Precious Metal Pt95Ru5 Annealed
Temper · default condition
ASTM B563
Default stock condition for sheet, wire and tube that will be formed, drawn, spun or set into jewellery.
Values for the Annealed condition
Other Pt95Ru5 tempers and conditions
Pt95Ru5 is listed in 6 conditions; see the grade overview at Pt95Ru5.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page fully softened (recrystallised, ~900–1000 °C) | Default stock condition for sheet, wire and tube that will be formed, drawn, spun or set into jewellery. | 175 | 380 | 34 | 124 HB | 5.6 % IACS |
investment / centrifugal cast jewellery and blanks | Condition of cast jewellery mountings and cast contact blanks before finishing; coarser grain, lower ductility than wrought. | 185 | 350 | 18 | 128 HB | 5.5 % IACS |
Quarter hard | Choose when moderate stiffness is needed but the part still has to be bent or crimped. | 380 | 500 | 15 | 157 HB | 5.5 % IACS |
Half hard | Standard condition for contact blades, clips and machined components needing clean chip formation. | 520 | 620 | 6 | 185 HB | 5.4 % IACS |
Hardened | Use for wear-resistant electrical contacts, brushes and slip rings where maximum hardness matters more than ductility. | 690 | 760 | 3 | 20 HRC | 5.3 % IACS |
Spring hard | Fine wire and strip for contact springs and probe elements requiring maximum elastic limit. | 780 | 830 | 1.5 | 23 HRC | 5.2 % IACS |
What is Pt95Ru5 Annealed?
Pt95Ru5 Annealed is Pt95Ru5 in the Annealed temper — default stock condition for sheet, wire and tube that will be formed, drawn, spun or set into jewellery. Pt95Ru5 Annealed has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 62% of precious metal grades. Elongation at break is 34% and the elastic modulus is 186 GPa (27 Msi). Pt95Ru5 Annealed has a density of 20.67 g/cm³ (0.747 lb/in³), heavier than 95% of precious metal grades. It melts at 1,780°C (3,236 °F).
Advantages
- Stiff — 186 GPa (27 Msi), better than 93% of precious metal grades
- High service temperature — 900°C (1,652 °F), better than 93% of precious metal grades
- Good corrosion resistance — 99/100, better than 93% of precious metal grades
- Readily welded — 80/100, better than 87% of precious metal grades
- Ductile — tolerates forming and impact — 34%, better than 78% of precious metal grades
Limitations
- Heavy — 20.67 g/cm³ (0.747 lb/in³), worse than 95% of precious metal grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 94% of precious metal grades
- Low electrical conductivity — 5.6 % IACS, worse than 93% of precious metal grades
- High embodied carbon — 14,000 kg CO₂/kg, worse than 88% of precious metal grades
- Difficult to machine — 30/100, worse than 86% of precious metal grades
Pt95Ru5 Annealed properties
Typical room-temperature values for Pt95Ru5 Annealed; 10 are specific to this condition. Other listed values are Pt95Ru5 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Pt95Ru5 Annealed has a density of 20.67 g/cm³ (0.747 lb/in³), heavier than 95% of precious metal grades. It melts at 1,780°C (3,236 °F).
Mechanical11
Pt95Ru5 Annealed has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 62% of precious metal grades. Elongation at break is 34% and the elastic modulus is 186 GPa (27 Msi).
Thermal6
Pt95Ru5 Annealed is rated for continuous service to 900°C (1,652 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 94% of precious metal grades. Thermal expansion is 9.1 µm/m·K (5.06 µin/in·°F).
Electrical3
Pt95Ru5 Annealed conducts electricity at 5.6 % IACS, worse than 93% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (99/100), better than 93% of precious metal grades.
Sustainability4
Producing a kilogram of Pt95Ru5 Annealed takes about 240,000 MJ of energy and emits 14,000 kg of CO₂ — more than 91% of precious metal grades. Typical recycled content is 40%.
Manufacturability8
Pt95Ru5 Annealed's machinability is poor (30/100, worse than 86% of precious metal grades); weldability very good (80/100); formability excellent (85/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95Ru5 Annealed
Is Pt95Ru5 easy to machine?
Soft and gummy when annealed — machine in 1/2-hard or harder temper with sharp, high-rake carbide or HSS tools, light feeds, generous coolant, and capture all swarf for refining.
Can Pt95Ru5 be welded?
Excellent for resistance, laser and micro-TIG welding without filler in clean argon; avoid contamination by Fe, Si, P, S and carbon which cause hot shortness.
Can Pt95Ru5 be formed, bent or molded?
Very ductile when annealed: deep draws, rolls to foil and draws to fine wire; interanneal at 900–1000 °C in air or argon after ~50–60 % reduction.
What surface finishes work on Pt95Ru5?
Takes a bright, durable mirror polish with successively finer diamond/alumina compounds; no plating or passivation needed, and rhodium plating is generally unnecessary.
Pt95Ru5 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 |
|---|---|---|
| Rusolid-solution hardener | 4.5 – 5.5 | 5 |
| Other (total impurities)Ir, Pd, Rh, Fe, Cu residuals | ≤ 0.15 | 0.05 |
| Pttypically 950 ‰ fineness for jewellery hallmarking | ≥ 94.5 (balance) | — |
Pt95Ru5 Annealed — frequently asked
What is Pt95Ru5 Annealed used for?
Pt95Ru5 Annealed is typically used for fine jewelry, electrical contacts and corrosion-resistant fixtures. In short: lower-cost hardened platinum; most formable Pt950 grade; spring tempers available.
What is the yield strength of Pt95Ru5 Annealed?
Pt95Ru5 Annealed has a typical yield strength of 175 MPa (25.4 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 62% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95Ru5 Annealed easy to machine?
Not especially — machinability is rated poor (30/100, worse than 86% of precious metal grades). Soft and gummy when annealed — machine in 1/2-hard or harder temper with sharp, high-rake carbide or HSS tools, light feeds, generous coolant, and capture all swarf for refining.
Can Pt95Ru5 Annealed be welded?
Yes — weldability is rated very good (80/100). Excellent for resistance, laser and micro-TIG welding without filler in clean argon; avoid contamination by Fe, Si, P, S and carbon which cause hot shortness.
What surface finishes work on Pt95Ru5 Annealed?
Takes a bright, durable mirror polish with successively finer diamond/alumina compounds; no plating or passivation needed, and rhodium plating is generally unnecessary.
Can Pt95Ru5 Annealed be formed, bent or molded?
Very ductile when annealed: deep draws, rolls to foil and draws to fine wire; interanneal at 900–1000 °C in air or argon after ~50–60 % reduction.
What is the maximum service temperature of Pt95Ru5 Annealed?
Pt95Ru5 Annealed is rated for continuous use to about 900°C (1,652 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Pt95Ru5 Annealed and Pt95Ru5 Spring?
Annealed is the default condition — default stock condition for sheet, wire and tube that will be formed, drawn, spun or set into jewellery. Spring: fine wire and strip for contact springs and probe elements requiring maximum elastic limit. Yield strength is 175 MPa in Annealed versus 780 MPa in Spring.
Sources
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys and Special-Purpose Materials (precious metals section) — ASM International (1990)
- Platinum alloy technical data (Pt-Ru, Pt-Ir, Pt-Co series) — Johnson Matthey Noble Metals (2020)
- Platinum Metals Review — mechanical properties of platinum alloys — Johnson Matthey (2004)
- ASTM B563 — Palladium/precious-metal electrical contact alloy specification (cited alias) — ASTM International (2019)
- ASM Alloy Phase Diagram Database — Pt-Ru system — ASM International (2016)
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.