Precious Metal Pt95W5 Spring
Heat-treated state
Spring = spring hard
Fine wire for springs, clasp tongues and catch mechanisms requiring high elastic limit.
Values for the Spring condition
Other Pt95W5 tempers and conditions
Pt95W5 is listed in 6 conditions; see the grade overview at Pt95W5.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for bending, drawing, forming shanks and bezels before final work-hardening. | 190 | 420 | 30 | 119 HB | 4.9 % IACS |
CastDefault As cast | Standard condition for cast rings, prong heads and settings; best fluidity and good as-cast hardness. | 215 | 480 | 15 | 128 HB | 4.9 % IACS |
Quarter hard | Compromise temper for parts that still need some bending but higher stiffness. | 400 | 560 | 16 | 161 HB | 4.8 % IACS |
Half hard | For prongs, wire and bezels needing wear resistance with limited further forming. | 590 | 700 | 8 | 199 HB | 4.8 % IACS |
Full hard | Maximum hardness and wear resistance for drawn wire, prong stock and clasp components. | 780 | 860 | 3 | 22 HRC | 4.7 % IACS |
SpringThis page Spring hard | Fine wire for springs, clasp tongues and catch mechanisms requiring high elastic limit. | 880 | 960 | 2 | 26 HRC | 4.7 % IACS |
What is Pt95W5 Spring?
Pt95W5 Spring is Pt95W5 heat treated to Spring — fine wire for springs, clasp tongues and catch mechanisms requiring high elastic limit. Pt95W5 Spring has a yield strength of 880 MPa (128 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 101% of precious metal grades. Elongation at break is 2% and the elastic modulus is 190 GPa (27.6 Msi). Pt95W5 Spring has a density of 21.3 g/cm³ (0.77 lb/in³), heavier than 97% of precious metal grades. It melts at 1,790°C (3,254 °F). Cast is the default condition FabDigit quotes; Spring is available on request or by drawing note.
Advantages
- High strength — 880 MPa (128 ksi), better than 101% of precious metal grades
- Stiff — 190 GPa (27.6 Msi), better than 94% of precious metal grades
- Good corrosion resistance — 98/100, better than 90% of precious metal grades
Limitations
- Limited ductility — 2%, worse than 98% of precious metal grades
- Low electrical conductivity — 4.7 % IACS, worse than 98% of precious metal grades
- Heavy — 21.3 g/cm³ (0.77 lb/in³), worse than 97% of precious metal grades
- Limited formability — 15/100, worse than 97% of precious metal grades
- Poor heat conductor — 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 90% of precious metal grades
Pt95W5 Spring properties
Typical room-temperature values for Pt95W5 Spring; 20 are specific to this condition. Other listed values are Pt95W5 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Pt95W5 Spring has a density of 21.3 g/cm³ (0.77 lb/in³), heavier than 97% of precious metal grades. It melts at 1,790°C (3,254 °F).
Mechanical14
Pt95W5 Spring has a yield strength of 880 MPa (128 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 101% of precious metal grades. Elongation at break is 2% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
Pt95W5 Spring is rated for continuous service to 300°C (572 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 90% of precious metal grades. Thermal expansion is 8.9 µm/m·K (4.94 µin/in·°F).
Electrical3
Pt95W5 Spring conducts electricity at 4.7 % IACS, worse than 98% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (98/100), better than 90% of precious metal grades.
Sustainability3
Producing a kilogram of Pt95W5 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
Pt95W5 Spring's machinability is fair (38/100, worse than 66% of precious metal grades); weldability fair (40/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pt95W5 Spring
Is Pt95W5 easy to machine?
Sharp carbide or diamond tooling, low speed with generous lubricant; the alloy is gummy and work-hardens, so avoid dwelling and take positive cuts.
Can Pt95W5 be welded?
Laser and PUK welding are routine with matching Pt950W filler; use argon shielding and avoid prolonged high-temperature air exposure to limit tungsten oxidation.
Can Pt95W5 be formed, bent or molded?
Excellent investment-casting fluidity at ~1850–1900 °C pour into hot phosphate-bonded moulds; cold work between anneals at 1000–1200 °C in inert or reducing atmosphere.
What surface finishes work on Pt95W5?
Takes a bright, hard mirror polish with less drag than Pt-Cu; no anodizing, and rhodium plating is normally unnecessary.
Pt95W5 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 |
|---|---|---|
| Wsolid-solution strengthener | 4.5 – 5.5 | 5 |
| Iroptional trace/refining residual | ≤ 0.3 | — |
| Ruoptional trace | ≤ 0.3 | — |
| Other (each)impurities; total ≤0.5 to keep Pt ≥95.0 | ≤ 0.1 | — |
| Pt950 hallmark minimum fineness | ≥ 95 (balance) | — |
Pt95W5 Spring — frequently asked
What is Pt95W5 Spring used for?
Pt95W5 Spring is typically used for jewelry prong heads, ring settings and bezels, wear-resistant fine jewelry parts, spring-temper clasps and catches, cast platinum findings and drawn platinum wire for settings. In short: hardest-wearing Pt950 alloy; harder than Pt-Co; durable prong material.
What is the yield strength of Pt95W5 Spring?
Pt95W5 Spring has a typical yield strength of 880 MPa (128 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 101% of precious metal grades. Strength varies by condition: see the 6 listed tempers.
Is Pt95W5 Spring easy to machine?
Not especially — machinability is rated fair (38/100, worse than 66% of precious metal grades). Sharp carbide or diamond tooling, low speed with generous lubricant; the alloy is gummy and work-hardens, so avoid dwelling and take positive cuts.
Can Pt95W5 Spring be welded?
With care — weldability is rated fair (40/100). Laser and PUK welding are routine with matching Pt950W filler; use argon shielding and avoid prolonged high-temperature air exposure to limit tungsten oxidation.
What surface finishes work on Pt95W5 Spring?
Takes a bright, hard mirror polish with less drag than Pt-Cu; no anodizing, and rhodium plating is normally unnecessary.
Can Pt95W5 Spring be formed, bent or molded?
Excellent investment-casting fluidity at ~1850–1900 °C pour into hot phosphate-bonded moulds; cold work between anneals at 1000–1200 °C in inert or reducing atmosphere.
What is the maximum service temperature of Pt95W5 Spring?
Pt95W5 Spring 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 Pt95W5 Cast and Pt95W5 Spring?
Cast is the default condition — standard condition for cast rings, prong heads and settings; best fluidity and good as-cast hardness. Spring: fine wire for springs, clasp tongues and catch mechanisms requiring high elastic limit. Yield strength is 215 MPa in Cast versus 880 MPa in Spring.
Sources
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (precious metals) — ASM International (1990)
- Precious Metals Science and Technology / Platinum jewellery alloy metallurgy — IPMI (1991)
- Platinum jewellery casting alloy data (Pt950/W) — Platinum Guild International / refiners (2020)
- Pt-W binary phase diagram and physical property compilations — ASM Alloy Phase Diagram Database (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.