Alloy SGS-37-18
Descriptions
The SGS-37-18 refractory alloy shows an excellent oxidation resistance at high temperatures.
Designations
SEVA designation : SGS-37-18
Standard designation:
AFNOR Z12NCS37.18
EN GX40NiCrSiNb38-19
DIN 1.4849
Chemical analysis
C : 0.3-0.5
Ni : 36-39
Cr : 18-21
Nb : 1.2-1.8
Si : 0.75-2.5
Mn : ≤ 2
Fe : Bal
Mechanical properties
Hardness: 150-190 HB
Tensile tests at room temperature:
| Rp0,2 (MPa) | Rm (MPa) | A (%) |
| 230 | 430 | 6 |
Young's modulus at 20°C : E = 200 GPa
Hot tensile tests:
| Temperature (°C) | 870°C |
| Rp0,2 (en Mpa) | 90-100 |
| Rm (en Mpa) | 145-160 |
| A(%) | 30-40 |
Creep resistance
| Temperature | 925°C |
| Creep strength in MPa causing rupture for a duration of 1000h: | 24 Mpa |
| Stress causing an elongation of 1% after 1000 h: | 19 Mpa |
Applications
Areas of use:
• Aircraft industry
• Industries
Maximum temperature of use:
900°C-1000°C
Types of parts produced:
• Tools for shaping titanium sheets by Super-Plastic
Forming (SPF) process
• Tools or industrial parts working at high temperatures
Standard structure
Austenitic matrix reinforced by precipitation of carbides.
Physical properties
Density at 20°C: 8.0 g/cm³
Approximate melting range: 1340-1390°C
Expansion coefficient α in 10-6 /°C :
| Temperature (°C) | α (10-6/°C) |
| 300 | 15.23 |
| 400 | 15.68 |
| 500 | 16.1 |
| 600 | 16.53 |
| 700 | 16.94 |
| 800 | 17.38 |
| 850 | 17.58 |
| 900 | 17.86 |
| 950 | 18.07 |
Other properties
Magnetism : non-magnetic
Thermal conductivity λ W.m-1.K-1 at:
| Temperature (°C) | λ W.m-1.K-1 |
| 20 | 12 |
Heat capacity at 20°C : 500 J.kg-1.K-1
Production
SEVA produces the SGS-37-18 alloy in an electric induction furnace under an argon gas protective atmosphere.
Cast in a sand mold.
Compatible processes
| Compatibility | Remarks | |
| Machining | ●●●●○ | Cutting speed recommended: 60 to 90 m/min |
| Polishing | ●●●●○ | |
| Hot isostatic pressing (HIP) | ●●●●○ | |
| Forging | ●●●●○ | |
| Welding | ●●○○○ |
Contact us
Are you looking for high-quality metal alloy foundry blanks for your industrial projects? Contact us now for a free, no-obligation quote.
