22 Chrome (UNS S31803), also referred to as 2205 Duplex or 22Cr, 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.
22Cr 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.
21 - 23
4.5 - 6.5
2.5 - 3.5
0.08 - 0.2
Made by electric furnace process or blast furnace followed by Vacuum Oxygen Decarburization (VOD) process or Argon Oxygen Decarburization (AOD) Process
Manufactured by traditional tube manufacturing processes, High strength tubulars should be furnished in cold worked condition
Solution Annealing Process before final cold drawing
Specified Mechanical Properties
API 5CRA / ISO 13680 Group 2 Category 22-5-3
Yield Strength ksi
Tensile Strength ksi
NACE MR0175/ISO 15156 H2S Sour Service Limits
Table A.24 (annealed)
H2S ≤ 3.0 psi, Temp ≤ 450°F
Table A.25 (cold-worked)
H2S ≤ 3.0 psi
140 Grade not recommended for sour service
*Non-standard mechanical properties and grades are made available upon agreement.