22CR / 2205

22 CR / 2205 Duplex Alloy

UNS S31803 / W.Nr 1.4462

COMMON TRADE NAMES: 22 Chrome Duplex, SM22CR®, 2205, Duplex 2205, SAF® 2205, Sanmac® 2205, VM® 22, F51

22 Chrome, or 2205 Duplex, is a cold hardened duplex stainless steel with a nitrogen addition for improved corrosion resistance, particularly where welding is required. In the annealed condition, alloy 2205 has more than twice the strength of conventional austenitic stainless steels and, in many environments, exhibits corrosion resistance superior to alloy 316. It is the most widely used of the duplex stainless steels offering improved mechanical properties and increased resistance to the effects of CO2, chlorides, pH, and temperatures when compared with Super 13 Chrome.


Corrosion graphic

Corrosion Resistance

Alloy 2205 has excellent resistance to chloride-induced pitting corrosion and stress corrosion cracking. It has a minimum Pitting Resistance Number (PREN) of 35. It is suitable for service in environments high in chlorides, such as oil and gas production and in heat exchangers using chloride-bearing water as a coolant. It is also suitable for mild hydrogen sulfide, dilute reducing and organic acids, and moderate to high levels of oxidizing acids.
Service Temperature

Elevated Temperature Resistance

The ASME Boiler and Pressure Vessel Code places an upper-temperature limit of 600°F (315°C). Exposure to temperatures above this for extended periods results in embrittlement.
Mechanical Properties

Mechanical Properties

Alloy 2205 has more than twice the strength of conventional austenitic stainless steels in the annealed condition. It can also be provided in the cold-worked condition with yield strength exceeding 160 ksi. It maintains good toughness at temperatures down to -50°F (-10°C).


Duplex 25 Chrome is suitable for environments high in chlorides and commonly used in oil and gas production, marine applications, and chemical processing. In upstream oil and gas, 22 Chrome is used extensively as tubing, casing, or liners in corrosive wells containing the presence of CO2, low H2S, and chlorides. It is often commonly used in heat exchangers using chloride-bearing water as a coolant.

CRA offers specialty alloy 22 Chrome seamless pipe & tube for use in multiple industries and applications, including:

  • Corrosive oil & gas wells containing the presence of CO2 , low H2S, and chlorides
  • High-pressure, high-temperature (HPHT), environments where localized corrosion is a concern

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Chemical Composition

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

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.

Per ASTM A789 / A790
Tensile StrengthYield StrengthElongationHardness
minimum, ksiminimum, ksiminimum, %HRC
*Higher strength properties can be provided in the cold hardened condition.

Typical Physical Properties

Thermal ExpansionX10-6/°F-
Elastic Modulus103 ksi29.
Poisson Ratio-0.3---
Thermal ConductivityBtu-in/h·ft2·°F96108120132
Specific HeatBtu/lb·°F0.
Yield Strengthksi6530.22623
Tensile Strengthksi9075.26664

Manufacturing Process

Steel MakingElectric Arc Furnace followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD).
Pipe MakingConventional Seamless Cold Finished Pipe and Tube Manufacturing Processes.
Heat TreatmentCannot be hardened by heat treatment. May be provided in the annealed or cold hardened condition.

Product Availability

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
LENGTHS: Up to 70′ (840”)

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