304 stainless is the default austenitic grade. If you do not have a specific reason to choose 316L or 17-4 PH, 304 is the right starting point — and it costs roughly 30 percent less than 316L.
Mechanical and physical properties
| Property | Value |
|---|---|
| Tensile strength | 515 MPa |
| Yield strength | 205 MPa |
| Elongation at break | 40% |
| Density | 8.00 g/cm³ |
| Modulus | 193 GPa |
| Hardness | ~90 HRB |
| Max service temperature | 870 °C |
| Pitting resistance (PRE) | ~18 |
| Machinability rating | Tough |
Process compatibility
| Process | Suitability | Notes |
|---|---|---|
| CNC milling | Good | Use rigid setup and proper coolant. |
| CNC turning | Good | Standard for shafts, rings. |
| Sheet metal | Excellent | Available in cold-rolled gauges. |
| Investment casting | Excellent | Common cast stainless for valves and pump bodies. |
| Welding | Excellent | Use 304L for welded fabrications to avoid sensitization. |
Typical applications
- Food and beverage equipment.
- Indoor architectural fittings.
- Light marine fittings.
- General industrial fasteners and structural parts.
Tradeoffs
Cheap and widely stocked, but pits in chloride-rich (marine) environments. For coastal use, switch to 316L.
Specifying it on Uretyco
- 1Pick 304 from the dropdown
Available in standard bar and plate sizes.
- 2Choose passivation
Per ASTM A967 if the part is exposed to corrosive service.
- 3Add brushed finish if cosmetic
Common on consumer-facing parts.
- 4Use 304L for welded assemblies
Lower carbon prevents sensitization at the welds.
Related materials
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