This paper summarizes results of studies conducted in the U S A over the past jive years to identify factors responsible ,for .stres,s corrosion crucking (SCC) of forged, shrunk-on, low-alloy steel discs in low-pressure ( L P ) steam turbines used in nucleur power plants. Experience in the U K and subsequent research jndings .are reviewed, and results of a survey of U S experience and qf comp~*ehen.sit~ experimental programs are reported. Recommendations are presented to minimize SCC of LP turbine discs in exisfing andJuture power plants. I n general, the work performed revealed: ( i ) no specijic chemical contaminant is required for cracking; crack initiation and growth occur in pure condensed steam; (ii) the yield strength of a disc steel is the dominant factor governing cruck growth rutes; (iii) other factors being equal, a higher incidence of cracking may be expected in rotor designs huuing higher applied stress lez?els. Cruck initiation and growth in L P turbines may be minimized by control of the environment, by use of' low-strength alloys, and by-desi{jns which eliminate keyways and minimize applied stress levels.
This paper presents a description of application of constant strain rate test to evaluation of stress corrosion cracking (SCC) resistance of engineering alloys, in general, and to oil field materials exposed to H2S environments, in particular. Tests to discriminate between susceptible and nonsusceptible low alloy steels exposed to an H2S-CO2 environment and to determine the temperature at which the alloy (in a specific heat treat condition) becomes immune to SCC are described.
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