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X2CrNiMoN22-5-3 (Duplex 2205)

Standard duplex stainless. Twice the yield strength of 316L, PRE approx 35. Excellent SCC resistance. Standard for offshore and desalination.

Stainless Steels Duplex Stainless Steel ENX2CrNiMoN22-5-3 DIN1.4462 UNSS32205 / S31803 ASTMA240 / A276 UNS S32205 +12
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Description

X2CrNiMoN22-5-3 (EN 1.4462 / UNS S32205). Dual austenitic-ferritic microstructure provides yield strength approx 450 MPa (nearly twice 316L), PRE approx 35, excellent immunity to chloride SCC. Standard for offshore, desalination, chemical and pulp/paper industries.

Key Properties — Solution Annealed (plate)
Rm (Tensile Strength)
620 – 880
MPa
Re / Rp0.2 (Yield)
450
MPa
A₅ (Elongation)
≥ 25.0
%
Hardness
— – 290
HB
E (Young's Modulus)
200
GPa
Density
7.80
g/cm³
Main Designations (16)
Standard BodyDesignationCountry / RegionNote
EN X2CrNiMoN22-5-3 European Union
DIN 1.4462 Germany
UNS S32205 / S31803 USA
ASTM A240 / A276 UNS S32205 USA
BS EN 2205 UK
JIS SUS329J3L Japan
GOST 03X22H5AM3 Russia / CIS
UNI X2CrNiMoN22-5-3 Italy
NF Z2CND22-5-03 France
SS 2377 Sweden
PN X2CrNiMoN22-5-3 Poland
CSN 1.4462 Czech Republic
GB 022Cr22Ni5Mo3N China
JUS C.4730 Yugoslavia / Serbia Duplex Cr-Ni-Mo-N stainless (nearest JUS equiv.)
ISO X2CrNiMoN22-5-3 International
ASME SA-240 UNS S32205 USA
Standards (16)
#Standard BodyDesignationCountry / RegionNote
1 EN X2CrNiMoN22-5-3 European Union —
2 DIN 1.4462 Germany —
3 UNS S32205 / S31803 USA —
4 ASTM A240 / A276 UNS S32205 USA —
5 BS EN 2205 UK —
6 JIS SUS329J3L Japan —
7 GOST 03X22H5AM3 Russia / CIS —
8 UNI X2CrNiMoN22-5-3 Italy —
9 NF Z2CND22-5-03 France —
10 SS 2377 Sweden —
11 PN X2CrNiMoN22-5-3 Poland —
12 CSN 1.4462 Czech Republic —
13 GB 022Cr22Ni5Mo3N China —
14 JUS C.4730 Yugoslavia / Serbia Duplex Cr-Ni-Mo-N stainless (nearest JUS equiv.)
15 ISO X2CrNiMoN22-5-3 International —
16 ASME SA-240 UNS S32205 USA —
All values in wt.%
C
Carbon
≤ 0.0300
Si
Silicon
≤ 1.0000
Mn
Manganese
≤ 2.0000
Cr
Chromium
21.0000 – 23.0000
Ni
Nickel
4.5000 – 6.5000
Mo
Molybdenum
2.5000 – 3.5000
N
Nitrogen
0.1400 – 0.2000
ElementSymbolMin %Max %Typical %
Carbon C — 0.0300 0.0180
Silicon Si — 1.0000 0.5000
Manganese Mn — 2.0000 1.0000
Chromium Cr 21.0000 23.0000 22.0000
Nickel Ni 4.5000 6.5000 5.5000
Molybdenum Mo 2.5000 3.5000 3.1000
Nitrogen N 0.1400 0.2000 0.1700
Mechanical Properties
ConditionCode Rm min
MPa		Rm max
MPa		 Re min
MPa		Re max
MPa		 A₅ min
%		 Z
%		 KV
J		 HB minHB max HRC minHRC max E
GPa
Solution Annealed (plate) +AT 620 880 450 — 25.0 — 62.0 — 290 — — 200.0
Physical Properties
Density
7.800
g/cm³
Melting Point
1380–1420
°C
Young's Modulus
200.0
GPa
Poisson's Ratio
0.300
—
Thermal Conductivity
19.0
W/m·K
Thermal Expansion
13.00
×10⁻⁶ /K
Specific Heat
480
J/kg·K
Electrical Resistivity
0.8500
µΩ·m
Magnetic
Yes
 
Heat Treatment
Solution Annealing
Temperature:1020°C – 1100°C
Medium:Water quench — rapid
Duration:Sufficient
Cooling:Rapid quench mandatory
Hardness After:HB 290 max
Slow cooling causes sigma-phase embrittlement.
AVOID 700-900 C exposure
Temperature:700°C – 900°C
Medium:N/A
Duration:N/A
Cooling:N/A
Hardness After:N/A
Sigma and chi phase form rapidly — never allow prolonged exposure.
Machinability
Machinability Rating
relative to AISI B1112 = 100%
38.0%
Very Difficult
Turning Speed (HSS)
15
m/min
Turning Speed (Carbide)
80
m/min
Feed Rate (Turning)
0.100
mm/rev
Drilling Speed (HSS)
9
m/min
Milling Speed (Carbide)
85
m/min
CoolantHigh-pressure flood coolant — mandatory
Chip FormationShort-medium chips; high cutting forces
Tool MaterialCarbide P10/M10; TiAlN coated
Surface FinishRa 0.4-1.6 um
Harder to machine than 316L. Reduce speed vs austenitic by ~20%.
Applications
Oil & Gas
Subsea pipelines, umbilicals, riser pipes, manifolds and topside process piping.
Desalination
Pressure vessels, heat exchangers and pipe headers in RO and MSF plants.
Chemical Process
Tanks and reactors for chloride-containing acids and urea synthesis.
Technical Notes
⚠️
Sigma Phase
Extended exposure above 300 C reduces ductility. Max continuous service: 280 C.
✅
SCC Advantage
Duplex 2205 is essentially immune to chloride SCC — primary failure mode of 316L in chloride environments above 50 C.
🔥
Weldability
Good but requires care. Use 2209 filler. Maintain interpass temperature <150 C.