VM 25S 140

​​VM25S140.png

Super Duplex VM 25S 140 is a Corrosion Resistant Alloy. It is called "Super Duplex" because of its improved corrosion resistance to H2S. It is iron based plus main alloying elements Cr, Ni and Mo. The PRE is above 40. Structure is Duplex (austenite and ferrite). VM 25S 140 is delivered in cold work condition. It can be hardened by drawing or pilgering.

APPLICATIONS

VM 25S 140 use is recommended pCO2 is above 2psi / 0.14bar and high temperature up to 482°F / 250°C. Chlorine is limited to 120000ppm. It can be used with some amount of H2S (3psi – 0.2bar). Partial pressure H2S acceptable is governed by temperature.

VM 25S 140 can be used as tubing or casing.

​PERFORMANCES

VM 25S 140 has been tested from room to high temperature for SCC and SSC with different levels of H2S.​

​Typical Chemical composition

UNS​CCrNiMo

 N

 PRE

S32760​0,03 max24 - 266 - 83 - 4​0.2 - 0.8≥ 40

​PRE=Pitting Resistance Equivalent = %Cr + 3.3 %Mo + 1.65 % W + 16 % N

D​ensity = 7.82kg/dm3

MECHANICAL PROPERTIES 

​​In solution annealed condition

Yield Strength
ksi (MPa)
Ultimate Tensile Strength
ksi (MPa)
Elongation
%
Mean Hardness
HRC
Min.Max.Min.Min.Max.​​
140 
(965)
160 (1103)​
145 (1000)​
9%38

Control hardness through wall   ​

​Less than 0.357"
(Less than 9.00mm)
​0.354" to ​0.499"
(9.00 to 12.69mm)
​0.500" to ​0.759" 
​(12.70 to 19.04mm)
​​0.750" to 0.999"
(19.05 to 25.39mm)
1.000" and above
(25.40mm and above)

​3.0

3.0

​4​.0​

5.0

6.0​​​

PHYSICAL PROPERTIES

Physical properties & ​evolution with temperature


Characteristic ​​
Unit ​​Tem​peratu​re (°C) ​ ​ ​ ​ ​
25​50100​150200​ 250
Yield Strength
derating
%​1.0000.9670.9210.8870.8610.841
Ultimate Tensile Strength
derating
%1.0000.9720.9320.9020.8800.862
Thermal conductivityW m-1 K-1​14.3714.6614.9717.1517.8018.44
Thermal diffusivityx 10-6 m²  s-13.683.763.924.094.254.42
Thermal expansionx 10-6 / deg. C-13.213.413.513.713.9
Poisson's ratio-​      
Young's modulusGPa188.9 187.2184.2181.2177.9175.1​​
Resistivitynano Ohm.m89691294397310041034
Specific heat capacityJ.g-1.K-10.500.500.490.540.540.54​​​

STORAGE & HANDLING RECOMMENDATION

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​.​​