2535

Also Known As

• CRA 2535E
• SM2535®
• 25%Cr-35%Ni
• 25 CR35 Ni

Suitable Applications

Corrosive environments containing high levels of CO2 , H2S, and chlorides

High-pressure, high-temperature (HPHT) sour wells

Acid gas injection wells

Product Availability

FORMS:
Seamless Pipe, Tubing

OD:
MIN OD: 2-7/8”
MAX OD: 10-3/4”
Standard & Non-Standard Sizes Available

RANGE:
R1, R2, R3, Lengths up to 70'

2535

UNS N08535 | DATASHEETS: 2535CRA 2535E

2535 Applicable EnvironmentsAlloy 2535 (UNS N08535) is a cold hardened nickel-based alloy intended for corrosion resistance in highly sour (H2S) environments with moderate chloride content, requiring high strength up to 350°F. 2535 offers increased resistance to the effects of H2S relative to stainless steels allowing its use as downhole tubular components, packers, and other subsurface equipment in sour wells with high-pressure and high-temperature (HPHT) conditions and Acid Gas Injection (AGI) wells. However, all environmental factors, including H2S, CO2 , temperature, pH, and chloride concentration, should be considered before final material selection.

UNS N08535 is classified in MR0175/ISO15156 as a type 4c alloy, with no restrictions to a partial pressure of H2S below 270°F and resistant to 200 psi H2S at 350°F.

CRA 2535E

CRA 2535E (UNS N08535) is a premium, electro-slag re-melted version of alloy 2535. The performance and consistency are enhanced through tightly controlled compositional limits and microstructural cleanliness.

Chemical Composition

CCrNiNi+CoFeMnSiMoCuPS
≤ 0.0324 - 2729 - 36.5≥ 29.5BAL≤ 1≤ 0.52.5 - 4≤ 1.5≤ 0.03≤ 0.03
(mass %)

Manufacturing Process

PROCESSDESCRIPTION
Steel MakingMade by electric furnace process followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD)
Pipe MakingManufactured by traditional tube manufacturing processes, High strength tubulars should be furnished in cold worked condition
Heat TreatmentSolution Annealing Process before final cold drawing

Specified Mechanical Properties

API 5CRA / ISO 13680 Group 3 Category 25-32-3
GradeYield
Strength
ksi
Tensile
Strength
ksi
Elongation
%
Hardness
HRC
NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
1101101401151133Table A.14
Type 4c
No limit ≤ 270°F,
Refer to table for temperatures up to 450°F
1251251501301035
140140160145938140 Grade not recommended for sour service
*Non-standard mechanical properties and grades are made available upon agreement.

Typical Physical Properties

  70°F200°F400°F
Densitylbs/in30.290.290.29
Thermal ExpansionX10-6/°F8.38.38.4
Elastic Moduluspsi x 10628.327.626.3
Poisson Ratio0.290.290.29
Thermal ConductivityW/ft h °F566.4
Specific HeatBtu/lb °F0.090.090.09

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