Stainless Steel 316L
316L, surgical/marine grade
Neutral silver, polishes to a near-mirror finish. Matte and brushed finishes are commonly used in contemporary jewellery
Composition
67% iron, 17% chromium, 12% nickel, 2.3% molybdenum, trace carbon (< 0.03%) and manganese
Physical properties
| Density | 8.00 g/cm³ | Weight per unit volume. Platinum is ~40% heavier than 18k gold at equal size |
|---|---|---|
| Melting range | 1375–1400 °C | Working temperature for alloys. Pure metals have a sharp melting point |
| Vickers hardness | 180 HV | Higher HV = greater scratch resistance in service |
| Mohs hardness | 6 | Approximate equivalent for comparative reference |
| Tensile strength | 540 MPa | Resistance to breaking under tension, relevant for prongs and fine settings |
| Tarnish resistance | Excellent | Surface oxidation / sulphidation under typical wear conditions |
| Workability | Good | Ease of forming, soldering, and fabricating under standard jewellery workshop conditions |
| Hypoallergenic | Partial risk | Likelihood of triggering skin reactions under normal wear |
Common uses
Watch cases and bracelets (industry standard), men's rings, body piercing jewellery, fashion accessories, medical devices, marine hardware
Hallmarking & identification
No precious metal hallmark. Marked 316L or 'Surgical Steel' in jewellery contexts. 'Surgical steel' is a marketing term; all 316L is surgical grade but the term has no regulatory definition in jewellery.
Virtually maintenance-free. Clean with warm soapy water or mild cleaner. Polishes easily with a soft cloth. Resistant to most chemicals including chlorine and sweat.
Market & pricing
Very low material cost compared to precious metals. Labour and finishing are the primary cost drivers. Extremely accessible, and the dominant metal in fashion and men's jewellery.