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| Property | Value |
|---|---|
| UNS Number | S32100 |
| ASTM/ASME Standard | ASTM A193 Gr B8T / A320 B8T |
| Tensile Strength | 515 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Density | 8.0 g/cm³ |
| Max Service Temperature | 800°C |
| Element | Composition (%) |
|---|---|
| Cr | 17.0–19.0 |
| Ni | 9.0–12.0 |
| Ti | ≥5×C |
| Mn | ≤2.0 |
| C | ≤0.08 |
| Si | ≤0.75 |
| Fe | bal |
SS 321 fasteners derive their performance from a carefully balanced composition of chromium, nickel and titanium. Chromium, present at 17-19%, forms a passive oxide layer that provides robust corrosion resistance, while nickel at 9-12% stabilizes the austenitic structure and enhances ductility and toughness. The distinguishing element is titanium, added at a minimum of five times the carbon content, which stabilizes carbon and prevents chromium carbide precipitation during welding or elevated temperature exposure, thereby preserving intergranular corrosion resistance.
This titanium stabilization makes SS 321 fasteners particularly suited for high-temperature service, offering excellent resistance to sensitization, oxidation and creep up to 800°C. The alloy maintains strong mechanical performance, good weldability and reliable corrosion resistance in industrial, chemical and marine environments. These characteristics make SS 321 fasteners the preferred choice for exhaust systems, aerospace components, heat exchangers and other applications demanding long-term strength and stability under thermal cycling and corrosive conditions.
Specifications
SS 321 Fasteners offer a balanced combination of mechanical strength, corrosion resistance, and heat performance, with dimensional specifications suited to precision assembly requirements. Their technical data is defined by tensile behavior, hardness, and size tolerances, making them suitable where reliable fastening and stable service properties are essential.
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa min |
| Yield Strength (0.2% offset) | 205 MPa min |
| Elongation | 40% min |
| Hardness | 217 HB max / 95 HRB max |
| Modulus of Elasticity | 193 GPa |
| Thermal Expansion (20-100°C) | 16.6 µm/m·°C |
| Thermal Conductivity | 16.1 W/m·K |
| Density | 8.0 g/cm³ |
| Melting Range | 1400-1425°C |
| Maximum Service Temperature | 800°C |
| Standard | Details |
|---|---|
| Bolt Standard | ASTM A193 Gr B8T, ISO 4014/4017 |
| Stud Bolt Standard | ASTM A193 Gr B8T, ASME B16.5 |
| Nut Standard | ASTM A194 Gr 8T, ISO 4032 |
| Washer Standard | ASME B18.22.1, DIN 125/127 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6 to M100 / 1/4" to 4" |
| Length Range | 10mm to 500mm (custom lengths available) |
| Available Product Forms | Bolts, Studs, Nuts, Washers, Screws |
| Manufacturing Standards | ASTM, ASME, DIN, ISO, EN |
| Inspection Standards | NACE MR0175, PMI, RT, third-party inspection |
Applications
