Alloy SGS-R35-25
Descriptions
Refractory alloy SGS-R35-25 is used in the Hot Forming process for the aerospace industry.
Designations
SEVA designation: SGS-R35-25
Standard designation:
EN X40NiCrNb35-25 (NF EN 10295)
DIN 1.4852
Chemical analysis (in%)
C : 0.3-0.5
Ni : 33-36
Cr : 24-27
Si : 1-2.5
Nb : 0.8-1.8
Mn : < 2
Mo : < 0.5
Fe : Bal.
Mechanical properties
Hardness: 400 HB
Tensile tests at room temperature:
| Rp0,2 (MPa) | Rm (MPa) | A (%) |
| 240 | 440 | 4 |
Young's modulus at 20°C : E = 200 GPa
Hot tensile tests:
| Temperature | 750°C | 800°C | 850°C | 900°C | 950°C |
| Rp0,2 (MPA) | 152 | 137 | 103 | 80 | 71 |
| Rp1,0 (MPa) | 279 | 211 | 152 | 117 | 80 |
| Rm (MPa) | 279 | 211 | 152 | 117 | 80 |
| A (%) | 15-25 | 15-25 | 20-40 | 25-40 | 25-40 |
Applications
Areas of use:
Aircraft industry
Maximum temperature of use:
800°C - 900°C
Types of parts produced:
• Tools for shaping titanium sheets by Hot Forming (HF) process
• Tools or industrial parts working at high temperature
Standard structure
Austenitic matrix reinforced by precipitation of carbides.
Physical properties
Density at 20°C : 8.0 g/cm³
Expansion coefficient α in 10-6 /°C :
| Temperature (°C) | α (10-6/°C) |
| 400 | 16 |
| 800 | 17 |
| 1000 | 18 |
Other properties
Magnetism: non-magnetic
Thermal conductivity λ in W.m-1.K-1 at:
| Temperature (°C) | λ W.m-1.K-1 |
| 20 | 12,8 |
| 100 | 13 |
| 800 | 17 |
| 1000 | 27,7 |
Capacité thermique à 20°C : 500 J.kg-1.K-1
Production
SEVA produces the SGS-35-25 alloy in an electric induction furnace under an argon gas protective atmosphere.
Cast in a sand mold.
Heat treatment: mechanical reinforcement.
Compatible processes
| Compatibility | Remarks | |
| Machining | ●●●●○ | Vitesse de coupe préconisée : 30 à 50 m/min |
| Polishing | ●●●●○ | |
| Hot isostatic pressing (HIP) |
●●●●○ | |
| Forging | ●●●●○ | |
| Welding | ●●○○○ |
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