Alloy SGS-X23-24
Descriptions
SGS-X23-24 stainless alloy is a "duplex" alloy that belongs to the family of austenitic stainless steels. It has a corrosion resistance at least equivalent to common austenitic steels, as well as significantly better mechanical properties and abrasion resistance.
Designations
SEVA designation: SGS-X23-24
Standard designation:
AFNOR X3CrNiMoN27-5-2
DIN 1.4460
AISI 329
Chemical analysis (in%)
Standardized: (NF EN 10088)
Fe : Bal
C : 0.1 max
Cr : 23-27
Ni : 4.5-7
Si : 1 max
Mn : 2 max
Mo : 1.3-1.8
N : <0.2
Mechanical properties
Hardness: 230 HB.
Tensile test at room temperature:
| Rp0,2 (MPa) | Rm (MPa) | A (%) |
| 450 | 650 | 18 |
Applications
Areas of use
• Paper Industry
• Petrochemical industry
• Dyeing industry
• Transformation industries implying relatively strong chemical, mechanical and abrasive stress
Maximum temperature of use
300°C.
Types of parts produced
• Bodies
• Wheels
• Pump shafts
• Valves
• Miscellaneous parts
Standard structure
Approximately 50 % austenite and 50 % ferrite.
Physical Properties
Density: 7,5
Approximate melting range: 1350 - 1450°C
Chemical properties
The main characteristic of the SGS-X23-24 alloy is a better pitting resistance than common austenitic steels (304, 316L).
It is also extremely resistant to stress corrosion, particularly in the presence of anions Cl- or de H2S.
Thanks to its hardness, this steel can be used for applications that require good resistance to corrosion and to abrasion.
Other properties
Magnetism: Magnetic
Thermal conductivity: 25 W.m-1.K-1
Production
SEVA produces the SGS-X23-24 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 | Remarks | |
| Machining | ●●●●○ | Cutting speed: ~ 70 - 80 m/min (with carbide tools M type) |
| Polishing | ●●●●○ | |
| Welding | ●●●○○ | |
| Hot isostatic pressing (HIP) |
●●●●○ | |
| Forging | ●●●●● |
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