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 and 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).
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 have proved to be the most cost effective 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:
Yield Strength ksi (MPa)
Yound Modulus (GPa)
The product is used in the following area: