Super 25 Chrome

Also Known As

• Super Duplex 25 Chrome
• Super Duplex
• 25Cr Super Duplex
• 25CRW
• Super 25Crw
• SM25CRW®
• VM® 25S
• SAF 2507®
• Duplex 2507
• ZERON® 100
• Z100
• F55
• F53
• W.Nr. 1.4501

Suitable Applications

Mildly sour environments containing the presence of high chlorides with partial pressure of H2S ≤ 3 psi

As tubing and liner in seawater and water injection wells

Heat exchangers, tubes, and pipes for midstream / downstream oil and gas

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

Super 25 Chrome

UNS32750 • UNS S32760 • UNS S39274 | Datasheet

25CRS Applicable EnvironmentsSuper Duplex 25 Chrome grades, 25CRW & 25CRS, are cold hardened duplex stainless steels intended for corrosion resistance in sweet (CO2) and moderately sour (H2S) environments with high chloride content, requiring high strength up to 450°F.

The “Super” designation indicates that it has a Pitting Resistance Equivalence (PREN) ≥40. This provides increased resistance to H2S and localized corrosion from high chlorides and/or oxygen relative to standard 25 Chrome. It is therefore a common choice for use as tubing and liner in seawater and water injection wells. However, all environmental factors, including H2S, CO2 , temperature, pH, and chloride concentration, should be considered before final material selection.

These alloys are classified in MR0175/ISO15156 as duplex stainless steels having a Pitting Resistance Equivalent Number ≥40, suitable for H2S partial pressure ≤3.0 psi.

Chemical Composition

 CCrNiFeMnSiMoCuPSWN
UNS S32750≤ 0.0324 - 266 - 8BAL≤ 1.2≤ 0.83 - 4-≤ 0.035≤ 0.02-0.24 - 0.32
UNS S32760≤ 0.0324 - 266 - 8BAL≤ 1≤ 13 - 40.5 - 1≤ 0.03≤ 0.010.5 - 10.2 - 0.3
UNS S39274≤ 0.0324 - 266 - 8BAL≤ 1≤ 0.82.5 - 3.50.2 - 0.8≤ 0.03≤ 0.021.5 - 2.50.24 - 0.32
(mass %)

Manufacturing Process

PROCESSDESCRIPTION
Steel MakingMade by electric furnace process or blast furnace followed by Vacuum Oxygen Decarburization (VOD) process or Argon Oxygen Decarburization (AOD) Process
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 2 Category 25-7-4 
GradeYield
Strength
ksi
Tensile
Strength
ksi
Elongation
%
Hardness
HRC
NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
80801051102028Table A.24
(annealed)
H2S ≤ 3.0 psi,
Temp ≤ 450°F
90901051152030
1101101401251236Table A.24
(cold-worked)
H2S ≤ 3.0 psi,
Cl ≤ 120g/l
1251251451301036
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/in30.28
Thermal ExpansionX10-6/°F7.57.57.5
Elastic Moduluspsi x 1062928.227
Poisson Ratio0.240.240.24
Thermal ConductivityBtu/ft h °F8910
Specific HeatBtu/lb °F0.120.120.12

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