Precious Metal 830 Silver-O (Annealed)
Temper · default condition
Choose for raising, spinning, chasing, deep drawing and any heavy forming operation.
Values for the O condition
Other 830 Silver tempers and conditions
830 Silver is listed in 7 conditions; see the grade overview at 830 Silver.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefaultThis page Annealed | Choose for raising, spinning, chasing, deep drawing and any heavy forming operation. | 105 | 300 | 38 | 62 HB | 78 % IACS |
As fabricated | Lost-wax / centrifugal cast hollowware and jewellery components before work hardening. | 115 | 260 | 18 | 65 HB | 76 % IACS |
Quarter hard | Light stiffening for sheet that still needs bending and light forming after rolling. | 250 | 355 | 20 | 86 HB | 77 % IACS |
Half hard | Standard condition for flatware blanks, bezels and structural sheet parts that keep their shape. | 330 | 405 | 10 | 107 HB | 76 % IACS |
Full hard | Use for wire, tine ends and wear surfaces needing maximum as-rolled hardness without heat treatment. | 420 | 470 | 4 | 128 HB | 75 % IACS |
Pre-hardened | Solution ~730–750 °C, quench, then age 280–300 °C for maximum hardness in cast or formed parts (knife bolsters, hinges, springs). | 470 | 560 | 6 | 157 HB | 81 % IACS |
Spring hard | Spring wire and clips where elastic recovery matters; almost no further forming possible. | 480 | 525 | 2 | 143 HB | 74 % IACS |
What is 830 Silver-O?
830 Silver-O is 830 Silver in the O temper — choose for raising, spinning, chasing, deep drawing and any heavy forming operation. 830 Silver-O has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 82% of precious metal grades. Elongation at break is 38% and the elastic modulus is 78 GPa (11.3 Msi). 830 Silver-O has a density of 10.2 g/cm³ (0.368 lb/in³), lighter than 57% of precious metal grades. It melts at 779°C (1,434 °F).
Advantages
- Polishes to a fine finish — 96/100, better than 94% of precious metal grades
- Forms and bends easily — 95/100, better than 91% of precious metal grades
- Ductile — tolerates forming and impact — 38%, better than 88% of precious metal grades
- Conducts heat well — 335 W/m·K (193.6 BTU/hr·ft·°F), better than 86% of precious metal grades
- Easy to machine — 55/100, better than 86% of precious metal grades
Limitations
- Low stiffness — 78 GPa (11.3 Msi), worse than 90% of precious metal grades
- Low strength — 105 MPa (15.2 ksi), worse than 82% of precious metal grades
830 Silver-O properties
Typical room-temperature values for 830 Silver-O; 10 are specific to this condition. Other listed values are 830 Silver reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
830 Silver-O has a density of 10.2 g/cm³ (0.368 lb/in³), lighter than 57% of precious metal grades. It melts at 779°C (1,434 °F).
Mechanical11
830 Silver-O has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 82% of precious metal grades. Elongation at break is 38% and the elastic modulus is 78 GPa (11.3 Msi).
Thermal6
830 Silver-O is rated for continuous service to 300°C (572 °F). It conducts heat at 335 W/m·K (193.6 BTU/hr·ft·°F), better than 86% of precious metal grades. Thermal expansion is 19 µm/m·K (10.6 µin/in·°F).
Electrical3
830 Silver-O conducts electricity at 78 % IACS, better than 79% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 70% of precious metal grades.
Sustainability4
Producing a kilogram of 830 Silver-O takes about 1,250 MJ of energy and emits 90 kg of CO₂ — less than 64% of precious metal grades. Typical recycled content is 50%.
Manufacturability8
830 Silver-O's machinability is good (55/100, better than 86% of precious metal grades); weldability very good (70/100); formability excellent (95/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 830 Silver-O
Is 830 Silver easy to machine?
Very soft and gummy in the annealed state — use sharp, highly polished carbide or HSS tools, high speed, light feed and a light oil or alcohol mist; half-hard or age-hardened stock gives far better chip control and surface finish.
Can 830 Silver be welded?
Best joined by silver brazing (hard soldering) with cadmium-free Ag-Cu-Zn alloys; laser or PUK spot welding works well, while conventional arc welding is impractical because of the extreme thermal conductivity.
Can 830 Silver be formed, bent or molded?
Excellent cold formability when annealed at 600–650 °C and quenched — raise, spin, stamp or draw with interstage anneals every 40–50 % reduction; the alloy work-hardens noticeably faster than fine silver.
What surface finishes work on 830 Silver?
Polishes to a high mirror; expect firescale (Cu2O) after torch work — remove by pickling in dilute sulfuric acid and depletion-silvering, then protect with lacquer, anti-tarnish storage or rhodium plating.
830 Silver chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Agfineness 830/1000, legal minimum in Norway/Sweden/Denmark | 83 – 84 | 83 |
| Znoptional, casting/deoxidising addition | 0 – 1 | 0 |
| Cubalance; some modern melts substitute up to ~1 % Zn for deoxidation | ≥ 15.5 (balance) | — |
830 Silver-O — frequently asked
What is 830 Silver-O used for?
830 Silver-O is typically used for nordic silverware, jewelry and flatware. In short: traditional Nordic fineness; very high cold formability; lower-cost sterling alternative.
What is the yield strength of 830 Silver-O?
830 Silver-O has a typical yield strength of 105 MPa (15.2 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 82% of precious metal grades. Strength varies by condition: see the 7 listed tempers.
Is 830 Silver-O easy to machine?
Reasonably — machinability is rated good (55/100, better than 86% of precious metal grades). Very soft and gummy in the annealed state — use sharp, highly polished carbide or HSS tools, high speed, light feed and a light oil or alcohol mist; half-hard or age-hardened stock gives far better chip control and surface finish.
Can 830 Silver-O be welded?
Yes — weldability is rated very good (70/100). Best joined by silver brazing (hard soldering) with cadmium-free Ag-Cu-Zn alloys; laser or PUK spot welding works well, while conventional arc welding is impractical because of the extreme thermal conductivity.
What surface finishes work on 830 Silver-O?
Polishes to a high mirror; expect firescale (Cu2O) after torch work — remove by pickling in dilute sulfuric acid and depletion-silvering, then protect with lacquer, anti-tarnish storage or rhodium plating.
Can 830 Silver-O be formed, bent or molded?
Excellent cold formability when annealed at 600–650 °C and quenched — raise, spin, stamp or draw with interstage anneals every 40–50 % reduction; the alloy work-hardens noticeably faster than fine silver.
What is the maximum service temperature of 830 Silver-O?
830 Silver-O is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 830 Silver-O and 830 Silver-H08?
O is the default condition — choose for raising, spinning, chasing, deep drawing and any heavy forming operation. H08: spring wire and clips where elastic recovery matters; almost no further forming possible. Yield strength is 105 MPa in O versus 480 MPa in H08.
Sources
- EN ISO 9202 — Jewellery, fineness of precious metal alloys — ISO/CEN (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Silver and Silver Alloys) — ASM International (1990)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Ag-Cu system) — ASM International (1992)
- Precious metal alloy property tables (Ag-Cu jewellery alloys) — World Gold Council / Santa Fe Symposium proceedings (2015)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.