Nickel Alloy: 2550E

CRA 2550E (UNS N06255) is a premium melted, cold worked nickel-based alloy meeting the severe challenges of wells containing high chlorides, H2S and temperature. With a typical Pitting Resistance Equivalent Number of 52, it is highly resistant to pitting corrosion and chloride-induced stress corrosion cracking. For sour service applications, it is classified in MR0175/ISO15156 as a type 4d alloy, with no restrictions to partial pressure of H2S below 300°F and resistant to 300 psi H2S at 425°F. CRA 2550E-140 C-rings tested at 100% AYS in 15.5 ppg ZnBr2/CaBr2/CaCl2 brine exhibited no evidence of cracking. Tests were performed under three conditions: • 1.5 psi H2S / 500 psi CO2 / 350°F • O2 saturated / 425°F • 500 psi CO2 / 425°F CRA 2550E has excellent hydrogen embrittlement resistance at all standard strength levels.

Corrosion Resistance

Extreme

Alloy Group

Nickel Alloy

Yield Stregth

110 - 160

Wall Tolerance

0.875

Pren

42.80 - 60.65

Element Composition

El.
Min:
Max:
C
×
0.03%
Cr
23%
26%
Ni
47%
52%
Mo
6%
9%
Cu
×
1.2%
Ti
×
0.69%
W
×
3%
Si
×
1%
Fe
6.02%
24%
Mn
×
1%
P
×
0.03%
S
×
0.03%

Alloy Files

CRA-2550E-Datasheet.pdf
PDF
Alloy Products
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