VM 95 13CRSS


VM 95 13CRSS is a super martensitic OCTG steel (also called Super 13%Cr steel) for sweet wet CO2 corrosive environments. It is manufactured in accordance with latest edition of API 5CRA an​d ISO 13680 – PSL 1. VM 95 13CRSS offers corrosion and SSC resistance on a greater usage domain than API L80-13CR in terms of temperature, H2S and Chloride contents. VM 95 13CRSS is also available with High Collapse performance (VM 95 13CRSSHC).


  • Deep and/or HP/HT production tubing ​and liners exposed to flowing effluents containing CO2
  • For temperatures up to ~180°C (356°F)
  • For limited amount of H2S
  • Finer grade selection shall take into account other parameters such as Chloride content and in-situ pH.


OCTG carbon steels are known to corrode when exposed to wet CO2 containing environments. They will suffer from various forms of corrosion such as general metal loss corrosion or localized corrosion (pitting, crevice, Mesa attack).

Martensitic and Super martensitic steels hav​e proved to be the most cost e​ffective solution to protect against wet CO2 corrosion in oil & gas wells.


   ​Comparison of Cost vs time for Carbon steel + inhibitors (+ workovers) and for 13%Cr steel in wet C02 well​

VM 95 13CRSS offers corrosion and SSC resistance on a greater usage domain than API L80-13CR in terms of temperature, H2S and chloride contents, as shown on the graphs below:​​


Corrosion resistance of Super 13Cr vs API L80-13Cr as a function of temperature and chloride content​​

Resistance to SSC (Sulfide Stress Cracking)

The SSC resistance of VM 95 13CRSS grade has been checked and qualified according to NACE TM 0177 standard - method A (tensile test) and C (C-ring). Data obtained by the Vallourec Research Centre (VRA) are available upon request and demonstrate following threshold stresses:

​​Grade ​Test conditions Threshold stress
V95 13CRSS 1.5​ psi of H2S in CO2 ≥ 80% SMYS f​or standard   s​pecimens
at pH = 4.5 with 10 g/l of N​aCl ≥ 72% SMYS for subsize specimens​​


Yield Strength 
ksi (MPa)

Strength ksi (MPa)
HRC​​ ​

Young Modulus (GPa)

Min. Max. Min. Min. Mean Max. Min. Max.
95 (655)  110 (758)   105
API 5CRA formula 28 ​30 170 230
Charpy ​V-notch ​Impact test at -10°C (14​°F)​​​
Direction​ Absorbed energy on a 10x10 mm specimen
Transverse 60 ft.lb (80 J)
Longitudinal​ 74 ft.lb (100 J)


The product is used in the following area:

  • North Sea & Europe: 4 1/2" to 7"; 12.6# to 32#; VAM​ TOP® series.
  • Africa: e.g. 3 1/2" to 7"; 9.2# to 32#; VAM​ TOP® series.
  • Asia: e.g. 5" to 7"; 23# to 32#, VAM​ TOP® series.
  • Middle East: e.g. 3 1/2" to 9 5/8"; 9.2# to 53.5#; VAM​ TOP® series.
  • South America: e.g. 4 1/2" to 10 3/4"; 12.6# to 60.7#; VAM​ TOP® series, VAM® 21TM, VAM® FJLTM, VAM® SLIJ-IITM.​


  • Avoid pollution by contact with carbon or low alloy steel (pipe or parts).
  • Avoid atmospheric pollution with iron (e.g. concrete plant).
  • Perform proper cleaning and inspection after rig returns (potential impact of completion fluid).
  • Please refer t​o the VAM® BOOK and Vallourec recommendations for more details on storage, handling, transportation and running of Super 13%CR pip​e.