Refractory Metal Mo-47.5Re
Mo-47.5Re is a high-rhenium molybdenum alloy that retains ductility after welding and cold work, combining high-temperature strength with fabricability unusual for a refractory metal.
Reference datasheet — Mo-47.5Re 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
Mo-47.5Re tempers and conditions
Mo-47.5Re is supplied in 4 conditions, soft to hard. SR 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 |
|---|---|---|---|---|---|---|
Annealed | Pick when maximum ductility, deep drawing or high-temperature creep service above the recrystallization temperature is required. | 490 | 860 | 26 | 23 HRC | — |
As-welded deposit | Reference condition for weld-joint design: Mo-47.5Re fusion welds stay ductile at room temperature, unlike unalloyed Mo. | 520 | 900 | 14 | 27 HRC | 5.7 % IACS |
SRDefault Stress relieved | Standard stocked condition for sheet, foil, rod and wire: high strength with usable room-temperature ductility for forming and welding. | 1,000 | 1,240 | 12 | 34 HRC | — |
Cold worked | Highest strength condition for fine wire, foil and springs where maximum strength and stiffness matter more than ductility. | 1,600 | 1,800 | 5 | 47 HRC | 5.4 % IACS |
What is Mo-47.5Re?
Mo-47.5Re is a high-rhenium molybdenum alloy that retains ductility after welding and cold work, combining high-temperature strength with fabricability unusual for a refractory metal. Typical values are 1000 MPa yield, 1240 MPa tensile, 12 % elongation, 34 HRC and service to 1400 °C, supplied cold-worked, stress-relieved, annealed or as-welded, with weldability rated 75 and formability 60. Machining is difficult (18) and the alloy is expensive, oxidizes in air above ~500 °C and can form σ-phase after long exposure at 800–1100 °C; unalloyed Mo or TZM is the lower-cost choice where weld ductility is not critical. Mo-47.5Re has a density of 13.5 g/cm³ (0.488 lb/in³), heavier than 80% of refractory metal grades. It melts at 2,500°C (4,532 °F). Mo-47.5Re has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 94% of refractory metal grades. Elongation at break is 12% and the elastic modulus is 360 GPa (52.2 Msi).
What is Mo-47.5Re used for?
- nuclear applications
- aerospace propulsion components
- high-temperature bellows and welded assemblies
Advantages
- High strength — 1,000 MPa (145 ksi), better than 94% of refractory metal grades
- Stiff — 360 GPa (52.2 Msi), better than 91% of refractory metal grades
- High service temperature — 1,400°C (2,552 °F), better than 81% of refractory metal grades
- Readily welded — 75/100, better than 81% of refractory metal grades
Limitations
- High embodied carbon — 330 kg CO₂/kg, worse than 99% of refractory metal grades
- Heavy — 13.5 g/cm³ (0.488 lb/in³), worse than 80% of refractory metal grades
- Difficult to machine — 18/100, worse than 80% of refractory metal grades
Mo-47.5Re properties
Typical room-temperature values for Mo-47.5Re-SR; bars are the position among refractory metal grades.
Physical3
Mo-47.5Re has a density of 13.5 g/cm³ (0.488 lb/in³), heavier than 80% of refractory metal grades. It melts at 2,500°C (4,532 °F).
Mechanical11
Mo-47.5Re has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 94% of refractory metal grades. Elongation at break is 12% and the elastic modulus is 360 GPa (52.2 Msi).
Thermal6
Mo-47.5Re is rated for continuous service to 1,400°C (2,552 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 56% of refractory metal grades. Thermal expansion is 5.7 µm/m·K (3.17 µin/in·°F).
Electrical3
Mo-47.5Re conducts electricity at 5.7 % IACS, worse than 51% of refractory metal grades.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 72% of refractory metal grades.
Sustainability3
Producing a kilogram of Mo-47.5Re takes about 5,000 MJ of energy and emits 330 kg of CO₂ — more than 99% of refractory metal grades. Typical recycled content is 40%.
Manufacturability8
Mo-47.5Re's machinability is poor (18/100, worse than 80% of refractory metal grades); weldability very good (75/100); 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. Mo-47.5Re is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Mo-47.5Re
Is Mo-47.5Re easy to machine?
Very abrasive and strongly work-hardening — use rigid setups, sharp carbide/CBN at low speed with heavy feed, or prefer EDM, grinding and laser cutting; avoid dwelling to prevent smearing.
Can Mo-47.5Re be welded?
GTAW or electron-beam weld in high-purity Ar/He glovebox or vacuum with scrupulously clean, low-C/O material; welds remain ductile at RT, but avoid contamination and prolonged 800–1100 °C exposure that promotes σ-phase.
Can Mo-47.5Re be formed, bent or molded?
Cold rolls to thin foil and draws to fine wire with 60–90 % reductions between vacuum/H₂ interpass anneals at 1400–1600 °C; bend radii in stress-relieved sheet should be ≥2t.
Mo-47.5Re 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 |
|---|---|---|
| Rehigh-Re composition near the room-temperature solubility limit; keeps ductility and weldability | 46.5 – 48.5 | 47.5 |
| Ctypical impurity limit | ≤ 0.01 | 0.01 |
| Otypical impurity limit | ≤ 0.01 | 0 |
| Ntypical impurity limit | ≤ 0 | 0 |
| Fetypical impurity limit | ≤ 0.01 | 0 |
| Nitypical impurity limit | ≤ 0.01 | 0 |
| Sitypical impurity limit | ≤ 0.01 | 0 |
| Mo | balance |
What surface finishes work on Mo-47.5Re?
Chemically etch or electropolish in alkaline/H₂SO₄-methanol baths; for oxidizing service above ~500 °C apply silicide, Ir or Pt-group protective coatings — no anodizing.
How much does Mo-47.5Re cost?
Mo-47.5Re 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.
Mo-47.5Re — frequently asked
What is Mo-47.5Re used for?
Mo-47.5Re is typically used for nuclear applications, aerospace propulsion components and high-temperature bellows and welded assemblies. In short: most weldable refractory alloy; ductile welds at room temperature; cold-rollable to thin foil.
What is the yield strength of Mo-47.5Re?
Mo-47.5Re has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 94% of refractory metal grades. Strength varies by condition: see the 4 listed tempers.
Is Mo-47.5Re easy to machine?
Not especially — machinability is rated poor (18/100, worse than 80% of refractory metal grades). Very abrasive and strongly work-hardening — use rigid setups, sharp carbide/CBN at low speed with heavy feed, or prefer EDM, grinding and laser cutting; avoid dwelling to prevent smearing.
Can Mo-47.5Re be welded?
Yes — weldability is rated very good (75/100). GTAW or electron-beam weld in high-purity Ar/He glovebox or vacuum with scrupulously clean, low-C/O material; welds remain ductile at RT, but avoid contamination and prolonged 800–1100 °C exposure that promotes σ-phase.
What surface finishes work on Mo-47.5Re?
Chemically etch or electropolish in alkaline/H₂SO₄-methanol baths; for oxidizing service above ~500 °C apply silicide, Ir or Pt-group protective coatings — no anodizing.
Can Mo-47.5Re be formed, bent or molded?
Cold rolls to thin foil and draws to fine wire with 60–90 % reductions between vacuum/H₂ interpass anneals at 1400–1600 °C; bend radii in stress-relieved sheet should be ≥2t.
What is the maximum service temperature of Mo-47.5Re?
Mo-47.5Re is rated for continuous use to about 1,400°C (2,552 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Mo-47.5Re-SR and Mo-47.5Re-CW?
SR is the default condition — standard stocked condition for sheet, foil, rod and wire: high strength with usable room-temperature ductility for forming and welding. CW: highest strength condition for fine wire, foil and springs where maximum strength and stiffness matter more than ductility. Yield strength is 1,000 MPa in SR versus 1,600 MPa in CW.
How much does Mo-47.5Re cost?
Mo-47.5Re 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
- Molybdenum-Rhenium (Mo-47.5Re) alloy sheet, rod and wire data — Rhenium Alloys, Inc. (2022)
- Molybdenum-rhenium alloys product information — Plansee SE (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Refractory Metals) — ASM International (1990)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Mo-Re system) — ASM International (1992)
- Refractory metal property compilations (Mo-Re thermal/electrical data) — CRC / CINDAS (2018)
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.