NACE MR0175 - Understanding The Requirements 1

[AFG03082015]

Hello,

Just wanted to check my understanding of NACE MR0175 correctly.

Am I right in saying NACE MR0175 is for materials to be used in sour environments that make the material susceptible to suplhide stress corrosion cracking?

Therefore, considering 17-4PH Precipitation Hardened Stainless Steel for example, the steel must have a Hardness limit of 33 HRC Age hardening at 620°C. This limit on the hardness therefore limits the materials susceptibility to stress corrosion cracking?

 

[SJones]

Yes you are right, amongst several other cracking mechanisms.

S17400 will be required to have a specific solution anneal followed by a double ageing, or modified double ageing, treatment.

Compliance gives some assurance of resistance to sulphide stress cracking/stress corrosion cracking, but it does not guarantee immunity.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.