GX2CrNiMoN22-5-3
The cast counterpart of 2205 duplex. Used for high-strength, chloride-resistant valve and pump bodies in seawater, petrochemical and wastewater treatment applications.
- Rp0.2 · MPa
- ≥ 420
- Rm · MPa
- 600–800
- TEMPERATURE
- ≤ +300 °C
- COST
Chemical composition
%, single values are maximums.
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| EN 10213 · +AT, t ≤ 150 mm | 420 | — | 600–800 | 20 | — |
Room temperature, +AT (1120–1150 °C), t ≤ 150 mm.
Service temperature
The duplex structure is not used for long periods above ~300 °C (475 °C embrittlement).
This is the limit of the material itself. A valve's service temperature is usually set by the seal and seat materials; product pages give it for each seal option.
Physical properties and heat treatment
- HEAT TREATMENT
- Solution annealing 1120–1150 °C, rapid cooling.
Media suitability GENERAL TREND
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- Twice the proof strength of CF8M
- Resistant to chloride stress corrosion cracking
- High erosion resistance
Weaknesses
- Not used above ~300 °C
- The ferrite/austenite balance needs control in casting and heat treatment
- Weld repair requires a qualified procedure
Manufacturing and use
- ECONOMY
- Medium to high.
- MANUFACTURING METHODS
- Sand casting + solution annealing
- TYPICAL VALVE PARTS
- Body · Bonnet · Disc
Source: EN 10213. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.