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| Property | Value |
|---|---|
| UNS Number | S31000 / S31008 |
| ASTM Standard | ASTM A193/A194, A320 |
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Density | 7.98 g/cm³ |
| Max Service Temp | 1150°C |
| Element | Composition (%) |
|---|---|
| Cr | 24.0–26.0 |
| Ni | 19.0–22.0 |
| Fe | bal |
| Mn | ≤2.0 |
| C | ≤0.25 |
| Si | ≤1.50 |
| P | ≤0.045 |
SS 310 / 310S fasteners are austenitic stainless steel alloys engineered around high chromium (24-26%) and nickel (19-22%) content, which forms a stable, adherent oxide layer resisting oxidation at extreme temperatures. Controlled carbon levels, particularly in the 310S variant, minimize carbide precipitation and improve weldability. Silicon additions further enhance oxidation resistance, while manganese aids in deoxidation during manufacturing. This carefully balanced composition ensures excellent structural stability, sustained mechanical strength, and resistance to scaling even under prolonged thermal cycling, making the alloy suitable for demanding high-temperature fastening applications across multiple industries.
These fasteners deliver outstanding corrosion resistance in oxidizing, carburizing, and sulfurous environments, combined with reliable strength retention up to 1150°C. Their austenitic structure provides excellent toughness, ductility, and resistance to thermal fatigue, ensuring long service life in furnaces, heat exchangers, kilns, and exhaust systems. The non-magnetic properties and superior creep resistance further enhance performance in critical high-temperature assemblies. Combined with good weldability and dimensional stability, SS 310/310S fasteners offer dependable mechanical integrity, making them the preferred choice for engineers seeking durable, corrosion-resistant fastening solutions in extreme service conditions.
Specifications
SS 310 / 310S Fasteners are defined by their mechanical properties, dimensional specifications, and technical data, delivering dependable performance in demanding service conditions. Their balance of strength, corrosion resistance, and fit supports precise selection for industrial applications, with dimensions aligned to standard fastening requirements.
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa min |
| Yield Strength (0.2% Offset) | 205 MPa min |
| Elongation | 40% min |
| Hardness | 95 HRB max |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion (20-100°C) | 14.4 x10⁻⁶/°C |
| Thermal Conductivity | 14.2 W/m·K |
| Density | 7.98 g/cm³ |
| Melting Range | 1400-1450°C |
| Max Service Temperature | 1150°C |
| Specification | Details |
|---|---|
| Bolt Standard | ASME B18.2.1 |
| Stud Bolt Standard | ASTM A193 Gr B8/B8S |
| Nut Standard | ASME B18.2.2 / ASTM A194 |
| Washer Standard | ASME B18.22.1 |
| Thread Form | UNC, UNF, Metric Coarse |
| Diameter Range | M6 - M100 / 1/4" - 4" |
| Length Range | 10mm - 500mm |
| Available Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Inspection Standards | EN 10204 3.1 / 3.2 |
Applications
