Refractory Metal Mo-0.5Ti-RX (Recrystallized)
Heat-treated state
ASTM B387 Grade 361
Use for long-service high-temperature parts needing dimensional stability and no residual stress after full annealing above ~1400 °C; strength falls and room-temperature brittleness rules out impact loads after assembly.
Values for the RX condition
Other Mo-0.5Ti tempers and conditions
Mo-0.5Ti is listed in 4 conditions; see the grade overview at Mo-0.5Ti.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
RXThis page Recrystallized | Use for long-service high-temperature parts needing dimensional stability and no residual stress after full annealing above ~1400 °C; strength falls and room-temperature brittleness rules out impact loads after assembly. | 420 | 560 | 30 | 180 HB | 130 W/m·K |
hot worked (forged or hot-extruded) bar and billet | Pick for large-section forged bar and die blanks as hot forged or hot extruded; partial recovery places the 540 MPa yield between the stress-relieved and recrystallized states. | 540 | 680 | 22 | 20 HRC | 29 % IACS |
SRDefault Stress relieved | Pick this as-worked, 900–1200 °C stress-relieved supply state for bar and plate: the retained worked fiber structure gives 620 MPa yield and usable room-temperature toughness for 1000–1400 °C structures and dies. | 620 | 760 | 20 | 25 HRC | 126 W/m·K |
Cold worked | Choose for wire, thin rod and sheet supplied heavily swaged or rolled without anneal, where strength peaks near 900 MPa yield; accept 8% elongation and pronounced anisotropy. | 900 | 1,000 | 8 | 32 HRC | 26 % IACS |
What is Mo-0.5Ti-RX?
Mo-0.5Ti-RX is Mo-0.5Ti heat treated to RX — use for long-service high-temperature parts needing dimensional stability and no residual stress after full annealing above ~1400 °C; strength falls and room-temperature brittleness rules out impact loads after assembly. Mo-0.5Ti-RX has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 66% of refractory metal grades. Elongation at break is 30% and the elastic modulus is 320 GPa (46.4 Msi). Mo-0.5Ti-RX has a density of 10.2 g/cm³ (0.368 lb/in³), heavier than 63% of refractory metal grades. It melts at 2,620°C (4,748 °F). SR is the default condition FabDigit quotes; RX is available on request or by drawing note.
Advantages
- High service temperature — 1,600°C (2,912 °F), better than 90% of refractory metal grades
- Ductile — tolerates forming and impact — 30%, better than 86% of refractory metal grades
- Conducts heat well — 130 W/m·K (75.1 BTU/hr·ft·°F), better than 86% of refractory metal grades
- Stiff — 320 GPa (46.4 Msi), better than 84% of refractory metal grades
- High electrical conductivity — 28 % IACS, better than 81% of refractory metal grades
Limitations
- Needs corrosion protection — 45/100, worse than 86% of refractory metal grades
- Limited formability — 15/100, worse than 80% of refractory metal grades
- Difficult to weld — 20/100, worse than 79% of refractory metal grades
Mo-0.5Ti-RX properties
Typical room-temperature values for Mo-0.5Ti-RX; 11 are specific to this condition. Other listed values are Mo-0.5Ti reference data and may not represent this condition. Bars are the position among refractory metal grades.
Physical3
Mo-0.5Ti-RX has a density of 10.2 g/cm³ (0.368 lb/in³), heavier than 63% of refractory metal grades. It melts at 2,620°C (4,748 °F).
Mechanical16
Mo-0.5Ti-RX has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 66% of refractory metal grades. Elongation at break is 30% and the elastic modulus is 320 GPa (46.4 Msi).
Thermal6
Mo-0.5Ti-RX is rated for continuous service to 1,600°C (2,912 °F). It conducts heat at 130 W/m·K (75.1 BTU/hr·ft·°F), better than 86% of refractory metal grades. Thermal expansion is 5.3 µm/m·K (2.94 µin/in·°F).
Electrical3
Mo-0.5Ti-RX conducts electricity at 28 % IACS, better than 81% of refractory metal grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 86% of refractory metal grades.
Sustainability4
Producing a kilogram of Mo-0.5Ti-RX takes about 380 MJ of energy and emits 25 kg of CO₂ — less than 78% of refractory metal grades. Typical recycled content is 25%.
Manufacturability7
Mo-0.5Ti-RX's machinability is poor (30/100, better than 54% of refractory metal grades); weldability poor (20/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Mo-0.5Ti-RX
Is Mo-0.5Ti easy to machine?
Use sharp uncoated or fine-grain carbide tooling with high feed and light depth of cut in a rigid setup; avoid edge rubbing, which work-hardens the surface and chips edges. Grinding and EDM both work well.
Can Mo-0.5Ti be welded?
Fusion welds recrystallize to coarse grains with interstitial segregation and fracture brittly at room temperature. Prefer electron-beam or GTAW in an inert chamber with 150–300 °C preheat, or switch to vacuum brazing or mechanical joining.
Can Mo-0.5Ti be formed, bent or molded?
Room-temperature formability is limited: bend and deep-draw warm at 150–400 °C with large bend radii (at least 3t), and do not cold form recrystallized material.
What surface finishes work on Mo-0.5Ti?
Not anodizable; service above 500 °C in air needs a silicide (MoSi2) or aluminide anti-oxidation coating. Electropolishing and HNO3–H2SO4 pickling remove the machining stress layer, and Ni or Au plating is used for vacuum electronic devices.
Mo-0.5Ti 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 |
|---|---|---|
| Timain alloying element, forms dispersed TiC with C | 0.4 – 0.55 | 0.5 |
| Cforms carbides for strengthening | 0.01 – 0.04 | 0.03 |
| O | ≤ 0.03 | — |
| N | ≤ 0 | — |
| Fe | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Ni | ≤ 0.01 | — |
| Mo | balance | — |
Mo-0.5Ti-RX — frequently asked
What is Mo-0.5Ti-RX used for?
Mo-0.5Ti-RX is typically used for high-temperature fasteners, furnace fixtures, hot-work tooling components and electrodes. In short: stronger than pure molybdenum; higher recrystallisation resistance; structural use to 1300 °C.
What is the yield strength of Mo-0.5Ti-RX?
Mo-0.5Ti-RX has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 66% of refractory metal grades. Strength varies by condition: see the 4 listed tempers.
Is Mo-0.5Ti-RX easy to machine?
Not especially — machinability is rated poor (30/100, better than 54% of refractory metal grades). Use sharp uncoated or fine-grain carbide tooling with high feed and light depth of cut in a rigid setup; avoid edge rubbing, which work-hardens the surface and chips edges. Grinding and EDM both work well.
Can Mo-0.5Ti-RX be welded?
Not readily — weldability is rated poor (20/100). Fusion welds recrystallize to coarse grains with interstitial segregation and fracture brittly at room temperature. Prefer electron-beam or GTAW in an inert chamber with 150–300 °C preheat, or switch to vacuum brazing or mechanical joining.
What surface finishes work on Mo-0.5Ti-RX?
Not anodizable; service above 500 °C in air needs a silicide (MoSi2) or aluminide anti-oxidation coating. Electropolishing and HNO3–H2SO4 pickling remove the machining stress layer, and Ni or Au plating is used for vacuum electronic devices.
Can Mo-0.5Ti-RX be formed, bent or molded?
Room-temperature formability is limited: bend and deep-draw warm at 150–400 °C with large bend radii (at least 3t), and do not cold form recrystallized material.
What is the maximum service temperature of Mo-0.5Ti-RX?
Mo-0.5Ti-RX is rated for continuous use to about 1,600°C (2,912 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Mo-0.5Ti-SR and Mo-0.5Ti-CW?
SR is the default condition — pick this as-worked, 900–1200 °C stress-relieved supply state for bar and plate: the retained worked fiber structure gives 620 MPa yield and usable room-temperature toughness for 1000–1400 °C structures and dies. CW: choose for wire, thin rod and sheet supplied heavily swaged or rolled without anneal, where strength peaks near 900 MPa yield; accept 8% elongation and pronounced anisotropy. Yield strength is 620 MPa in SR versus 900 MPa in CW.
Sources
- ASTM B387 — Molybdenum and Molybdenum Alloy Bar, Rod, and Wire (Type 361) — ASTM International (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Refractory Metals) — ASM International (1990)
- Molybdenum alloys (Mo-Ti-Zr / Mo-0.5Ti) material data — Plansee SE (2023)
- Molybdenum and molybdenum alloys technical data — Ed Fagan Inc. / Rembar (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.