UkraineFor estimation o f hydrogen influence on the workability o f high-stressed parts o f p ow er plan t unit equipment it is necessary to use the crack growth resistance parameters. The new 18M n-18Cr steel has higher resistance to hydrogen embrittlement and longer residual life time in hydrogen, than the traditional 8M n-8N i-4C r steel. K e y w o r d s : w orkability, fracture toughness, hydrogen em brittlem ent, critical crack size, durability.
1.C ra c k In itiatio n in M o d ern P o w er E n g in eerin g S tru c tu ra l C om ponents O p e ra tin g in G aseous H y d ro g en . Energy units and structural com ponents of fusion pow er plants (FPP) and nuclear pow er plants (NPP) operate in contact w ith gaseous hydrogen. As exam ple, Fig. 1 shows a typical schem e o f such structural com ponents. N ote that in m odern FPP and N PP there exist hydrogen-producing devices (electrolyzers, freezers, separators, condensate accum ulators, etc.), widebranched and long system o f hydrogen pipeline, pum ps, system o f cleaning and drying o f hydrogen. The problem o f w orkability assessm ent o f structural steels in gaseous hydrogen environm ents is critical for m odern pow er engineering.
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