+44 (0) 114 4000850   |   US toll-free 877-399-1010


What are the NACE MR0175 requirements for expansion joints and flexible hoses in austenitic stainless steel?

Viewed 3751 Times


We’re a manufacturer of expansion joints and flexible hoses and since we get more and more often inquiries regarding bellow according to MR0175 we purchased a copy of this standard some time ago. Since our bellows standard material is austenitic stainless steel, we paid particular attention to Table A.2 (attached) where there some notes about cold work and maximum hardness. Our understanding of these notes is that to meet this particular requirement we have to perform a heat treatment of the bellows after cold forming and to check the maximum hardness to be not higher than 22 HRC. Could you please tell me if our understanding is correct or what is the right method to follow to satisfy the requirements of MR0175 when the subject is cold formed bellows?


Table A.2 is applicable to austenitic stainless steels used for ANY components. There may be other applicable tables depending on the end use of the bellows (e.g. Table A.7 for gas lift service).
If Table A.2 is the applicable table, the requirements for material conditions, hardness limit and cold forming are stated in A.2.
The MP is restricted to providing interpretations of the standard’s requirements and may not provide direction beyond this scope.

This question is in relation to NACE MR0175/ISO 15156-3 Table A.2 (cold work)

Reference: ISO 15156 Maintenance Panel Inquiry #2012-03


With a wealth of experience in the oil and gas industry, we provide independent materials and corrosion consultancy to help companies reduce risk, save money and apply best practice in their oil and gas businesses.

Find out more by getting in touch – you’ll get an answer from a qualified, experienced materials engineer every time.


USA toll-free


US: 877-399-1010 (toll free)
UK: +44(0)1144000850

66 Eldon St
S1 4GT
United Kingdom



Was this answer helpful ? Yes / No