Environmentally assisted cracking of nickel steels in liquid mercury, hydrogen and methanol
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Nickel steels ASTM A353 and A553 (9% Nickel) and ASTM A203 Gr. E (31/2% Ni) were studied for environmental cracking resistance using laboratory slow strain rate and constant load tests. Potential cracking mechanisms included mercury liquid metal embrittlement (Hg LME), hydrogen embrittlement and methanol stress-corrosion cracking (MeOH SCC). No susceptibility to MeOH SCC was observed in these tests. Cathodic charging with hydrogen strongly embrittled both 31/2% and 9% Ni steel. These tests revealed a serious susceptibility of ASTM A353 9% Ni steel to Hg LME. Tests of quenched and double-Tempered ASTM A553 9% nickel steel indicate much reduced Hg LME susceptibility compared to the ASTM A353 9% Ni steel in the double-normalized and tempered condition. ASTM A203 Gr. E 31/2% Ni steel resisted Hg LME and MeOH SCC in these tests. © 2013 by NACE International.
author list (cited authors)
McIntyre, D. R., Case, R. P., Ballantyne, T., Phillips, C., & Woodward, S.