Alloy SGS-R18-09
Descriptions
Refractory alloy SGS-R18-09 is an economical alternative to SGS-R25-20 when the temperature demands are lower.
Designations
SEVA Designation : SGS-R18-09
Standard designations:
AFNOR Z 25 CNS 18-09 – 02- M (NF A 32-057)
EN GX25CrNiSi18-9 (NF EN 10295)
DIN 1.4825
Chemical Analysis
e : Bal.
C : 0.15 - 0.35
Cr : 17 - 19
Ni : 8 - 10
Si : 0. - 2.5
Mn : 2 max
Mechanical properties
Hardness: 170 HB
Tensile test at room temperature:
(Values without thermal treatment)
| Rp0,2 (MPa) | Rm (MPa) | A (%) |
| 230 | 450 | 15 |
Creep resistance
Breaking stress N/mm² (MPa) at:
| 600°C | 700°C | 800°C | 900°C | |
| Time 100 h | - | 120 | 60 | 40 |
| Time 1 000 h | 220 | 90 | 50 | 30 |
| Time 10 000 h | 77 | 42 | 20 | 9 |
Applications
Areas of use
• Glass industry
• Cement works
• Metallurgy
• Petrochemical industry
• Glass toolings
Maximum temperature of use
900°C
Types of parts produced
• Glass process toolings
• Furnace parts
Standard structure
Austenitic with carbide precipitation.
Physical Properties
Density at 20°C: 7,8
Approximate melting range: 1370-1430°C
Thermal expansion coefficient: α en 10-6 K-1 between 20°C and:
| 400°C | 800°C | 1000°C |
| 17,4 | 18,5 | 18,8 |
Other properties
Magnetism: Non-magnetic
Thermal conductivity λ en W.m-1.K-1 à :
| 20°C | 100°C | 800°C | 1000°C |
| 14,8 | 15,5 | 26,0 | 30,0 |
Thermal mass capacity at 20°C : Cp = 500 J.Kg-1.K-1
Production
SEVA produces the SGS-R18-09 alloy in an induction furnace under an Argon gas protective atmosphere.
Cast in a sand mold.
Heat treatment: homogenization.
Compatible processes
| Compatibility | Remarks | |
| Machining | ●●●●● | Cutting speed: 80 - 110 m/min |
| Polishing | ●●●●● | |
| Welding | ●●●●● | Electrode or TIG |
| Hot isostatic pressing (HIP) |
●●●●○ | |
| Forging | ●●●●○ |
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