CRA Inconel 625 vs Incoloy 825
CRA Inconel 625 vs Incoloy 825
(OP)
For sour gas plant, which material is preferable, Inconel 625 or Incoloy 825?
Some project specify Inconel, and other specify Incoloy
Anybody can advise what are their advantage and limitation? Which material to be used in what condition?
Also in terms of price and availability, which one is better?
thx
Some project specify Inconel, and other specify Incoloy
Anybody can advise what are their advantage and limitation? Which material to be used in what condition?
Also in terms of price and availability, which one is better?
thx





RE: CRA Inconel 625 vs Incoloy 825
RE: CRA Inconel 625 vs Incoloy 825
RE: CRA Inconel 625 vs Incoloy 825
Very different high temperature strength and corrosion issues with the two alloys.
In my experience unless the high temp strength is an issue 625 is not your best option. There are similarly priced Ni alloys with better corrosion resistance, and there are high Cr SS grades that are not far below.
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Plymouth Tube
RE: CRA Inconel 625 vs Incoloy 825
1. CS + 3mm CA
2. CS + 6mm CA
3. SS 316
4. Duplex
5. Super duplex
6. Inconel 625
Currently (another project)... the spec are only
1. CS + 3mm CA
2. SS 316
3. Incoloy 825
Which one will be more cost effective?
RE: CRA Inconel 625 vs Incoloy 825
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Impossible to answer with any degree of accuracy.
p.s., the word would be 'severity'
RE: CRA Inconel 625 vs Incoloy 825
It has low strength and mediocre corrosion resistance.
In many cases a higher alloy product (2205) will be much less expensive.
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Plymouth Tube
RE: CRA Inconel 625 vs Incoloy 825
Weko,
You will select the material according to the gradation of 'severity' as defined by the documentation that listed the possible materials. Some end users are happy with ISO 15156, some end users relax ISO 15156 for some materials and tighten it for others.
For a start, you cannot compare the carbon steel plus corrosion allowance with the CRA materials since it will corrode thereby incurring operational expenditure for integrity status verification (it will also require painting)!! On the other hand, the CRAs could be prone to types of cracking that the carbon steel is not. This will negate the simplicity of a direct capital expendure comparison.
The optimum material will be the one offering the best lifecycle cost for an acceptable corrosion risk, unless (as is usually the case), lowest CAPEX has been stipulated as the evaluation criterion; in which case, good luck!
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: CRA Inconel 625 vs Incoloy 825
For Steve Jones.
Currently, I work in an EPC contractor. Most of the project tenders here, does only looks at the lowest EPC cost (starting cost). Thats why we mostly compare the "cost" of CS+CA to CRA material.
RE: CRA Inconel 625 vs Incoloy 825
Weko, we use a lot of carbon steel with corrosion inhibition in our sour gas plants, no exotics.
RE: CRA Inconel 625 vs Incoloy 825
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04