Low alloy steels with a nickel content greater than 1% are not allowed in sour service applications. This paper reviews the effect of nickel on the hydrogen embrittlement performance of low alloy steels.
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Effect of nickel on the phase transformation kinetics of low alloy steels
This posts summarizes the main effects of nickel on the phase transformation of kinetics of low alloy steels.
Hydrogen Embrittlement of Nickel Alloy Steels
This post illustrates a possible sulfide stress cracking mechanisms at the open circuit potential for low alloy steels.