Precious Metal 830 Silver-H08
Supply condition
H08 = spring hard
Spring wire and clips where elastic recovery matters; almost no further forming possible.
Values for the H08 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 |
|---|---|---|---|---|---|---|
ODefault 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 |
H08This page 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-H08?
830 Silver-H08 is 830 Silver supplied in the H08 condition — spring wire and clips where elastic recovery matters; almost no further forming possible. 830 Silver-H08 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 97% of precious metal grades. Elongation at break is 2% and the elastic modulus is 78 GPa (11.3 Msi). 830 Silver-H08 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). O is the default condition FabDigit quotes; H08 is available on request or by drawing note.
Advantages
- Easy to machine — 70/100, better than 101% of precious metal grades
- High strength — 480 MPa (69.6 ksi), better than 97% of precious metal grades
- Polishes to a fine finish — 96/100, better than 94% of precious metal grades
- Conducts heat well — 322 W/m·K (186 BTU/hr·ft·°F), better than 83% of precious metal grades
- High electrical conductivity — 74 % IACS, better than 77% of precious metal grades
Limitations
- Limited service temperature — 100°C (212 °F), worse than 100% of precious metal grades
- Limited ductility — 2%, worse than 98% of precious metal grades
- Limited formability — 20/100, worse than 96% of precious metal grades
- Low stiffness — 78 GPa (11.3 Msi), worse than 90% of precious metal grades
830 Silver-H08 properties
Typical room-temperature values for 830 Silver-H08; 20 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-H08 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-H08 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 97% of precious metal grades. Elongation at break is 2% and the elastic modulus is 78 GPa (11.3 Msi).
Thermal6
830 Silver-H08 is rated for continuous service to 100°C (212 °F). It conducts heat at 322 W/m·K (186 BTU/hr·ft·°F), better than 83% of precious metal grades. Thermal expansion is 19 µm/m·K (10.6 µin/in·°F).
Electrical3
830 Silver-H08 conducts electricity at 74 % IACS, better than 77% 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-H08 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-H08's machinability is very good (70/100, better than 101% of precious metal grades); weldability good (58/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 830 Silver-H08
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-H08 — frequently asked
What is 830 Silver-H08 used for?
830 Silver-H08 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-H08?
830 Silver-H08 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 97% of precious metal grades. Strength varies by condition: see the 7 listed tempers.
Is 830 Silver-H08 easy to machine?
Yes — machinability is rated very good (70/100, better than 101% 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-H08 be welded?
Yes — weldability is rated good (58/100). 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-H08?
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-H08 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-H08?
830 Silver-H08 is rated for continuous use to about 100°C (212 °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.