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


In NACE MR0175, what is the API 5CT L-80 Type 13Cr hardness limit?

Viewed 4802 Times


Is the maximum hardness limit for ISO 11960 L-80 Type 13 Cr tubing used as a downhole tubular component, packer, and other subsurface equipment in accordance with NACE MR0175/ISO 15156 the maximum hardness as specified in the latest edition of ISO 11960? Note: ISO 11960 is also designated as API 5CT. Note: ISO 11960 currently specifies 23 HRC as the maximum hardness for L-80 Type 13 Cr tubing. Discussion: NACE MR0175/ISO 15156-3, Table A.19 lists ISO 11960 L-80 Type 13 Cr and two other materials as begin acceptable for “downhole tubular components, packers, and other subsurface equipment.” There are notes in this table that specify the maximum hardness limits of the other two materials, individually. However, there is no note to specify the maximum hardness limit of ISO 11960 L-80 Type 13 Cr tubing. This seems to indicate that ISO 11960 becomes the controlling document for L-80 Type 13 Cr, and therefore the maximum hardness for ISO 11960 L-80 13 Cr tubing is currently 23 HRC as specified in Table C.6 and Table E.6 of ISO 11960.


Your interpretation is correct.
As a general rule during the preparation of ISO 15156, the unnecessary repetition of information provided in cited sources was avoided.

This question is in relation to NACE MR0175/ISO 15156-3 A.6.2, Table A.19

Reference: ISO 15156 Maintenance Panel Inquiry 2006-03


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