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


If hydrotesting induces cold deformation, is this acceptable as per NACE MR0175?

Viewed 1941 Times


In order to decrease the danger of low stress creep we slightly overstress superaustenitic SS and Ni-based alloy valve bodies during hydrotesting. This overstressing causes a “cold deformation” of 0.2-0.5%. We do not use the cold deformation in order to enhance the mechanical properties! Is this practice allowed under the rules of NACE MR0175/ISO 15156 ?


Hydrotesting the austenitic stainless steels to the appropriate industry or design code is acceptable.

This question is in relation to NACE MR0175/ISO 15156-3 A.3 and A.4

Reference: ISO 15156 Maintenance Panel Inquiry #2003-28 Q2


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