25CR

25 Chrome

UNS S31260

COMMON TRADE NAMES: 25 Chrome Duplex, 25Cr, SM25CR®, VM® 25, 2507, Duplex 2507

25 Chrome Applicable Environments25 Chrome (UNS S31260), also referred to as 2507 Duplex or Duplex 25 Chrome, is a cold hardened duplex stainless steel intended for corrosion resistance in sweet (CO2) and mildly sour (H2S) environments with high chloride content, requiring high strength up to 450°F.

25 Chrome offers increased resistance to the effects of CO2 , chlorides, pH, and temperatures relative to 22 Chrome allowing use as downhole tubular components, packers, and other subsurface equipment in deeper wells with high-pressure and high-temperature (HPHT) conditions where pitting corrosion from high chlorides are a concern.

This alloy is classified in MR0175/ISO15156 as a duplex stainless steel having a Pitting Resistance Equivalent Number ≤40, suitable for H2S partial pressure ≤0.3 psi.

Applications in Upstream Oil & Gas

  • Corrosive environments containing the presence of CO2, low H2S, and chlorides
  • High-pressure, high-temperature (HPHT), sweet (CO2) environments where localized corrosion is a concern (high temperature, high chlorides, and low pH)
  • Tubing
  • Casing
  • Liners
  • Base Pipe for Sand Screens
  • Expandables
  • Perforating Guns
  • Landing Joints
  • Extensions
  • Shrouds
  • Maker Joints
  • Pipe for VIT
  • Swell Packers
  • Geothermal
  • Carbon Capture & Sequestration (CCS)

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Chemical Composition

CCrNiFeMnSiMoCuPSWN
≤ 0.0324 - 265.5 - 7.5BAL≤ 1≤ 0.752.5 - 3.50.2 - 0.8≤ 0.03≤ 0.030.1 - 0.50.1 - 0.3
(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 25-7-3

GradeYield
Strength
ksi
Tensile
Strength
ksi
Elongation
%
Hardness
HRC
NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
656590902526Table A.24
(annealed)
H2S ≤ 3.0 psi,
Temp ≤ 450°F
7575100902526
1101101401251136Table A.25
(cold-worked)
H2S ≤ 3.0 psi
1251251501301036
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/°F77.58
Elastic Moduluspsi x 1062928.227
Poisson Ratio0.240.240.24
Thermal ConductivityBtu/ft h °F8910
Specific HeatBtu/lb °F0.120.120.12

Product Availability

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
MAX WALL THICKNESS: 1.925”
LENGTHS: R1, R2, R3

END FINISH: Plain end, Premium threads, & API threads

Standard & Non-Standard Sizes Available.

Manufactured Material Available as Quickly as 1 Week.

Non-Standard Mill Quantities Accommodated