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22 Chrome / 2205: Duplex Stainless Steel

Common Names:

22CR, 2205, Sanmac 22Cr, Duplex 2205, Duplex F60, Duplex F51, 318S13, 1.4462, VM22

Alloy Group

Duplex Stainless Steel

Corrosion Resistance

Moderate

Yield Strength

65

—

160

Wall Tolerance

0.875

Density

0.28

PREN

32.18

—

39.4

Additional Documentation

Alloy Details

22 Chrome (UNS S31803), commonly known as 2205 Duplex or 22Cr, is a cold-hardened duplex stainless steel designed to provide corrosion resistance in sweet (CO2) and mildly sour (H2S) environments with moderate chloride concentrations, offering high strength up to 400°F.

Compared to Super 13 Chrome, 22Cr delivers superior mechanical properties and enhanced resistance to the effects of CO2, chlorides, pH changes, and elevated temperatures. Its increased strength and temperature tolerance make it suitable for use in deeper wells under high-pressure, high-temperature (HPHT) conditions, where it is used in downhole tubular components, packers, and other subsurface equipment. It is important to consider all relevant environmental factors, such as H2S, CO2, temperature, pH, and chloride concentration, before selecting this material.

This alloy is classified under MR0175/ISO15156 as a duplex stainless steel with a Pitting Resistance Equivalent Number (PREN) ≤40, suitable for environments with H2S partial pressure up to 0.3 psi.

Duplex Stainless Steel

Duplex Stainless Steels are two-phase alloys, combining roughly equal amounts of austenite and ferrite. These steels typically contain 20% to 30% chromium, along with molybdenum, nitrogen, and other elements that enhance resistance to pitting and crevice corrosion. As a result, they are ideal for applications in environments with high chloride content. In their annealed state, duplex steels offer yield strengths ranging from 65 to 100 KSI, while cold working can boost the yield strength up to 160 ksi.

Super Duplex Stainless Steels offer improved resistance to elevated temperatures and chloride levels, making them well-suited for demanding conditions such as seawater or water injection wells. Defined by a Pitting Resistance Equivalent Number (PREN) greater than 40, these alloys provide exceptional protection against high chlorides and dissolved oxygen.

Chemical Composition

C
6
Carbon
0.03%
N
7
Nitrogen
0.08%‒0.2%
Si
14
Silicon
1%
P
15
Phosphorus
0.03%
S
16
Sulfur
0.02%
Cr
24
Chromium
21%‒23%
Mn
25
Manganese
2%
Fe
26
Iron
63.72%‒71.92%
Ni
28
Nickel
4.5%‒6.5%
Mo
42
Molybdenum
2.5%‒3.5%

Specified Mechanical Properties

API 5CRA / ISO 13680 Group 2 Category 22-5-3
GradeYield
Strength
ksi		Tensile
Strength
ksi		Elongation
%		Hardness
HRC		NACE MR0175/ISO 15156
H2S Sour Service Limits
minmaxminminmax
656590902526Table A.24
(annealed)		H2S ≤ 1.5 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.

Per ASTM A789 / A790
Tensile StrengthYield StrengthElongationHardness
minimum, ksiminimum, ksiminimum, %HRC
90652532

* Higher strength properties can be provided in the cold hardened condition.

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