Refractory Metal Hafnium Hf-1 (R02001)
UNS R02001 · ASTM B776, B777
Standard commercially pure hafnium metal (containing residual zirconium) used where high melting point, corrosion resistance, and refractory properties are needed outside strict nuclear-purity requirements.
Reference datasheet — Hafnium Hf-1 (R02001) 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 Annealed condition
Hafnium Hf-1 (R02001) tempers and conditions
Hafnium Hf-1 (R02001) is supplied in 6 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
vacuum arc remelted / EB-melted ingot | Ingot/consumable stock for remelting into superalloys or for further hot working, not a structural condition. | 200 | 400 | 20 | 150 HB | 5.2 % IACS |
AnnealedDefault recrystallized (mill-annealed sheet, plate, bar) | Standard stocked condition: maximum ductility for forming, machining and welding. | 240 | 450 | 25 | 165 HB | — |
Hot Worked | Pick for thick plate and forged shapes where a final anneal is not required. | 300 | 480 | 20 | 11 HRC | 5.2 % IACS |
Cold Worked and Stress Relieved | Compromise condition: most cold-work strength retained with restored dimensional stability and some ductility. | 500 | 600 | 10 | 19 HRC | 5.1 % IACS |
Cold worked | Use for springy foil/strip and where higher strength and stiffness-per-thickness are needed. | 580 | 650 | 6 | 24 HRC | 5 % IACS |
Cold drawn | Choose for drawn wire (electrodes, getters, filaments) needing high strength and straightness. | 620 | 700 | 5 | 26 HRC | 4.9 % IACS |
What is Hafnium Hf-1 (R02001)?
Standard commercially pure hafnium metal (containing residual zirconium) used where high melting point, corrosion resistance, and refractory properties are needed outside strict nuclear-purity requirements. Hafnium Hf-1 (R02001) has a density of 13.31 g/cm³ (0.481 lb/in³), heavier than 77% of refractory metal grades. It melts at 2,200°C (3,992 °F). Hafnium Hf-1 (R02001) has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 76% of refractory metal grades. Elongation at break is 25% and the elastic modulus is 138 GPa (20 Msi).
What is Hafnium Hf-1 (R02001) used for?
- plasma cutting electrode tips
- superalloy additive for turbine blades
- chemical process equipment
- capacitor dielectric films
- high-temperature coatings
Limitations
- Heavy — 13.31 g/cm³ (0.481 lb/in³), worse than 77% of refractory metal grades
- Low strength — 240 MPa (34.8 ksi), worse than 76% of refractory metal grades
Hafnium Hf-1 (R02001) properties
Typical room-temperature values for Hafnium Hf-1 (R02001)-Annealed; bars are the position among refractory metal grades.
Physical3
Hafnium Hf-1 (R02001) has a density of 13.31 g/cm³ (0.481 lb/in³), heavier than 77% of refractory metal grades. It melts at 2,200°C (3,992 °F).
Mechanical10
Hafnium Hf-1 (R02001) has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 76% of refractory metal grades. Elongation at break is 25% and the elastic modulus is 138 GPa (20 Msi).
Thermal6
Hafnium Hf-1 (R02001) is rated for continuous service to 500°C (932 °F). It conducts heat at 23 W/m·K (13.3 BTU/hr·ft·°F), worse than 61% of refractory metal grades. Thermal expansion is 6 µm/m·K (3.33 µin/in·°F).
Electrical3
Hafnium Hf-1 (R02001) conducts electricity at 5.2 % IACS, worse than 55% of refractory metal grades.
Chemical & Environmental2
Corrosion resistance is excellent (85/100), better than 52% of refractory metal grades.
Manufacturability8
Hafnium Hf-1 (R02001)'s machinability is poor (30/100, better than 54% of refractory metal grades); weldability good (60/100); formability good (65/100).
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 refractory metal family
Yield strength against density for every refractory metal grade FabDigit runs. Hafnium Hf-1 (R02001) is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hafnium Hf-1 (R02001)
Is Hafnium Hf-1 (R02001) easy to machine?
Machine like zirconium: sharp positive-rake tools, slow-to-moderate speeds with heavy feed, flood coolant to avoid galling, and collect chips/fines wet — dry swarf is pyrophoric.
Can Hafnium Hf-1 (R02001) be welded?
GTAW/EBW/laser only with full inert-gas trailing shields or a vacuum/glovebox; any O, N or H pickup embrittles the weld, and cleanliness must be surgical.
Can Hafnium Hf-1 (R02001) be formed, bent or molded?
Cold forms and rolls to foil with generous bend radii (hcp texture gives anisotropy and springback); hot work 700–1000 °C with protection or canning for heavy reductions.
Hafnium Hf-1 (R02001) 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 |
|---|---|---|
| Zrresidual zirconium allowed in commercial grade R02001 (nuclear grades restrict Zr and B) | ≤ 4.5 | 2.5 |
| Omax, ppm-level control governs strength/ductility | ≤ 0.13 | 0.08 |
| Fe | ≤ 0.05 | |
| C | ≤ 0.02 | |
| N | ≤ 0.01 | |
| H | ≤ 0 | |
| Al | ≤ 0.01 | |
| Cr | ≤ 0.01 | |
| Nb | ≤ 0.01 | |
| Ti | ≤ 0.01 | |
| W | ≤ 0.01 | |
| Umax (3 ppm) | ≤ 3×10⁻⁴ | |
| Hfbalance; Hf+Zr essentially 100 % less impurities | balance |
What surface finishes work on Hafnium Hf-1 (R02001)?
Pickle in HNO3–HF mixtures to remove oxide/alpha case, then passivate in nitric; the natural oxide is protective, so plating and painting are rarely used and anodic colouring is only decorative.
Equivalent designations
Standards and trade names that resolve to Refractory Metal Hafnium Hf-1 (R02001) in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R02001
- ASTM
- B776B777
- Also called
- Hf-1
How much does Hafnium Hf-1 (R02001) cost?
Hafnium Hf-1 (R02001) is a high-cost refractory metal ($$$$), 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.
Hafnium Hf-1 (R02001) — frequently asked
What is Hafnium Hf-1 (R02001) used for?
Hafnium Hf-1 (R02001) is typically used for plasma cutting electrode tips, superalloy additive for turbine blades, chemical process equipment, capacitor dielectric films and high-temperature coatings. In short: standard commercial-purity hafnium; plasma cutting electrode metal; non-nuclear-purity grade.
What is the yield strength of Hafnium Hf-1 (R02001)?
Hafnium Hf-1 (R02001) has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 76% of refractory metal grades. Strength varies by condition: see the 6 listed tempers.
Is Hafnium Hf-1 (R02001) easy to machine?
Not especially — machinability is rated poor (30/100, better than 54% of refractory metal grades). Machine like zirconium: sharp positive-rake tools, slow-to-moderate speeds with heavy feed, flood coolant to avoid galling, and collect chips/fines wet — dry swarf is pyrophoric.
Can Hafnium Hf-1 (R02001) be welded?
Yes — weldability is rated good (60/100). GTAW/EBW/laser only with full inert-gas trailing shields or a vacuum/glovebox; any O, N or H pickup embrittles the weld, and cleanliness must be surgical.
What surface finishes work on Hafnium Hf-1 (R02001)?
Pickle in HNO3–HF mixtures to remove oxide/alpha case, then passivate in nitric; the natural oxide is protective, so plating and painting are rarely used and anodic colouring is only decorative.
Can Hafnium Hf-1 (R02001) be formed, bent or molded?
Cold forms and rolls to foil with generous bend radii (hcp texture gives anisotropy and springback); hot work 700–1000 °C with protection or canning for heavy reductions.
What is the maximum service temperature of Hafnium Hf-1 (R02001)?
Hafnium Hf-1 (R02001) is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hafnium Hf-1 (R02001) Annealed and Hafnium Hf-1 (R02001)-CD?
Annealed is the default condition — standard stocked condition: maximum ductility for forming, machining and welding. CD: choose for drawn wire (electrodes, getters, filaments) needing high strength and straightness. Yield strength is 240 MPa in Annealed versus 620 MPa in CD.
How much does Hafnium Hf-1 (R02001) cost?
Hafnium Hf-1 (R02001) is a high-cost refractory metal ($$$$), 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 B776 — Hafnium and Hafnium Alloy Strip, Sheet, Plate and Foil — ASTM International (2021)
- ASTM B777 — Hafnium and Hafnium Alloy Bar, Rod and Wire — ASTM International (2021)
- ATI Hafnium technical data sheet — ATI (Allegheny Technologies / Wah Chang) (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (refractory & reactive metals) — ASM International (1990)
- CRC Handbook of Chemistry and Physics — physical properties of hafnium — CRC Press (2020)
- ASM Handbook Vol. 13B — Corrosion: Materials (zirconium and hafnium) — ASM International (2005)
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.