Inconel X750 or 1095 steel that has been spring tempered

[kiwioil]

Does anybody know of some good research material on the effects of H2S and CO2 on Materials such as Inconel X750 or 1095 steel that has been spring temered,.
A friend is developing a tool that has belly springs on it and is trying to spec out a good material and temper to have it last as long as it can in wells up to 16% H2S and CO2.

 

[NickE]

The 1095 will fail utterly and very quickly when stressed as a spring in that type of environment esp if wet. Possibly more due to the CO2. Spring strip of 1095 steel is great but corrodes incredibly fast.

Not too sure bout teh x750, I remember a thread w/ the S-Ni phase diagram that had a temperature region to avoid cause of solubility.

Ahhh-Ha Found it:

http://cyberbuzz.gatech.edu/asm_tms/phase_diagrams/pd/ni_s.jpg

theres the phase diagram, I think that the eutectic at ~21wt% is what may be of interest. There's not too much that Ive found on x750 either. Unique (at least to me) heat treat thou.

Nick

 

[TVP]

As NickE stated, SAE 1095 is not suitable for use in H₂S environments. Nickel alloys can be used, usually with some restrictions. Cheeck out the following Eng-Tips threads for more information:

thread408-54550

thread338-83564

Also, Special Metals, the producer of Inconel X-750, has technical information available on their website. The following link didn't have much on H₂S service, but you may be able to find more by snooping around or by contacting them directly:

http://www.specialmetals.com/documents/Inconel alloy X-750.pdf

 

[metengr]

I don't believe the Inconel X-750 would be an acceptable choice for this particular application. Because of the strength level required for the spring temper, I would be very concerned about the potential for SCC based on the limited amount of technical literature I have seen regarding nickel-base alloys in a hydrogen sulfide environment.

I agree with others regarding the use of 1095.