An austenitic and non-magnetic stainless steel that primarily consists of sulfur, chromium, and nickel. This type is considered a free-machining grade of stainless steel designed to have improved machinability without losing good mechanical and corrosion-resistant properties. The sulfur element does negatively impact its weldability, making 303 stainless steel more prone to cracking than other grades, and slightly lesser toughness.
While the sulfur results in lower weldability and reduces corrosion resistance a little, it is cost-effective for machining applications. Due to its non-magnetic properties and high machinability, it is often used in electronic components and industrial equipment as well.
| Property | Value | Notes |
|---|---|---|
| Material Type | Austenitic Stainless Steel | UNS S30300 |
| Density | 7.98 g/cm³ | 0.288 lb/in³ |
| Melting Point | ~1,400–1,450°C | ~2,550–2,650°F |
| Hardness (Brinell) | ~200 HB | Annealed condition |
| Tensile Strength | ~620 MPa | ~90,000 psi |
| Yield Strength | ~240 MPa | ~35,000 psi |
| Elongation at Break | ~35–50% | Slightly less ductile than 304 |
| Modulus of Elasticity | ~193 GPa | ~28 x 10⁶ psi |
| Corrosion Resistance | Good | Lower than 304 due to sulfur content |
| Magnetism | Non-magnetic (Generally) | May become slightly magnetic with cold working |
| Heat Treatment | Not Hardenable by Heat Treatment | Strength increases through cold working |
| Machinability | Excellent | Best among austenitic grades; enhanced with added sulfur |
| Weldability | Poor | Sulfur content causes hot cracking; not recommended for welding |
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