Alloy SGS-75
Descriptions
The SGS-75 alloy based on nickel and chromium is particularly effective in terms of its resistance to seizure in contact with stainless steels. Its stainless and self-lubricating properties allow it to be used for the production of moving parts in contact with stainless steels, without lubrication, with reduced operating clearance.
Designations
SEVA Designation : SGS-75
Standard designation :
ASTM A494M grade CY5SnBiM
Chemical Analysis
Ni : Bal
C : 0.05 max
Cr : 11-14
Mo : 2-3.5
Si : 0.05 max
Mn : 1. max
Fe : 2 max
Bi : 3-5
Sn : 3-5
Mechanical properties
Hardness: 145 HB
Tensile test at room temperature:
| Rp0,2 (MPa) | Rm (MPa) | A (%) |
| 220 | 300 | 5 |
Flexural modulus (Young): 185 GPa
Applications
Areas of use
• Chemistry
• Pharmacy
• Food industry
• Nuclear
Maximum temperature of use
140°C
Types of parts produced
Chemical, pharmaceutical and food industries: applications involving dry friction with stainless steels such as 316 L:
• Rotating or static parts of pumps: rotors, pistons etc.
• Filling systems: rotary valves, dosing sprues etc.
Nuclear industry: bearings and other components for handling systems in hostile environments. Wide range of standard parts available on request: round bars (cylinders) and bushings (hollow bars).
Standard structure
The microstructure of the SGS-75 alloy consists of an austenitic matrix rich in nickel, chromium and molybdenum.
The secondary phase rich in tin and bismuth gives the alloy tribological properties.
Physical properties
Density at 20°C: 8,5
Approximate melting range: 140°C - 1470°C
Chemical properties
| Compatibility | Remarks | |
| Oxidization resistance | ●●●●● | Results available to ascertain compatibility at contact with food products depending on environment, temperature and time of exposure. |
| Inertia | ●●●●○ |
Other properties
Magnetism: Non-magnetic
Production
SEVA produces the SGS-75 alloy in an electric induction furnace.
Cast in a sand mold.
Heat treatment: none.
Compatible processes
| Compatibility | Remarks | |
| Machining | ●●●●○ | Vitesse de coupe préconisée : 30 à 50 m/min |
| Welding | ○○○○○ | |
| Surface treatment |
○○○○○ |
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