March 10, 2019

Duplex Stainless Steel GX2CrNiMoN22-5-3(EN 1.4470)

GX2CrNiMoN22-5-3 stainless steel is duplex stainless steel for casting purpose; it’s a ferritic-austenitic corrosion resistant casting steel.

GX2CrNiMoN22-5-3 is defined in standard EN 10283 and EN 10213 and ISO 11972, the EN number is 1.4470

EN 10213: 2007 Steel castings for pressure purposes

EN 10283: 2010 Corrosion resistant steel castings

ISO 11972:2015 specifies cast steels for general corrosion-resistant applications.

X2CrNiMoN22-5-3 (EN 1.4462) is similar grade in standard of in EN 10088-3

EN 10088-3 : Stainless steels

GX2CrNiMoN22-5-3 (EN 1.4470) Equivalent Stainless Steel grade:

ASTM A890/A995 Grade 4A; Type 22Cr-5Ni-Mo-N; Casting UNS J92205; ACI CD3MN; Wrought UNS S31803; Wrought grade SS2205; EN 1.4462 X2CrNiMoN22-5-3; SUS 329J3L

Pump Body-investment Casting


GX2CrNiMoN22-5-3 (EN 1.4470) Heat treatment process: Solution annealing + water quenching (+AT)

Heat to 1120-1150°C for sufficient time to heat casting uniformly to temperature and water quench, or the casting may be furnace cooled to 1010-1050°C prior to water quenching in order to improve corrosion resistance and prevent cracks in complex shapes.

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GX2CrNiMoN22-5-3Chemical requirements and Mechanical Property

StandardEN10213EN10283ISO 11972EN 10088-3
EN number1.44701.44701.44701.4462
C max0.
Si max1.
Mn max2.
P max0.0350.0350.0350.035
S max0.0250.0250.0250.015
Tensile Mpa,min420420420450
0.2% proof Mpa, min600-800600650650-880
Elongation, %,min20 (+AT)20 (+AT)22 (+AT)25
Impact Kv,J, min303050100
Thickness, mm150150150160
Hardness, HB, max270

GX2CrNiMoN22-5-3 (EN 1.4470))BENEFITS

Corrosion and pitting resistance

Better for abrasive applications

Higher strength than standard stainless steel

Improved ductility and weldability

Better resistance to embrittlement

Mechanical properties

ReH Minimum yield strength / Mindestwert der oberen Streckgrenze / Limite d elasticite minimale

Rm  Tensile strength / Zugfestigkeit / Resistance a la traction
A     Minimum elongation / Mindestwert der Bruchdehnung / Allongement minimal
J      Notch impact test / Kerbschlagbiegeversuch / Essai de flexion par choc

Heat treatment conditions
+A     Soft annealed
+AC Annealed to achieve spheroidization of the carbides
+AR As rolled
+AT   Solution annealed
+C    Cold drawn / hard
+CR Cold rolled
+FP   Treated to ferrite-pearlite structure and hardness range
+I      Isothermal annealing
+LC Cold drawn / soft
+M    Thermo mechanical rolling
+N    Normalized
+NT Normalized and tempered
+P     Precipitation hardened
+PE   Peeled
+QA Air quenched and tempered
+QL Liquid quenched and tempered
+QT Quenched and tempered
+S     Treated to improve shearability
+SH As rolled and turned
+SR Cold drawn and stress relieved
+T     Tempered
+TH Treated to hardness range
+WW          Warm worked
+U    Untreated


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