Category Archives: FAQs

Inconel 625 is a good material for acid corrosion but for large system of hydrochloric acid, especially with the corrosion that can occur with fumes and vapors, you may want to try a Hastelloy C22 or even tantalum if the … Continue reading

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A:  Metals and plastic have yield strengths because they start to stretch before breaking… the point where they start stretching is the “yield point” and the stress at that point is termed the “yield strength”. Ceramics on the other hand … Continue reading

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A: Of course it depends on the concentrations and temperatures you are operating at but generally speaking a very chemically resistant and strong polymer to consider would be PVDF or Kynar fasteners.   PVDF fasteners offers an ultimate tensile strength of 5000-8000 psi … Continue reading

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A: The problem probably isn’t acid, it most likely has to do with embrittlement of tantalum at elevated temperatures (beyond 250°C) if you are running your process in has oxygen . Tantalum can actually be used in strong concentrations of most … Continue reading

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A: Though I don’t know the specific strength requirements, I do know that Duplex 2507 is commonly used in situations that require both salt water corrosion resistance and high strength. Both Duplex 2205 and 2507 offer a high level of … Continue reading

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A: It is most likely the contaminants that are causing your zirconium screws to corrode. Though zirconium can easily handle sulfuric acid well beyond boiling and at 70% concentration – a far harsher condition than you have – it also … Continue reading

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Duplex 2205 screws are commonly used in sea water situations as the provide excellent protection from chloride stress corrosion cracking, as well as pitting and crevice corrosion. However Duplex 2205 does have a temperature limit of 300°C, after which you would … Continue reading

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Definitely do not try tantalum. This will not work very well either. Hydrofluoric acid presents an users with an unusual situation. Even the most corrosion resistant materials that can handle boiling HCl and H2SO4 like tantalum or Hastelloy are readily … Continue reading

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Super Duplex 2507 is often used in geothermal explorations. It is a steel alloy that contains chromium, molybdenum, and nickel which greatly improves its strength, corrosion resistance and temperature capabilities compared to most carbon steels. Super Duplex 2507 fasteners are known … Continue reading

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This is a very common problem but to answer it accurately, it depends on the environment that your flanges see and also to a certain extent what media is inside the flange. If we focus on corrosion only, the reason … Continue reading

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