Titanium R56406-HIP (Hot isostatic pressed)
Print state · default condition
UNS R56406 · ASTM F1108 · ISO 5832-3
Standard supply condition for implants and flight hardware: HIP closes casting porosity and roughly doubles fatigue life.
Values for the HIP condition
Other R56406 tempers and conditions
R56406 is listed in 5 conditions; see the grade overview at R56406.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest-cost condition for non-fatigue-critical castings where internal microporosity is acceptable. | 820 | 890 | 9 | 33 HRC | — |
Annealed | Stress-relief/anneal after casting or weld repair when dimensional stability and ductility matter more than fatigue. | 825 | 895 | 11 | 33 HRC | — |
Hot isostatically pressed then annealed/stress relieved | Preferred for large or thin-wall implant castings needing both pore closure and low residual stress before final machining. | 830 | 900 | 12 | 33 HRC | — |
HIPDefaultThis page Hot isostatic pressed | Standard supply condition for implants and flight hardware: HIP closes casting porosity and roughly doubles fatigue life. | 840 | 910 | 11 | 34 HRC | — |
Solution treated and aged | Optional for thin-section castings needing maximum strength; sacrifices ductility and toughness and is rarely used for implants. | 930 | 1,020 | 7 | 38 HRC | — |
What is R56406-HIP?
R56406-HIP is R56406 in the HIP condition — standard supply condition for implants and flight hardware: HIP closes casting porosity and roughly doubles fatigue life. R56406-HIP has a yield strength of 840 MPa (122 ksi) and a tensile strength of 910 MPa (132 ksi) — stronger than 63% of titanium grades. Elongation at break is 11% and the elastic modulus is 110 GPa (16 Msi). R56406-HIP has a density of 4.43 g/cm³ (0.16 lb/in³), lighter than 89% of titanium grades. It melts at 1,604°C (2,919 °F).
Advantages
- Tough — resists crack growth — 92 MPa·√m (83.7 ksi·√in), better than 99% of titanium grades
- Polishes to a fine finish — 80/100, better than 98% of titanium grades
Limitations
- Limited formability — 15/100, worse than 93% of titanium grades
- Low electrical conductivity — 1 % IACS, worse than 89% of titanium grades
- Limited ductility — 11%, worse than 87% of titanium grades
- Poor heat conductor — 6.9 W/m·K (3.99 BTU/hr·ft·°F), worse than 83% of titanium grades
R56406-HIP properties
Typical room-temperature values for R56406-HIP; 12 are specific to this condition. Other listed values are R56406 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
R56406-HIP has a density of 4.43 g/cm³ (0.16 lb/in³), lighter than 89% of titanium grades. It melts at 1,604°C (2,919 °F).
Mechanical16
R56406-HIP has a yield strength of 840 MPa (122 ksi) and a tensile strength of 910 MPa (132 ksi) — stronger than 63% of titanium grades. Elongation at break is 11% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
R56406-HIP is rated for continuous service to 350°C (662 °F). It conducts heat at 6.9 W/m·K (3.99 BTU/hr·ft·°F), worse than 83% of titanium grades. Thermal expansion is 8.7 µm/m·K (4.83 µin/in·°F).
Electrical3
R56406-HIP conducts electricity at 1 % IACS, worse than 89% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 53% of titanium grades.
Sustainability4
Producing a kilogram of R56406-HIP takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 25%.
Manufacturability8
R56406-HIP's machinability is poor (20/100, worse than 68% of titanium grades); weldability very good (70/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with R56406-HIP
Is R56406 easy to machine?
Machine at low surface speed (20–40 m/min carbide) with heavy rigid setups, sharp positive-rake tools and flood coolant; avoid dwell to prevent work hardening and titanium fires from fine chips.
Can R56406 be welded?
GTAW/EBW readily in vacuum or full inert shielding with matching ELI filler; weld repair of castings is allowed by ASTM F1108/AMS 4992 with post-weld stress relief and re-inspection.
Can R56406 be formed, bent or molded?
Vacuum investment casting into rammed-graphite or yttria/zirconia face-coat shells; allow 1.0–1.5 % shrink, generous fillets, and plan for HIP plus chemical milling of the alpha case.
What surface finishes work on R56406?
Remove alpha case by chem-mill or grinding, then bead-blast, passivate per ASTM F86, and optionally Type II colour or hard anodise; electropolishing gives implant-grade surfaces.
R56406 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 |
|---|---|---|
| Al | 5.5 – 6.75 | 6.1 |
| V | 3.5 – 4.5 | 4 |
| Fe | ≤ 0.2 | 0.12 |
| Olow-interstitial control for toughness | ≤ 0.2 | 0.14 |
| C | ≤ 0.1 | 0.03 |
| N | ≤ 0.05 | 0.02 |
| H | ≤ 0.02 | 0.01 |
| Ymax, when specified | ≤ 0.01 | — |
| Other, eachresidual | ≤ 0.1 | — |
| Other, totalresidual | ≤ 0.4 | — |
| Ti | balance | — |
R56406-HIP — frequently asked
What is R56406-HIP used for?
R56406-HIP is typically used for orthopedic implant housings, surgical instrument castings, dental implant components and biomedical device castings. In short: implant-grade cast titanium; highest-strength cast Ti here; ELI chemistry, high toughness.
What is the yield strength of R56406-HIP?
R56406-HIP has a typical yield strength of 840 MPa (122 ksi) and a tensile strength of 910 MPa (132 ksi) — stronger than 63% of titanium grades. Strength varies by condition: see the 5 listed tempers.
Is R56406-HIP easy to machine?
Not especially — machinability is rated poor (20/100, worse than 68% of titanium grades). Machine at low surface speed (20–40 m/min carbide) with heavy rigid setups, sharp positive-rake tools and flood coolant; avoid dwell to prevent work hardening and titanium fires from fine chips.
Can R56406-HIP be welded?
Yes — weldability is rated very good (70/100). GTAW/EBW readily in vacuum or full inert shielding with matching ELI filler; weld repair of castings is allowed by ASTM F1108/AMS 4992 with post-weld stress relief and re-inspection.
What surface finishes work on R56406-HIP?
Remove alpha case by chem-mill or grinding, then bead-blast, passivate per ASTM F86, and optionally Type II colour or hard anodise; electropolishing gives implant-grade surfaces.
Can R56406-HIP be formed, bent or molded?
Vacuum investment casting into rammed-graphite or yttria/zirconia face-coat shells; allow 1.0–1.5 % shrink, generous fillets, and plan for HIP plus chemical milling of the alpha case.
What is the maximum service temperature of R56406-HIP?
R56406-HIP is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between R56406-HIP and R56406-STA?
HIP is the default condition — standard supply condition for implants and flight hardware: HIP closes casting porosity and roughly doubles fatigue life. STA: optional for thin-section castings needing maximum strength; sacrifices ductility and toughness and is rarely used for implants. Yield strength is 840 MPa in HIP versus 930 MPa in STA.
Sources
- ASTM F1108 — Titanium-6Aluminum-4Vanadium Alloy Castings for Surgical Implants (UNS R56406) — ASTM International (2021)
- AMS 4992 — Titanium Alloy Castings, Investment, 6Al-4V, HIP — SAE International (2019)
- ISO 5832-3 — Implants for surgery, metallic materials, Ti-6Al-4V alloy — ISO (2021)
- ASTM F86 — Surface Preparation and Marking of Metallic Surgical Implants — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 19 — Fatigue and Fracture (titanium castings) — ASM International (1996)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- TC4/TC4 ELI (2025)
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.