Alloy SGS-625
Descriptions
The SGS-625 has excellent high temperature properties (creep, oxidation and corrosion resistance), good toughness at very low temperatures and high tensile strength.
Excellent pitting resistance in marine environment.
Designations
SEVA designation: SGS-625
Standard designation:
AFNOR NC 22 Dnb
EN NiCr22Mo9Nb
DIN 2,4856
USA (AISI) N06625 (ASTM B 446)
Chemical analysis
C : 0.1
Cr : 20-23
Mo : 8-10
Nb : 3.15-4.15
Fe : <5
Mn : <0.5
Si : <0.5
P : <0.015
S : < 0.015
Al : <0.4
Ni : Bal.
Mechanical properties
Hardness: 180-250 HB
Tensile tests at room temperature:
| Rp0,2 (MPa) | Rm (MPa) | A (%) |
| 300-400 | 550-700 | 20-40 |
Young's modulus at 20°C : E = 200 GPa
| Temperature | 200 | 300 | 400 | 500 |
| Rp0,2 (MPa) | 420 | 410 | 380 | 310 |
Applications
Areas of use:
• Aircraft industry
• Shipbuilding
• Petrochemicals
• Cryogenics
• Nuclear industry
• Industrial application at high temperature
Maximum temperature of use:
1000°C
Types of parts produced:
Various foundry parts
Standard structure
Austenitic nickel matrix reinforced with Nb and Cr.
Physical properties
Density at 20°C : 8.4g/cm³
Approximate melting range: 1290-1350°C
Expansion coefficient α in 10-6 /°C :
| Temperature (°C) | α (10-6/°C) |
| 93 | 12.8μm/m.°C |
Other properties
Magnetism: paramagnetic
Thermal conductivity at 20°C : 9.8 λ W.m-1.K-1
Specific heat capacity at 20°C : 0.41 Cp en J.g-1.°C-1
Thermal conductivity λ in W.K-1.m-1
at different temperatures:
| Temp. | - 157°C | 21°C | 38°C | 93°C | 204°C | 316°C |
| λ | 7.2 | 9.8 | 10.1 | 10.8 | 12.5 | 14.1 |
| Temp. | 427°C | 538°C | 649°C | 760°C | 871°C | 982°C |
| λ | 15.5 | 17.5 | 19 | 20.8 | 22.8 | 25.2 |
Production
SEVA produces the SGS-625 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: 30 to 50 m/min |
| Polishing | ●●●○○ | |
| Hot isostatic pressing (HIP) | ●●●●● | |
| Forging | ●●●●○ | |
| Welding | ●●○○○ | Electrode or TIG. |
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