Tungsten Alloy W (99.95% CP Tungsten) Forged
Supply condition
UNS R07005 · ASTM B760 · GB W1
Forged = 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.
Values for the Forged condition
Other W (99.95% CP Tungsten) tempers and conditions
W (99.95% CP Tungsten) is listed in 5 conditions; see the grade overview at W (99.95% CP Tungsten).
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 |
ForgedThis page 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 |
What is W (99.95% CP Tungsten) Forged?
W (99.95% CP Tungsten) Forged is W (99.95% CP Tungsten) supplied in the Forged condition — heavy sections (crucibles, anodes, large shielding blocks) where the density and grain refinement of hot working are needed but full drawing is impractical. W (99.95% CP Tungsten) Forged has a yield strength of 700 MPa (102 ksi) and a tensile strength of 850 MPa (123 ksi) — weaker than 61% of tungsten alloy grades. Elongation at break is 2% and the elastic modulus is 400 GPa (58 Msi). W (99.95% CP Tungsten) Forged has a density of 19.2 g/cm³ (0.694 lb/in³), heavier than 62% of tungsten alloy grades. It melts at 3,422°C (6,192 °F). SR is the default condition FabDigit quotes; Forged is available on request or by drawing note.
Advantages
- High service temperature — 1,250°C (2,282 °F), better than 76% of tungsten alloy grades
W (99.95% CP Tungsten) Forged properties
Typical room-temperature values for W (99.95% CP Tungsten) Forged; 23 are specific to this condition. Other listed values are W (99.95% CP Tungsten) reference data and may not represent this condition. Bars are the position among tungsten alloy grades.
Physical3
W (99.95% CP Tungsten) Forged has a density of 19.2 g/cm³ (0.694 lb/in³), heavier than 62% of tungsten alloy grades. It melts at 3,422°C (6,192 °F).
Mechanical15
W (99.95% CP Tungsten) Forged has a yield strength of 700 MPa (102 ksi) and a tensile strength of 850 MPa (123 ksi) — weaker than 61% of tungsten alloy grades. Elongation at break is 2% and the elastic modulus is 400 GPa (58 Msi).
Thermal6
W (99.95% CP Tungsten) Forged is rated for continuous service to 1,250°C (2,282 °F). It conducts heat at 170 W/m·K (98.2 BTU/hr·ft·°F), better than 81% of tungsten alloy grades. Thermal expansion is 4.5 µm/m·K (2.5 µin/in·°F).
Electrical3
W (99.95% CP Tungsten) Forged 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) Forged 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) Forged's machinability is not recommended (12/100, better than 67% of tungsten alloy grades); weldability not recommended (12/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with W (99.95% CP Tungsten) Forged
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.
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.
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) | — |
W (99.95% CP Tungsten) Forged — frequently asked
What is W (99.95% CP Tungsten) Forged used for?
W (99.95% CP Tungsten) Forged 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) Forged?
W (99.95% CP Tungsten) Forged has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 850 MPa (123 ksi) — weaker than 61% of tungsten alloy grades. Strength varies by condition: see the 5 listed tempers.
Is W (99.95% CP Tungsten) Forged 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) Forged 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) Forged?
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) Forged 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) Forged?
W (99.95% CP Tungsten) Forged is rated for continuous use to about 1,250°C (2,282 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.