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Topic: Is it better to use a Hastelloy C alloy or 316L stainless steel?

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We need to install a level switch probe in 98% sulfuric acid. Based on corrosion resistance, would it be better to use a Hastelloy C alloy or should we use 316L stainless steel? The storage tank temperature is 70 to 90 degrees F and there is no contamination of the acid.
  • Avatar pharmamanufacturing Manufacturing Community Member 151 Posts

    Re: Is it better to use a Hastelloy C alloy or 316L stainless steel?

    According to NACE Recommended Practice RP-0391 "Materials for the Handling and Storage of Commercial Concentrated (90 to 100%) Sulfuric Acid at Ambient Temperatures," either of these materials of construction should work for 98% sulfuric acid under the conditions you have described.

    Brian Dalder, engineering consultant, Eli Lilly 

  • Avatar pharmamanufacturing Manufacturing Community Member 151 Posts

    Re: Is it better to use a Hastelloy C alloy or 316L stainless steel?

    It is certainly better to use hastelloy c alloy, preferabbly uns10276 for your application due to the nickel content of hastelloy being higher in hastelloy. SS316L will do okay as well, but for critical application and longetivity of the project, you must go for hastelloy.

    Jay Mehta, Kinnari Steel