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| UNS Number | S30400 / S30403 / S30409 |
| ASTM/ASME Standard | ASTM A193/A194, ASME SA193/SA194 |
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Density | 8.00 g/cm³ |
| Max Service Temperature | 870°C (intermittent) |
| Element | Composition (%) |
|---|---|
| Cr | 18.0–20.0 |
| Ni | 8.0–10.5 |
| Mn | ≤2.0 |
| C | ≤0.08 |
| Si | ≤0.75 |
| P | ≤0.045 |
| S | ≤0.030 |
SS 304/304L/304H fasteners derive their performance from a balanced composition of chromium (18-20%) and nickel (8-10.5%), which forms a stable passive oxide layer responsible for excellent corrosion resistance. Carbon content differentiates the three variants: standard 304 offers moderate carbon levels, 304L features reduced carbon for improved weldability and resistance to sensitization, while 304H contains higher carbon for enhanced high-temperature strength. Manganese and silicon additions further support hot-working characteristics and oxidation resistance during manufacturing.
These compositional advantages translate into fasteners with superior resistance to atmospheric, chemical and marine corrosion, making them ideal for demanding industrial environments. The austenitic structure provides excellent ductility, toughness and non-magnetic properties across a wide temperature range. 304H variants deliver superior creep and stress-rupture strength for elevated-temperature service, while 304L ensures reliable performance in welded assemblies. Combined, these grades offer engineers durable, low-maintenance fastening solutions suited for piping, pressure vessels, structural and process industry applications.
Specifications
SS 304 / 304L / 304H Fasteners are corrosion-resistant stainless steel components specified by their mechanical strength, temperature performance, and dimensional tolerances across bolts, nuts, washers, and studs. Their technical data centers on tensile and yield behavior, while alloy variant selection determines service suitability.
| Tensile Strength | 515 MPa min |
| Yield Strength (0.2% Offset) | 205 MPa min |
| Elongation | 35% min |
| Reduction of Area | 50% min |
| Hardness | ≤ 217 HB / 96 HRB |
| Modulus of Elasticity | 193 GPa |
| Thermal Conductivity | 16.2 W/m·K |
| Melting Range | 1400-1450°C |
| Max Service Temperature | 870°C (intermittent) |
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B16.5, ASTM A193 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M3 to M100 / 1/8" to 4" |
| Length Range | 10mm to 500mm |
| Available Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
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