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  1. YLWEA

    17-7 PH disc springs failure!!!

    Several years ago when I was working with 17-4PH in hot brine with some H2S the standard guidance was that the preferred heat treatment was H1150M. Not sure if that is still true, but we did have failure of valve stems at lower temperature treatments (such as H900, I believe). If I was in your...
  2. YLWEA

    Cathodic protection for deep well

    I assume you already know that the CP won't protect the inside of the casing where the wastewater is. The OD of casing is routinely protected by CP, although others are better suited to provide details of things to consider and how to do it.
  3. YLWEA

    Checking H2S corrosion pipe

    XRD analysis can be performed by many chem analysis labs. It is useful because instead of merely determining the chemical composition, it determines the crystalline form of the corrosion product. It can differentiate among various types of oxides, carbonates, and sulfides, for example, rather...
  4. YLWEA

    Checking H2S corrosion pipe

    we have successfully used XRD (x-ray diffraction) of corrosion products as an indicator of the most likely corrodents. The corrosion product identification is best used in conjunction with electrochemical potential-pH charts since the compounds are not always obvious indicators of the specific...
  5. YLWEA

    corrosion prevention of non used equipments

    I agree that dehumidification can be effective...if it is properly maintained. VCI use is much less reliant upon maintenance of the systems that keep everything dry.
  6. YLWEA

    corrosion prevention of non used equipments

    There are several types of volile corrosion inhibitors specifically made for that purpose. Check out Cortec products as an example. http://www.cortecvci.com
  7. YLWEA

    A106 Pipe Fatigue Limit

    This is only a partial answer, but the actual mechanical properties often do not resemble the minimum specified properties (in our experience)so it is difficult to predict what the fatigue performance will be based on grade alone. The specified minimum yield strength of grade B pipe (either A53...
  8. YLWEA

    Post 1945 steel vs pre-1945 steel

    I think the key statement in the brief article was the reference to the old steel being "...valuable today for various researches." To me that is different from being valuable for modern industrial applications. I can see where some metallurgists might find the old steels that are typical of...
  9. YLWEA

    Aluminium coating on super duplex?

    About 20 years ago we used thermal sprayed anodic coatings to prevent external SCC of stainless steel piping. Process fluid was oxygen free and nearly neutral pH so no ID cracks, but if it dripped on the ajacent piping the oxygenated and highly concentrated (by evaporation) fluid caused...
  10. YLWEA

    Is there a correlation between Brinell hardness and yield strength?

    I'm not advocating the use of the references I cited to establish the hardness/yield relationship of the componenets that were the subject of this thread. I only meant to illustrate that such relations can be established for steel. In the case of the ASME study I took a quick look at the...
  11. YLWEA

    Is there a correlation between Brinell hardness and yield strength?

    Metalguy - there are empirical relationships that have been established for hardness and yield strength for some steel products. Examples include yield strength of steel pipe established in a study conducted by Battelle for ASME a few years ago (see "Determining the Yield Strength of...
  12. YLWEA

    Carbon steel maximum operation temperature

    Also, note the increased susceptibility of weld HAZ to the problem. If/when it occurs it will probably occur there first. I agree with unclesyd. If you want to get quantitative then you need details, including steel composition.
  13. YLWEA

    galvanized flashing against concrete

    I would avoid stainless if salting is common. It is highly likely to pit in the crevice areas and will be quite expensive relative to other options. Aluminum may not be much better in some cases. I've seen 10-15 yr. old corroded aluminum sliding door sills mounted on concrete foundations, and...
  14. YLWEA

    galvanized flashing against concrete

    First, I'm sorry for the lousy editing on my first message. I should have read it over before clicking the "submit post" button. Edstainless, I agree that copper could be considered, although the potential for unsightly staining from the initial corrosion of the copper should be considered...
  15. YLWEA

    galvanized flashing against concrete

    I am not a structural guy with formal experience in the building industry, but I believe that galvanized steel components are very commonly used as anchors for typing wood to concrete as well as for many similar applications. Stainless steel is not impervious to corrosion in crevice conditions...
  16. YLWEA

    COPPER PIPE EROSION CORROSION

    I have a paperback reference from "The Institute of Marine Engineers" called "Marine Engineering Practice Volume 1, Part 10 Selecting Materials for Sea Water Systems" and it does address copper pipe velocity limits in general terms, including a qualitative graph of water velocity versus...
  17. YLWEA

    How can carbon harden 316L & improve corrosion resistance?

    in that case I would probably investigate the suitability of one of the Nitronic stainless steels rather than 2205. They seem to be intended specifically for galling, rubbing, etc.
  18. YLWEA

    How can carbon harden 316L & improve corrosion resistance?

    What I was trying to get at was why surface hardness is considered a valuable attribute? I'm trying to get some feel for why you think perhaps the high strength of 2205 won't be good enough in the absence of a hard surface. No big deal, I was just curious and the answer might help some posters...
  19. YLWEA

    Corrosion Protection for Underground Compressed Air Pipe

    As a gas utility guy I can say that 3-layer poly is not a common coating for most distribution applications. It is more likely to be used where the need for extremely high reliability (such as offshore) or resistance to abrasion (such pulling pipe through a bore) warrants the high cost. The...
  20. YLWEA

    How can carbon harden 316L & improve corrosion resistance?

    can you tell us what degradation mechanism is of concern, i.e., metal-to-metal galling, sliding wear, high velocity liquid erosion, cavitation, solid particle impact etc?

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