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.