9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
(OP)
A part was submitted to our lab that was fabricated from 9Cr1Mo that was in an acidizing well environment (HCL was present, exact concentration or buffer unknown, no info on possible H2S) with a temperature around 275 F. The part exhibits massive corrosion as expected.
The 9Cr1Mo is a quasi stainless, but how would the corrosion resistance (mm/year) of the 9Cr (yield =95 KSI) compare to 13Cr/420 (yield=95 KSI) and 25Cr Duplex (yield=95 KSI) in an environment of X% HCl ph=3.5, at 275 F?
I have a broad background in Carbon steels, but my background with stainless is limited as confirmed with my novice question. I understand the formation of Cr oxides which improve corrosion resistance, and the importance of the PREN number, but what other factors should I be studying to improve my general knowledge of stainless alloys applications pertaining to corrosive environments?
The 9Cr1Mo is a quasi stainless, but how would the corrosion resistance (mm/year) of the 9Cr (yield =95 KSI) compare to 13Cr/420 (yield=95 KSI) and 25Cr Duplex (yield=95 KSI) in an environment of X% HCl ph=3.5, at 275 F?
I have a broad background in Carbon steels, but my background with stainless is limited as confirmed with my novice question. I understand the formation of Cr oxides which improve corrosion resistance, and the importance of the PREN number, but what other factors should I be studying to improve my general knowledge of stainless alloys applications pertaining to corrosive environments?





RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
The 25Cr duplex will be much better in acids, even more so if any chlorides are present.
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Plymouth Tube
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
I am a bit intrigued as to why you would be interested in the corrosion resistance of 9Cr1Mo. This material is principally used in the power generation industry because of its improved creep resistance over conventional austenitic and martensitic steels at specific temperatures relative to base cost.
certainly in the power industry, it is not being considered as a replacement to other materials based on corrosion resistance.
If you google AD700, you will see where I am coming from.
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
The oxygen can be very important.
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Plymouth Tube
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex
I always enjoy your comments on stainless. Your correct the application is for oil field work.
Guys,
Thanks for your input as well.
RE: 9Cr1Mo corrosion resistance versus 13Cr/420 or 25Cr Duplex