22 Chrome

Also Known As

• 22 Chrome Duplex
• 22Cr
• SM22CR®
• 2205
• Duplex 2205
• SAF 2205®
• Sanmac® 2205
• VM® 22
• F51

Suitable Applications

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)

Product Availability

Seamless Pipe, Tubing

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

R1, R2, R3

22 Chrome

UNS S31803 | Datasheet

22CR Applicable Environments22 Chrome (UNS S31803), also referred to as 2205 Duplex or Duplex 22 Chrome, is a cold hardened duplex stainless steel intended for corrosion resistance in sweet (CO2) and mildly sour (H2S) environments with moderate chloride content, requiring high strength up to 400°F.

22 Chrome offers improved mechanical properties and increased resistance to the effects of CO2 , chlorides, pH, and temperatures when compared with Super 13 Chrome. The higher strength and temperature resistance, relative to Super 13 Chrome, allow it to be used in deeper wells with high-pressure and high-temperature (HPHT) conditions, as downhole tubular components, packers, and other subsurface equipment. All environmental factors, including H2S, CO2 , temperature, pH, and chloride concentration, should be considered before final material selection.

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

Chemical Composition

≤ 0.0321 - 234.5 - 6.5BAL≤ 2≤ 12.5 - 3.5≤ 0.03≤ 0.020.08 - 0.2
(mass %)

Manufacturing Process

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 22-5-3 
NACE MR0175/ISO 15156
H2S Sour Service Limits
656590902526Table A.24
H2S ≤ 3.0 psi,
Temp ≤ 450°F
1101101401251136Table A.25
H2S ≤ 3.0 psi
140140160145938140 Grade not recommended for sour service
*Non-standard mechanical properties and grades are made available upon agreement.

Typical Physical Properties

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

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