Stainless steel · cast
1.4317
GX4CrNi13-4
Soft martensitic stainless casting (13% Cr, 4% Ni). High strength, wear and cavitation resistance; used in water turbines, pumps and high-pressure valve trim.
- Rp0.2 · MPa
- ≥ 550
- Rm · MPa
- 760–960
- TEMPERATURE
- −29 … +482 °C
- COST
Chemical composition
C≤ 0.06
Si≤ 1.00
Mn≤ 1.00
P≤ 0.035
S≤ 0.025
Cr12.0–13.5
Mo≤ 0.70
Ni3.5–5.0
Cu≤ 0.30
V≤ 0.08
%, single values are maximums.
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| EN 10213 · +QT, t ≤ 300 mm | 550 | — | 760–960 | 15 | — |
| ASTM A487 · CA6NM | 550 | — | 760–930 | 15 | — |
EN 10213 +QT (quenching 1000–1050 °C, tempering 590–620 °C), t ≤ 300 mm; ASTM A487 CA6NM.
Service temperature
−29 °C+482 °C−200−1000100200300400500600700800
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
- Quenching 1000–1050 °C + tempering 590–620 °C.
Media suitability GENERAL TREND
Fresh water
Seawater
Steam
Hydrocarbons, oil
Dilute acid
Caustic
Air, gas
Low temperature
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- High strength and toughness
- Highly resistant to cavitation and erosion
- Repairable by welding (good for a martensitic grade)
Weaknesses
- Lower corrosion resistance than austenitic grades
- Heat treatment needs precise control
- Requires a hardness limit (NACE) in H₂S service
Manufacturing and use
- ECONOMY
- Medium.
- MANUFACTURING METHODS
- Sand casting + quenching and tempering
- TYPICAL VALVE PARTS
- Disc, ball · Seat · High-pressure body
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.