VM 50 ET

VM50 ET.jpg 
VM 50 ET is a martensitic steel grade that offers high Expansion Ratio and that is suitable for sour service environment (low H2S).

Manufactured in accordance with latest edition of API 5CT and ISO 11960 – PSL-2 specifications (group 2 – L80) this material is suitable for Expandable application with Expansion Ratio (ER) up to 25%.

SSC resistance is guaranteed by C-ring​ tests performed according to NACE TM0177 standard at 100 % actual YS on inner fibber.


Its primary applications are casing and liner extensions or zonal isolation with temporary exposure to production fluids. It will be used in low H2S environment (with T°) and where expansion ratios are not greater than 25 %.

Post expansion application will depend of CO2, temperature, pH and chloride content.


Yield Strength 

ksi (​MPa)​

​Ultim​ate Tensile

  ​ Strength ksi (MPa)  





​ Min.

​ Min.



For VM 50 ET, Vallourec recommends all storage rules specific to martensitic steels, in particular:

  • Away from pollution sources  such as metallic powder, sea spray and standing water
  • In a covered and dry place and such as any metallic contact is avoided.

Handling ru​les are those applicable to any Vallourec Expandable grade:

  • Any sling marks shall be avoided on pipe surface
  • ​Pipes shall be stored in layers with wood beams separators.