Precious Metal Pt95Ru5 Spring
Heat-treated state
ASTM B563
Spring = spring hard
Fine wire and strip for contact springs and probe elements requiring maximum elastic limit.
Values for the Spring 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 |
|---|---|---|---|---|---|---|
AnnealedDefault 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 |
SpringThis page 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 Spring?
Pt95Ru5 Spring is Pt95Ru5 heat treated to Spring — fine wire and strip for contact springs and probe elements requiring maximum elastic limit. Pt95Ru5 Spring has a yield strength of 780 MPa (113 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 100% of precious metal grades. Elongation at break is 1.5% and the elastic modulus is 188 GPa (27.3 Msi). Pt95Ru5 Spring 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). Annealed is the default condition FabDigit quotes; Spring is available on request or by drawing note.
Advantages
- High strength — 780 MPa (113 ksi), better than 100% of precious metal grades
- Stiff — 188 GPa (27.3 Msi), better than 94% of precious metal grades
- Good corrosion resistance — 99/100, better than 93% of precious metal grades
Limitations
- Limited ductility — 1.5%, worse than 99% of precious metal grades
- Limited formability — 15/100, worse than 97% of precious metal grades
- Heavy — 20.67 g/cm³ (0.747 lb/in³), worse than 95% of precious metal grades
- Low electrical conductivity — 5.2 % IACS, worse than 95% of precious metal grades
- Poor heat conductor — 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 94% of precious metal grades
Pt95Ru5 Spring properties
Typical room-temperature values for Pt95Ru5 Spring; 21 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 Spring 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 Spring has a yield strength of 780 MPa (113 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 100% of precious metal grades. Elongation at break is 1.5% and the elastic modulus is 188 GPa (27.3 Msi).
Thermal6
Pt95Ru5 Spring is rated for continuous service to 400°C (752 °F). It conducts heat at 28 W/m·K (16.2 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 Spring conducts electricity at 5.2 % IACS, worse than 95% 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 Spring 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 Spring's machinability is fair (45/100, better than 59% of precious metal grades); weldability good (60/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95Ru5 Spring
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 Spring — frequently asked
What is Pt95Ru5 Spring used for?
Pt95Ru5 Spring 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 Spring?
Pt95Ru5 Spring has a typical yield strength of 780 MPa (113 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 100% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95Ru5 Spring easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% 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 Spring be welded?
Yes — weldability is rated good (60/100). 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 Spring?
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 Spring 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 Spring?
Pt95Ru5 Spring is rated for continuous use to about 400°C (752 °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.