VM 25 75 is a Corrosion Resistant Alloy. It is iron based plus main alloying elements Cr, Ni and Mo. The PRE is above 37.5. Structure is Duplex (austenite and ferrite). VM 25 75 is delivered in solution annealed condition.
VM 25 75 is recommended when pCO2 is above 2psi / 0.14bar with chlorine. Acceptable temperature is up to 450°F / 232°C. Some partial pressure of H2S is acceptable depending on temperature of use.
VM 25 75 can be used as tubing or casing.
VM 25 75 has been tested from room to high temperature for SCC and SSC with different levels of H2S.
Typical Chemical composition
PRE=Pitting Resistance Equivalent = %Cr + 3.3 %Mo + 1.65 % W + 16 % N
Density = 7.85kg/dm3
After cold work
Strength ksi (MPa)
Control hardness through wall
Physical properties & evolution with temperature
Avoid pollution by contact from carbon or low alloy steel (pipes or parts).
Avoid atmospheric pollution with iron (e.g. concrete plant).
Please refer to the VAM® BOOK.