highly toxic and must be treated with caution.
Evaluation method for hydrogen induced cracking of TM0284 NACE pipeline steel and pressure vessel
Evaluation of hydrogen induced cracking of GB/T 8650 pipeline steel and pressure vessel steel