Refractory Metal R02002
UNS R02002 · ASTM B776 Grade 2, B737 Grade 2
Hafnium containing a higher residual zirconium content (up to a few percent) than reactor grade; the Hf/Zr ratio is not restricted since neutron absorption cross-section is not a concern in non-nuclear uses, making it a cheaper generic grade for industrial applications.
Reference datasheet — R02002 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 ANN condition
R02002 tempers and conditions
R02002 is supplied in 4 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefault Annealed | Default stocked condition: maximum ductility for forming, welding and machining of plasma electrodes and chemical parts. | 240 | 450 | 25 | 165 HB | — |
Hot Worked | Economical heavy-section form for further machining or re-melt stock; surface carries oxide/alpha case and is normally conditioned. | 310 | 500 | 20 | 185 HB | 5 % IACS |
Stress relieved | Compromise condition: keeps most cold-work strength while removing residual stress and distortion after machining. | 500 | 620 | 12 | 19 HRC | 5.1 % IACS |
Cold worked | Choose when higher strength, straightness and surface finish are needed and no severe forming follows. | 620 | 700 | 6 | 23 HRC | 5 % IACS |
Supply forms, finishes and certifications
Ways R02002 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Ingot | As-melted ingot / EB-button | Supply form |
What is R02002?
Hafnium containing a higher residual zirconium content (up to a few percent) than reactor grade; the Hf/Zr ratio is not restricted since neutron absorption cross-section is not a concern in non-nuclear uses, making it a cheaper generic grade for industrial applications. R02002 has a density of 13.31 g/cm³ (0.481 lb/in³), heavier than 77% of refractory metal grades. It melts at 2,233°C (4,051 °F). R02002 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 R02002 used for?
- Plasma cutting electrode tips
- Getter alloys
- High-temperature coatings and cermets
- Superalloy additive
- Research and specialty tooling
Limitations
- High embodied carbon — 130 kg CO₂/kg, worse than 83% of refractory metal grades
- 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
R02002 properties
Typical room-temperature values for R02002-ANN; bars are the position among refractory metal grades.
Physical3
R02002 has a density of 13.31 g/cm³ (0.481 lb/in³), heavier than 77% of refractory metal grades. It melts at 2,233°C (4,051 °F).
Mechanical12
R02002 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
R02002 is rated for continuous service to 400°C (752 °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 5.9 µm/m·K (3.28 µin/in·°F).
Electrical3
R02002 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.
Sustainability3
Producing a kilogram of R02002 takes about 2,000 MJ of energy and emits 130 kg of CO₂ — more than 83% of refractory metal grades. Typical recycled content is 20%.
Manufacturability8
R02002's machinability is poor (30/100, better than 54% of refractory metal grades); weldability very good (70/100); formability good (60/100).
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. R02002 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with R02002
Is R02002 easy to machine?
Machine like zirconium: slow speed, heavy positive-rake sharp carbide, deep cuts, flood coolant — never dry; collect chips wet, they are pyrophoric.
Can R02002 be welded?
GTAW/EB/laser only with full inert (Ar/He) chamber or trailing-shield coverage; keep O/N/H pickup low or the weld embrittles.
Can R02002 be formed, bent or molded?
Cold form annealed sheet with 3–5t bend radii and polished dies to avoid galling; warm form 200–400 °C for tighter radii, then stress relieve.
R02002 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; commercial grade may exceed reactor-grade practice — confirm with purchase order | ≤ 4.5 | 2.5 |
| OMain strengthening interstitial | ≤ 0.2 | 0.1 |
| C | ≤ 0.03 | 0.01 |
| N | ≤ 0.01 | 0 |
| H | ≤ 0.01 | 0 |
| Fe+Cr | ≤ 0.25 | 0.1 |
| Al | ≤ 0.01 | 0 |
| Ti | ≤ 0.05 | 0.01 |
| UNot restricted for commercial grade (restricted only in nuclear grade R02001) | — | |
| HfHf + Zr reported together; Hf/Zr ratio not restricted for commercial grade | balance |
What surface finishes work on R02002?
Pickle in HNO3/HF to strip oxide and alpha case; passivates naturally in air, can be electropolished or anodized for colour; no plating normally required.
Equivalent designations
Standards and trade names that resolve to Refractory Metal R02002 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B776 Grade 2B737 Grade 2
How much does R02002 cost?
R02002 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.
R02002 — frequently asked
What is R02002 used for?
R02002 is typically used for plasma cutting electrode tips, getter alloys, high-temperature coatings and cermets, superalloy additive and research and specialty tooling. In short: cheaper non-nuclear hafnium; unrestricted Hf/Zr ratio; plasma electrode grade.
What is the yield strength of R02002?
R02002 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 4 listed tempers.
Is R02002 easy to machine?
Not especially — machinability is rated poor (30/100, better than 54% of refractory metal grades). Machine like zirconium: slow speed, heavy positive-rake sharp carbide, deep cuts, flood coolant — never dry; collect chips wet, they are pyrophoric.
Can R02002 be welded?
Yes — weldability is rated very good (70/100). GTAW/EB/laser only with full inert (Ar/He) chamber or trailing-shield coverage; keep O/N/H pickup low or the weld embrittles.
What surface finishes work on R02002?
Pickle in HNO3/HF to strip oxide and alpha case; passivates naturally in air, can be electropolished or anodized for colour; no plating normally required.
Can R02002 be formed, bent or molded?
Cold form annealed sheet with 3–5t bend radii and polished dies to avoid galling; warm form 200–400 °C for tighter radii, then stress relieve.
What is the maximum service temperature of R02002?
R02002 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 R02002-ANN and R02002-CW?
ANN is the default condition — default stocked condition: maximum ductility for forming, welding and machining of plasma electrodes and chemical parts. CW: choose when higher strength, straightness and surface finish are needed and no severe forming follows. Yield strength is 240 MPa in ANN versus 620 MPa in CW.
How much does R02002 cost?
R02002 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 — Standard Specification for Hafnium and Hafnium Alloy Strip, Sheet, and Plate — ASTM International (2021)
- ASTM B737 — Standard Specification for Hafnium and Hafnium Alloy Bar, Rod, and Wire — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- CRC Handbook of Chemistry and Physics (hafnium physical constants) — CRC Press (2022)
- Hafnium metal mill products datasheet — ATI Wah Chang (2015)
- Mineral Commodity Summaries — Hafnium/Zirconium — USGS (2025)
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.