Tungsten Alloy W (99.95% CP Tungsten)
UNS R07005 · ASTM B760 · GB W1
W (99.95% CP tungsten) is unalloyed powder-metallurgy tungsten to ASTM B760 / UNS R07005 (W1), supplied as sheet, rod and wire in sintered, stress-relieved, rolled, forged and recrystallised conditions.
Reference datasheet — W (99.95% CP Tungsten) is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SR condition
W (99.95% CP Tungsten) tempers and conditions
W (99.95% CP Tungsten) is supplied in 5 conditions, soft to hard. SR is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sintered | Lowest-cost blank for crucibles, weights and shielding where strength and surface finish are secondary; residual porosity ~2–5%. | 420 | 500 | 0 | 33 HRC | 27 % IACS |
Recrystallized / annealed | Use where dimensional stability at very high temperature (>1400 °C, vacuum/inert) matters more than room-temperature toughness — the material is fully brittle cold. | 450 | 550 | 0 | 35 HRC | 32 % IACS |
Forged / rotary-swaged bar and blocks | Heavy sections (crucibles, anodes, large shielding blocks) where the density and grain refinement of hot working are needed but full drawing is impractical. | 700 | 850 | 2 | 38 HRC | 31 % IACS |
SRDefault Stress relieved | The standard stocked condition for tungsten rod, bar and electrodes — highest usable room-temperature strength with a fine deformed grain structure. | 750 | 950 | 2 | 39 HRC | 31 % IACS |
Rolled sheet/plate/foil | Choose for shielding sheet, sputtering targets, boat/heat-shield stock and foil; strongest in the rolling direction, anisotropic and notch sensitive. | 1,000 | 1,200 | 3 | 42 HRC | 30 % IACS |
Supply forms, finishes and certifications
Ways W (99.95% CP Tungsten) is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WIRE | Drawn wire | Supply form |
What is W (99.95% CP Tungsten)?
W (99.95% CP tungsten) is unalloyed powder-metallurgy tungsten to ASTM B760 / UNS R07005 (W1), supplied as sheet, rod and wire in sintered, stress-relieved, rolled, forged and recrystallised conditions. Engineers select it for the highest melting point of any metal, high density and stiffness, 173 W/m·K thermal conductivity and 31% IACS, with 750 MPa yield, 950 MPa tensile and 39 HRC. Room-temperature elongation is only 2% and machinability rates 12, so parts are ground or EDM'd; oxidation limits air service to about 1200 °C and fusion welds recrystallise brittle. Choose W-25Re where weld or bend ductility is needed. W (99.95% CP Tungsten) has a density of 19.25 g/cm³ (0.695 lb/in³), heavier than 76% of tungsten alloy grades. It melts at 3,422°C (6,192 °F). W (99.95% CP Tungsten) has a yield strength of 750 MPa (109 ksi) and a tensile strength of 950 MPa (138 ksi) — weaker than 53% of tungsten alloy grades. Elongation at break is 2% and the elastic modulus is 400 GPa (58 Msi).
What is W (99.95% CP Tungsten) used for?
- Furnace heating elements
- X-ray targets
- Radiation shielding
- Electrical contacts
- Sputtering targets
W (99.95% CP Tungsten) properties
Typical room-temperature values for W (99.95% CP Tungsten)-SR; bars are the position among tungsten alloy grades.
Physical3
W (99.95% CP Tungsten) has a density of 19.25 g/cm³ (0.695 lb/in³), heavier than 76% of tungsten alloy grades. It melts at 3,422°C (6,192 °F).
Mechanical15
W (99.95% CP Tungsten) has a yield strength of 750 MPa (109 ksi) and a tensile strength of 950 MPa (138 ksi) — weaker than 53% of tungsten alloy grades. Elongation at break is 2% and the elastic modulus is 400 GPa (58 Msi).
Thermal6
W (99.95% CP Tungsten) is rated for continuous service to 1,200°C (2,192 °F). It conducts heat at 173 W/m·K (100 BTU/hr·ft·°F), better than 88% of tungsten alloy grades. Thermal expansion is 4.5 µm/m·K (2.5 µin/in·°F).
Electrical3
W (99.95% CP Tungsten) conducts electricity at 31 % IACS, better than 83% of tungsten alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), better than 64% of tungsten alloy grades.
Sustainability4
Producing a kilogram of W (99.95% CP Tungsten) takes about 400 MJ of energy and emits 27 kg of CO₂ — more than 74% of tungsten alloy grades. Typical recycled content is 30%.
Manufacturability8
W (99.95% CP Tungsten)'s machinability is not recommended (12/100, better than 67% of tungsten alloy grades); weldability not recommended (12/100); formability not recommended (8/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the tungsten alloy family
Yield strength against density for every tungsten alloy grade FabDigit runs. W (99.95% CP Tungsten) is highlighted; hover a dot for its name, or open the interactive family chart.
Working with W (99.95% CP Tungsten)
Is W (99.95% CP Tungsten) easy to machine?
Treat as a brittle hard metal: grind, EDM or wire-EDM wherever possible; if turning/milling, use rigid setups, sharp micrograin carbide or CBN, low speed with heavy positive rake, and preheat (200–400 °C) for interrupted cuts to avoid chipping.
Can W (99.95% CP Tungsten) be welded?
Electron-beam or GTAW under vacuum/high-purity argon only; the fusion and heat-affected zones recrystallize and are essentially brittle at room temperature, so mechanical fastening or vacuum brazing (Ni, Cu, Ag-Cu, active fillers) is preferred.
Can W (99.95% CP Tungsten) be formed, bent or molded?
No practical cold forming — bend, deep-draw or coin only above the ductile-to-brittle transition (typically 300–600 °C, hotter for thick or recrystallized stock); most shapes are made by PM pressing plus hot rolling/swaging or by grinding from blank.
W (99.95% CP Tungsten) 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 |
|---|---|---|
| Mousual largest metallic impurity | ≤ 0.01 | 0 |
| C | ≤ 0 | 0 |
| Ohigher in sintered-only product | ≤ 0.01 | 0 |
| Fe | ≤ 0 | 0 |
| Ni | ≤ 0 | 0 |
| Si | ≤ 0 | 0 |
| Al | ≤ 0 | 8×10⁻⁴ |
| Ca | ≤ 0 | 5×10⁻⁴ |
| Mg | ≤ 0 | 5×10⁻⁴ |
| Cu | ≤ 5×10⁻⁴ | 2×10⁻⁴ |
| N | ≤ 0 | 5×10⁻⁴ |
| H | ≤ 5×10⁻⁴ | 2×10⁻⁴ |
| Wminimum on a metallic basis per ASTM B760 / GB/T 3875 | ≥ 99.95 (balance) |
What surface finishes work on W (99.95% CP Tungsten)?
Lap/diamond-polish for target and mirror surfaces; electropolishing in dilute NaOH is used for wire and probes; for oxidation protection above 500 °C apply silicide, CVD or electroless-Ni coatings — anodizing does not apply.
Equivalent designations
Standards and trade names that resolve to Tungsten Alloy W (99.95% CP Tungsten) in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R07005
- ASTM
- B760
- GB (China)
- W1
- Similar grades
- 15501
How much does W (99.95% CP Tungsten) cost?
W (99.95% CP Tungsten) is a high-cost tungsten alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
W (99.95% CP Tungsten) — frequently asked
What is W (99.95% CP Tungsten) used for?
W (99.95% CP Tungsten) is typically used for furnace heating elements, X-ray targets, radiation shielding, electrical contacts and sputtering targets. In short: highest melting point metal; dense radiation shielding; brittle at room temperature.
What is the yield strength of W (99.95% CP Tungsten)?
W (99.95% CP Tungsten) has a typical yield strength of 750 MPa (109 ksi) and a tensile strength of 950 MPa (138 ksi) — weaker than 53% of tungsten alloy grades. Strength varies by condition: see the 5 listed tempers.
Is W (99.95% CP Tungsten) easy to machine?
Not especially — machinability is rated not recommended (12/100, better than 67% of tungsten alloy grades). Treat as a brittle hard metal: grind, EDM or wire-EDM wherever possible; if turning/milling, use rigid setups, sharp micrograin carbide or CBN, low speed with heavy positive rake, and preheat (200–400 °C) for interrupted cuts to avoid chipping.
Can W (99.95% CP Tungsten) be welded?
Not readily — weldability is rated not recommended (12/100). Electron-beam or GTAW under vacuum/high-purity argon only; the fusion and heat-affected zones recrystallize and are essentially brittle at room temperature, so mechanical fastening or vacuum brazing (Ni, Cu, Ag-Cu, active fillers) is preferred.
What surface finishes work on W (99.95% CP Tungsten)?
Lap/diamond-polish for target and mirror surfaces; electropolishing in dilute NaOH is used for wire and probes; for oxidation protection above 500 °C apply silicide, CVD or electroless-Ni coatings — anodizing does not apply.
Can W (99.95% CP Tungsten) be formed, bent or molded?
No practical cold forming — bend, deep-draw or coin only above the ductile-to-brittle transition (typically 300–600 °C, hotter for thick or recrystallized stock); most shapes are made by PM pressing plus hot rolling/swaging or by grinding from blank.
What is the maximum service temperature of W (99.95% CP Tungsten)?
W (99.95% CP Tungsten) is rated for continuous use to about 1,200°C (2,192 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between W (99.95% CP Tungsten)-SR and W (99.95% CP Tungsten) SINT?
SR is the default condition — the standard stocked condition for tungsten rod, bar and electrodes — highest usable room-temperature strength with a fine deformed grain structure. SINT: lowest-cost blank for crucibles, weights and shielding where strength and surface finish are secondary; residual porosity ~2–5%. Yield strength is 750 MPa in SR versus 420 MPa in SINT.
How much does W (99.95% CP Tungsten) cost?
W (99.95% CP Tungsten) is a high-cost tungsten alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM B760 — Standard Specification for Tungsten Plate, Sheet, and Foil — ASTM International (2022)
- ASTM B777 / UNS R07005 designation data — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Refractory Metals) — ASM International (1990)
- Tungsten sheet, rod and wire material properties — Plansee SE / Midwest Tungsten Service (2023)
- CRC Handbook of Chemistry and Physics — physical constants of tungsten — CRC Press (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.