Alloy SGS-R26-52
Descriptions
The nickel-based refractory alloy SGS-R26-52 combines excellent creep resistance with good hot chemical properties. Its characteristics make it a preferred candidate for the most difficult applications.
Designations
SEVA designation: SGS-R26-52
Standard designation: (heat-resistant cast steels)
AFNOR Z 45 NCW 45.25-M (NF A 32-057)
EN G-NiCr28W (NF EN 10295)
DIN 2.4879
Chemical Analysis (in%)
Fe : Bal
C : 0.35-0.50
Si : 0.50-2.00
Mn : ≤1.50
P : ≤0.035
S : ≤0.030
Cr : 27.0-30.0
Ni : 47.0-50.0
W :4.00-5.50
Mechanical properties
Hardness: 207 HB
Tensile test at room temperature:
| Rp0,2 (MPa) | Rm (MPa) | A (%) |
| 240 | 440 | 3 |
Tensile test between 600°C and 920°C:
| Rp0,2 (MPA | Rp1,0 (MPa) |
Rm (MPa) |
E (GPa) |
A (%) | Z (%) | |
| 600°C | 235 | 325 | 442 | 145 | 5 | 8 |
| 760°C | 190 | 233 | 347 | 143 | 16 | 22 |
| 920°C | 104 | 123 | 186 | 117 | 25 | 45 |
Creep resistance
Values for a stress applied during 10,000 hours
at high temperature:
| 700°C | 800°C | 900°C | 1000°C | |
| Strain of 1% (MPa) | - | 45 | 25 | 11 |
| Breaking time (MPa) | 84 | 50 | 29 | 14 |
Creep resistance between 600°C and 920°C:
| 700°C | 760°C | 920°C | |||||||
| Stress (MPa) | 300 | 325 | 350 | 120 | 141 | 162 | 50 | 55 | 60 |
| Breaking time (h) | >84 | 63 | 11 | <67 | 22 | 9 | <112 | 50 | 30 |
Applications
Areas of use
• Industry
• Cement works
• Petrochemical industry
• Glass industry
Maximum temperature of use
1150°C
Types of parts produced
• Miscellaneous toolings
• Thermocouple envelopes
Standard structure
Austenitic, nickel-based matrix with a network of tungsten and chromium carbides.
Physical Properties
Density at 20°C: 8,2
Approximate melting range: 1260-1360°C
Linear expansion coefficient : α in 10-6/°C-1 between 20°C and
| 200°C | 400°C | 600°C | 800°C | 1000°C | 1050°C |
| 14,2 | 15,1 | 16,3 | 17,4 | 18,5 | 18,9 |
Other properties
Magnetism: Non-magnetic
Thermal conductivity in W.m-1.°C-1
| 20°C | 100°C | 800°C | 1000°C |
| 11 | 11,3 | 30,6 | 36,1 |
Mass thermal capacity at 20°C : Cp = 500 J.Kg-1.°C-1
Mass thermal capacity between 40°C and 975°C: Cp en J.Kg-1.°C-1
| 40°C | 100°C | 200°C | 300°C | 400°C | 500°C | 600°C | 700°C | 800°C | 900°C | 975°C |
| 409 | 457 | 477 | 486 | 501 | 522 | 575 | 584 | 590 | 601 | 609 |
Production
SEVA produces the SGS-R26-52 alloy in an electric induction furnace, under an Argon gas protective atmosphere.
Cast in a sand mold.
Heat treatment: Mechanical reinforcement by carbide
precipitation.
Compatible processes
| Compatibility | |
| Polishing | ●●●●● |
| Welding | ●●●●● |
| Hot isostatic pressing (HIP) |
●●●●○ |
| Forging | ●●●●○ |
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