Tag: tantalum bolts for hydrochloric acid

Tantalum Screws for Hydrochloric Acid Resistance

Q: We currently use Titanium screws, and I would like to know pricing and lead time to replace them with Tantalum screws to improve their resistance to HCL.
A: What concentration and temp are you at with the HCl?  See the HCl Iso-Corrosion curve for Hastelloy C276.  Tantalum screws will definitely work in your application but may be overkill considering titanium is not very corrosion resistant against HCl. Depending on your applications temperature and concentration have you considered Hastelloy C276 screws? See the chart below. If you are below the 5mpy (mills per year 0.001″) the C276 fasteners should serve you well. If not, tantalum screws may be where you need to be.

Tantalum Bolts vs Polymer Bolts for HCl

Q: We have on application in one HCL tank and we are using hastelloy bolts but they are not efficient. So I ask the quotation for material tantalum in metals or other material like PEEK, please advise what is the better solution.

A:  It depends on the temperature of the HCL and the load the bolts will need to handle. Tantalum bolts are the best material for HCl at elevated temperatures however it is very expensive. Depending on the load and temperature a polymer like PVDF bolts may work.