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  1. theleftcoast

    316 Chloride Cracking - Short Duration Exposure

    @SJones - I pulled up ISO 15156-3 and read through the sections related to austenitic stainless steels. Thanks for the reference. If applied stress is related to chloride cracking thresholds, has anyone attempted to scale cracking thresholds measured at high stress levels (say 1.0 x yield or...
  2. theleftcoast

    316 Chloride Cracking - Short Duration Exposure

    EdStainless and SJones - After exposure of our test samples to steam conditions (~250 hours, 50g/L NaCL, 200-220C, pH 8-9), examination revealed no pitting or cracking. Based on what you both have said, cracking may follow after pitting is initiated. That is new information to me and very...
  3. theleftcoast

    316 Chloride Cracking - Short Duration Exposure

    Also, the test coupon we used was an as-manufactured piece of product. We lowered it to the bottom of the well, exposed it to steam conditions, pulled it out, and inspected it. It is pretty hard to do extensive testing because it is very expensive. This is a great data point for us to have...
  4. theleftcoast

    316 Chloride Cracking - Short Duration Exposure

    blacksmith37 - The screens are not annealed so they have some residual stress from being shaped. My primary goal with this post is to gain understanding around why short term exposure success might not agree with literature data. How long does an exposure need to be? What mechanism might be...
  5. theleftcoast

    316 Chloride Cracking - Short Duration Exposure

    My concern was primarily with "short" exposure of 316 to steam conditions (50% quality with liquid phase having 50g/L NaCl, 200-220C, at a pH of 8-9). During steam injection, oil wetting is really not something I count on. It is safe to assume there is little (or no) oil coating the 316. In...
  6. theleftcoast

    316 Chloride Cracking - Short Duration Exposure

    Under production conditions, pH is ~5-5.2 (this is a calculated pH at bottom of well, based on partial pressure of CO2 and H2S as well as the alkalinity of the water). Under steam injection conditions, the pH is much higher. There are no acid gases present. The steam quality is low (about 50%...
  7. theleftcoast

    316 Chloride Cracking - Short Duration Exposure

    Does anyone have experience with the chloride cracking resistance of 316L for short exposures to environments normally associated with cracking? Specifically, high temperature solutions containing a moderate concentration of sodium chloride? This is a thermal oil recovery application where...

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