VM 25 75

VM 2575.png

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.

​APPLICATIONS

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.

​PERFORMANCES

VM 25 75 has been tested from room to high temperature for SCC and SSC with different levels of H2S.​

​Typical Chemical co​mposition

UNS​CCrNiMoNPRE​
S312600,003 max​24 - 265.7 - 7.52.5 - 3.5​0.1 - 0.3≥ 37.5

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

D​ensity = 7.85kg/dm3

MECHANICAL PROPERTIES 

​After cold work

​​Yield Strength 

Ksi (​MPa)​

​​Ultimate Tensile

Strength ksi (MPa)  

​Elongation
​%   
Mean ​Hardness
HRC 

​​​Min.

​Max.

​​Min.​

​ Min.

​ Max.

75 (517)100 (689)90 (621)25%​​26

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)
1000" and above
(25.40mm and above)

​​3.0

4.0​5​.06.0​​6.0

​PHYSICAL​ PROPERTIES

Physical properties & ​evolu​tion with temperature​

Characteristic ​​Unit ​​Tem​perature (°C) ​ ​ ​ ​ ​
25​50100150200250
Yield Strength
derating
%​1.0000.9430.8710.8190.7810.751
Ultimate Tensile Strength
derating
%1.0000.9720.9320.9020.8800.862
Thermal conductivityW m-1 K-1​ 14.6215.1116.1516.9017.3318.10
Thermal diffusivityx 10-6 m²s-13.873.924.034.134.244.35
Thermal expansionx 10-6 / deg. C-13.113.213.413.513.7
Poisson's ratio-​      
Young's modulusG​Pa200.0198.4195.0191.8189.4185.4
Resistivitynano Ohm.m861880​9139459781011
Specific heat capacityJ.g-1.K-10.490.500.520.530.530.54​​​​​​

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​​.

 
 

Brochu​​res​​​

OCTG Product Selection Guide​​​​​​​​

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