×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

What beats hastelloy for sulphuric resistance?

What beats hastelloy for sulphuric resistance?

What beats hastelloy for sulphuric resistance?

(OP)
This is a goofy way to state the question but I’m getting one of our hastelalloy C276 nozzles analyzed for corrosion mechanisms, validation of material, and to hopefully get some directions on ways to limit the component mtbf.

The service is 2000 F SO2 into a quenching unit. The theoretical chemistry our refractory company has is that sulphuric acid forms and attacks the nozzle when eddy currents push it back up into the nozzle. There are also thoughts that carryover sulfur quickly removes the oxidation layer preventing any meaningful component lifetime. Since this is a high temp, high flow, sulphuric service I can’t for the life of me find any materials outside of maybe C-22 that might be comparable. We’d be willing to spend 3-4x the cost of the nozzle on a custom solution if there is one.

The issue is that as this nozzle abrades the refractory is directly attacked leading to a 4 month nozzle replacement and rebuild period. Curse the engineer who made this degenerate process but has anyone had experience with finding a big brother to c276?

RE: What beats hastelloy for sulphuric resistance?

If the theory about eddy currents is correct then possibly a different geometry could prevent the upstream flow.

RE: What beats hastelloy for sulphuric resistance?

2000 degrees? Have you not considered ceramics?

RE: What beats hastelloy for sulphuric resistance?

Ceramic is the way to go.
I would talk to Blasch and CoorsTech.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: What beats hastelloy for sulphuric resistance?

(OP)
We already utilize a SiC ceramic that’s set in place by a cad table pour. This nozzle is used to direct the flow and sits inside that ceramic.

Im not sure on the reason behind us not using a ceramic for the nozzle itself, it might be that we either couldn’t find a way to tie the ceramic into the rest of the system or there was too much vibration and the ceramic would fail early on.

The specification for a metal nozzle was originally done by the refractory/burner company. I don’t know if we can easily trial other options since a release in that section could be catastrophic. I wanted to look into C-22, C-2000, BC1, etc but the corrosion effects at high temperature aren’t well understood

RE: What beats hastelloy for sulphuric resistance?

I agree ceramic could be the way to go.
Among the elite C alloys I would prefer Alloy 59 for its better stability.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close