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  1. TEV

    Galvanic Corrosion in mixed SS - Paper

    I recall seeing a paper published some time ago describing sea water galvanic effects between some different austenitic and (I think) duplex stainlesses that showed a galvanic corrosion reversal between 316 and another SS. The author may have been Kearns. I cannot locate the paper. Can anyone...
  2. TEV

    High Presssure Fittings

    Where are high pressure (15ksi max) fittings in sizes 1/4, 3/8 and 1/2 inch used in petroleum recovery, refining and chemical processing, and what specifications are customarily applied? ASME/ASTM? MR0175? MR0130? What applications are there outside of the petrochem industry? What specs...
  3. TEV

    High Pressure Tube Fitting

    We have a new high pressure stainless steel tube fitting for use with hard drawn or thick walled SS tubing in sizes 1/4, 3/8 and 1/2 inch. The design provides an easily made leak-tight connection at pressures up to 15 ksi with a safety factor of four. We don't have a very good handle on the...
  4. TEV

    Alloy for Hi T,P in Sulfuric Acid with Chloride

    I am looking for a recommendation on an alloy for use in a high temperature, high pressure Sulfuric Acid and Chloride or Sulphate solution. System is tubing and connectors, valves, etc. Conditions are: Solution 1: 3% H2SO4 + 1% NaCl Solution 2: 3% H2SO4 + 3% MgSO4 + <1% Al2(SO4)3...
  5. TEV

    Hot cracking is SS welds - Boron?

    We are experiencing some hot cracking problems in welding thin gauge 304L stainless sheet into tubing. Analysis of the weld area showed the presence of Boron, among other elements. According to the literature, Boron is the number one bad actor for causing hot cracking in welding. But when we...
  6. TEV

    Monel Corrosion

    What can cause grain boundary corrosion attack in Monel 400? I am aware that aerated hydrofluoric acid can cause stress corrosion cracking in Monel, but can it also attack the grain boundaries? I am looking at some 316 stainless tubing that has been in service in HF gas. There is no evidence...
  7. TEV

    A-286 Test for Over/Under Aged

    I have a large number of small parts machined from A-286. After machining, a few of the parts were found to be harder or softer than recommended specification, believed to be due to improper age hardening treatment. We need a quick way to sort the defective from the acceptable parts...
  8. TEV

    Higher Strength 316 SS Forgings

    We source Type 316 stainless steel forgings for manufacture of some of our machined products. We need to get as much strength as possible in these forgings to optimize the performance of our products. We have specified Carbon and Nitrogen contents as high as our suppliers will accept within...
  9. TEV

    Antimony Black Antigalling/Lubricant

    Can anyone direct me to information about &quot;antimony black&quot; as an anti-galling and/or lubrication coating for stainless steel? How is it applied? Is it used as a mixture with other compounds?

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