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Recent content by CWicker

  1. CWicker

    Overheating of 18Cr-18Mn stainless steel

    We have recently had an incident in a turbine generator where an earth fault caused excessive damage to the stator and rotor. Melted copper was deposited on the outer surface of the 18Cr-18Mn coil retaining ring. Copper melts at 1085degC. I would expect that as the copper cooled, excessive...
  2. CWicker

    Effect of hydrotest on component stress

    What is the effect of hydrotesting a steel vessel to pressures ranging from 1,2 to 1,35 times the design pressure in terms of approaching or exceeding the yield strength? Can limited yielding be expected? If a vessel has been hydrotested to 1,35x design pressure at commissioning and then...
  3. CWicker

    Crevice corrosion

    Thanks for the responses Metalguy. We have performed an extensive refurbishment programme on about 4000m of 304L piping - we surface buffed ALL the pipe and inspected with liquid dye penetrant. ALL defects (pits, cracks, scratches etc) were then removed by deeper buffing (while respecting...
  4. CWicker

    ASTM A723

    30NCD12 is directly equivalent to ASTM A723 grade 2. The equivalent Werkstoff no. is 1.6655 or 32NiCrMo12-5.
  5. CWicker

    Crevice corrosion

    We dose the system with crystalline boric acid - it is the nuclear safeguard system of a Pressurised Water Reactor. The 304L has suffered severe transgranular SCC deradation on the external surface and our concern is that it will be especially susceptible to any form of impurity or oxygen...
  6. CWicker

    Crevice corrosion

    We are using backing rings in 304L piping where it is difficult to obtain a satisfactory purge. The service fluid is borated water at 25 deg Centigrade. The piping has proven to be extremely susceptible to SCC from external chloride contamination and high residual tensile stresses. Therefore...
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