CRA 2550E Data Sheet .pdf

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Original filename: CRA 2550E Data Sheet.pdf
Author: Jessica Badger

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CRA 2550E
NOMINAL COMPOSITION
Chromium 25% Nickel 50% Molybdenum 6% Tungsten 1.5% Iron Balance
CRA 2550E (UNS N06255) is a 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 300F and resistant to 300 psi H2S at 425°F.

STANDARD STRENGTH CLASSIFICATIONS
Yield Strength
Yield Strength
Tensile Strength
min. (ksi)
max. (ksi)
min. (ksi)
110
140
115
125
150
130
140
160
145
*NACE MR0175/ISO 15156 limits maximum yield strength to 150 ksi

Elongation
min. (%)
11
10
9

NACE MR0175/ISO 15156
Compliant
YES
YES
NO*

TYPICAL ELEVATED TEMPERATURE TENSILE PROPERTIES OF 2550E-125
Longitudinal
Temperature
70°F
250°F
350°F
450°F
550°F

Yield Strength
ksi (MPa)
134 (924)
118 (814)
117 (807)
116 (800)
112 (772)

Transverse

Tensile Strength
ksi (MPa)
139 (958)
122 (841)
120 (827)
119 (820)
117 (807)

Yield Strength
ksi (MPa)
123 (848)
116 (800)
114 (786)
113 (779)
112 (772)

Tensile Strength
ksi (MPa)
140 (965)
130 (896)
127 (876)
126 (869)
122 (841)

TYPICAL CHARPY V-NOTCH PROPERTIES OF 2550E-125
Temperature
-75°F
-75°F
-75°F
14°F
14°F
14°F

Orientation

Location

Transverse (C-L)
Transverse (C-L)
Transverse (C-L)
Transverse (C-L)
Transverse (C-L)
Transverse (C-L)

Mid-Wall
Mid-Wall
Mid-Wall
Mid-Wall
Mid-Wall
Mid-Wall

Ft-lbs (Joules)
118 (87)
117 (86.5)
116 (86)
125 (92)
120 (89)
126 (93)

Average Lat. Exp. (mils)
71
72
71
56
49
53

Density
Thermal Expansion
Elastic Modulus
Poisson Ratio

3

lbs/cu .
X10-6/deg F
psi x 106

70⁰F

250⁰F

350⁰F

450⁰F

0.297
28.5

0.296
7.2
27.9

0.295
7.4
27.8

0.294
7.7
27.6

0.29

0.29

0.29

0.3

Corrosion Resistant Alloys
www.cralloys.com


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