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| Specification | Detail |
|---|---|
| UNS Number | S30400 |
| ASTM/ASME Standard | ASTM A193 / ASME SA193 |
| Tensile Strength | 515 MPa (75 ksi) min |
| Yield Strength | 205 MPa (30 ksi) min |
| Density | 8.0 g/cm³ |
| Max Service Temperature | 816°C |
| Element | Composition (%) |
|---|---|
| Cr | 18.0–20.0 |
| Ni | 8.0–10.5 |
| Mn | ≤2.0 |
| C | ≤0.08 |
| Si | ≤0.75 |
| Fe | bal |
ASTM A193 Grade B8 fasteners are manufactured from austenitic stainless steel, primarily grade 304, containing chromium and nickel as the principal alloying elements. Chromium, present at 18-20%, forms a passive oxide layer that provides excellent corrosion resistance, while nickel at 8-10.5% stabilizes the austenitic structure and enhances ductility and toughness. Trace elements such as manganese, silicon and carbon are carefully controlled to maintain weldability and mechanical consistency across production batches, ensuring reliable fastener performance in demanding environments.
These alloying characteristics translate into fasteners offering superior resistance to oxidation, pitting and general corrosion in chemical processing, marine and high-temperature applications. Grade B8 delivers dependable mechanical strength combined with excellent ductility, allowing reliable clamping force under thermal cycling and vibration. Its non-magnetic properties and resistance to sensitization make it ideal for pressure vessels, piping systems and flanged connections requiring long-term structural integrity and corrosion durability.
Specifications
ASTM A193 Grade B8 Fasteners are stainless steel fasteners specified for high-temperature service, defined by controlled mechanical properties, dimensional tolerances, and technical requirements under ASTM A193. Their performance depends on strength, hardness, and size compliance for critical reliable bolting applications.
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 35% min |
| Reduction of Area | 50% min |
| Hardness | 223 HB max |
| Modulus of Elasticity | 193 GPa |
| Thermal Expansion | 17.2 µm/m·°C |
| Thermal Conductivity | 16.2 W/m·K |
| Density | 8.0 g/cm³ |
| Melting Range | 1400-1450°C |
| Max Service Temperature | 816°C |
| Standard | Detail |
|---|---|
| Bolt Standard | ASME B18.2.1 |
| Stud Bolt Standard | ASME B16.5 / API 6A |
| Nut Standard | ASME B18.2.2 / ASTM A194 |
| Washer Standard | ASME B18.21.1 |
| Thread Form | UNC, UNF, 8UN Series |
| Diameter Range | M6 to M100 / 1/4" to 4" |
| Length Range | 20mm to 500mm |
| Available Forms | Bolts, Studs, Screws, Nuts, Washers |
| Custom Sizes | Available on request |
| Manufacturing Standards | ASTM A193 / ASME SA193 |
| Inspection Standards | NACE MR0175, PMI, RT, UT |
Applications
