HCl Application
HCl Application
(OP)
Does anyone has a literature for high temperature hcl application?
A:Temp: 400ºC to 600ºC ; B:Max Pressure = 5Bar ; C: corrosive internal condition : gas of 5%HCl- Water – Hydrogen
I try to select correct material but for such elevated tempratures, I could not find any source.
A:Temp: 400ºC to 600ºC ; B:Max Pressure = 5Bar ; C: corrosive internal condition : gas of 5%HCl- Water – Hydrogen
I try to select correct material but for such elevated tempratures, I could not find any source.





RE: HCl Application
What is this application?
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: HCl Application
RE: HCl Application
RE: HCl Application
What about Hastelloy?Do you have any experience?
RE: HCl Application
http://www.stainless-steel-world.net/pdf/10020.pdf...
RE: HCl Application
RE: HCl Application
Did you try with carbon and antiacid ceramic bricks? .But nozzles will be a problema, graphite made, perharps?.
There was an old company, may be is not active nowadays, that is why a write the name (Keramchemie).Those were working with HCL 5% but 200°C as I know.The problem is the resin able to support 600°C to fix the bricks.Perhaps you can get some information from Steuler KCH.
Regards
Luis
RE: HCl Application
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: HCl Application
With no condensation it is a lot like handling wet chlorine.
Alloys such as 600 and 825 (both over 21% Cr) can be used in this service.
I know that both 310 and S28 (25% Cr) are used in liquid HCL service, I couldn't find any high temp data offhand.
Do you know the actual amount of water in this system?
The corrosion rates will not be zero. You will be picking up some Ni in the solution.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: HCl Application
We would operate under a partial pressure to reduce the boiling point otherwise the temperature would be simply too much for the glass - which I believe can withstand up-to 200°C.
The re-boilers were steam bayonets made from tantalum. If you need a metal that can withstand high temp, high corrosive (HCl) conditions then I recommend tantalum (but it isn't cheap!!)
RE: HCl Application
what would be the consequences of condensation?
RE: HCl Application
RE: HCl Application
could you compare C276 and Alloy 625?
Could we say C276 is superior to 625?
RE: HCl Application
RE: HCl Application
Acc. to Haynes website, as concentration of HCL increases, c276 has better corrosion rate than 625.
Any final comments?
RE: HCl Application
Will C276 give adequate resistance to your the hot, dry conditions? That depends on how much HCl is present in the stream on average and in peak, how hot the metal gets (including any localized hot-spots), how the equipment is fabricated and annealed, as well as what else is in the stream, whether the conditions cycle between oxidizing and reducing, and many other factors.
So, let's say we're talking about some application that makes hot, dry HCl and then quenches it with water or an alkaline solution in a scrubber of some sort. You would typically see something like 600 or 625 in the hot parts, then a transition to C276 or another C alloy just above the quench.
If this really matters, get the advice of a professional corrosion service metallurgist- don't try to make the selection based on the advice of people providing advice for free on an internet forum, as smart as they may be! And while people like Haynes and other manufacturers can be a useful source of information if properly used, they are obviously subject to bias toward what they sell.
RE: HCl Application
You are right however this is not for an application in my country and I am afraid no pro-metallurgist in my country can comment even close to what you write. Appreciate your input and experience !
RE: HCl Application
1.normal 625 is solid solution hardenable.
2.custom age 625 plus is precipitation hardenable, high strength can be obtained by aging without prior warm or cold working. this is important in appications where large-section size precludes warm working.
3. custom age 625 plus high strength
RE: HCl Application
If your condition is more of reducing, you may want to try Hastelloy B-2 wiht very high Mo, and only 1% Cr. this alloy is not good at oxidizing media.
RE: HCl Application