Titanium IMI 834
IMI 834 is an advanced near-alpha titanium disc alloy used in modern civil jet engines where creep resistance is needed up to about 600 °C.
Reference datasheet — IMI 834 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 STA condition
IMI 834 tempers and conditions
IMI 834 is supplied in 3 conditions, soft to hard. STA is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest supply condition for bar, sheet and machining stock; use when parts will be re-solution treated and aged after forming or machining. | 850 | 960 | 14 | 32 HRC | — |
Β-STA | Fully transformed (Widmanstätten/colony) structure for maximum creep resistance and crack-growth resistance in blades and thick sections; pay with lower ductility and LCF life. | 880 | 990 | 8 | 33 HRC | — |
STADefault Solution treated and aged | Standard disc/forging condition: bimodal structure with ~15 % primary α giving the best balance of strength, LCF life and 600 °C creep. | 910 | 1,030 | 12 | 34 HRC | — |
What is IMI 834?
IMI 834 is an advanced near-alpha titanium disc alloy used in modern civil jet engines where creep resistance is needed up to about 600 °C. Solution-treated and aged material provides 910 MPa yield, 1030 MPa tensile, 12% elongation and 34 HRC, supplied as forged discs, rings and blade stock in STA, BSTA or annealed condition. Machinability is very low (15) because of low thermal conductivity and silicide particles; forming is restricted to closely controlled hot work, and welds are generally avoided in rotating hardware. IMI 829 is the lower-temperature alternative. IMI 834 has a density of 4.55 g/cm³ (0.164 lb/in³), heavier than 84% of titanium grades. It melts at 1,550°C (2,822 °F). IMI 834 has a yield strength of 910 MPa (132 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 84% of titanium grades. Elongation at break is 12% and the elastic modulus is 120 GPa (17.4 Msi).
What is IMI 834 used for?
- Jet engine turbine discs
- Compressor discs
- HP compressor drums and spools
- Blade and blisk forgings
- Engine rings and spacers
- Hot-section shafts
- Rotating seal and spacer hardware
Advantages
- High service temperature — 600°C (1,112 °F), better than 100% of titanium grades
- Stiff — 120 GPa (17.4 Msi), better than 98% of titanium grades
- High strength — 910 MPa (132 ksi), better than 84% of titanium grades
Limitations
- Low fracture toughness — 50 MPa·√m (45.5 ksi·√in), worse than 96% of titanium grades
- Difficult to weld — 40/100, worse than 94% of titanium grades
- Limited formability — 15/100, worse than 93% of titanium grades
- Low electrical conductivity — 1 % IACS, worse than 89% of titanium grades
- Limited ductility — 12%, worse than 78% of titanium grades
IMI 834 properties
Typical room-temperature values for IMI 834-STA; bars are the position among titanium grades.
Physical3
IMI 834 has a density of 4.55 g/cm³ (0.164 lb/in³), heavier than 84% of titanium grades. It melts at 1,550°C (2,822 °F).
Mechanical16
IMI 834 has a yield strength of 910 MPa (132 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 84% of titanium grades. Elongation at break is 12% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
IMI 834 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 7 W/m·K (4.04 BTU/hr·ft·°F), worse than 76% of titanium grades. Thermal expansion is 9.7 µm/m·K (5.39 µin/in·°F).
Electrical3
IMI 834 conducts electricity at 1 % IACS, worse than 89% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), worse than 93% of titanium grades.
Sustainability4
Producing a kilogram of IMI 834 takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 10%.
Manufacturability6
IMI 834's machinability is poor (15/100, worse than 97% of titanium grades); weldability fair (40/100); formability poor (15/100).
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 titanium family
Yield strength against density for every titanium grade FabDigit runs. IMI 834 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with IMI 834
Is IMI 834 easy to machine?
Very difficult: low thermal conductivity plus silicides cause rapid tool wear — use rigid setups, sharp uncoated carbide, 20–40 m/min, heavy flood coolant and positive feed to avoid work hardening and smearing.
Can IMI 834 be welded?
GTAW/plasma/electron-beam weldable with full inert shielding or vacuum, but weld and HAZ lose ductility; a 600–700 °C post-weld stress relief is mandatory and welds are generally avoided in rotating disc hardware.
Can IMI 834 be formed, bent or molded?
Hot work only — isothermal/near-isothermal forging in the α+β field (~950–1010 °C) with tight temperature control, since primary α content and hence creep life depend directly on the final solution temperature.
IMI 834 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 |
|---|---|---|
| Alα stabiliser, main strengthener | 5.5 – 6.1 | 5.8 |
| Sn | 3.5 – 4.5 | 4 |
| Zr | 3 – 4 | 3.5 |
| Nboxidation resistance | 0.5 – 0.9 | 0.7 |
| Moβ stabiliser | 0.25 – 0.75 | 0.5 |
| Sicreep resistance via silicide precipitation | 0.2 – 0.6 | 0.35 |
| Cwidens the heat-treatment window (primary α control) | 0.04 – 0.08 | 0.06 |
| O | ≤ 0.15 | 0.1 |
| Fe | ≤ 0.05 | |
| N | ≤ 0.03 | |
| H | ≤ 0.01 | |
| Ti | balance |
What surface finishes work on IMI 834?
Grind/chem-mill to remove alpha case after hot work; shot peening is standard for LCF life, and blue-etch anodize plus FPI are used for crack detection; no protective anodic coating is expected.
Surface treatments FabDigit runs on titanium parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Thermal Spray
How much does IMI 834 cost?
IMI 834 is a high-cost titanium ($$$$), 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.
IMI 834 — frequently asked
What is IMI 834 used for?
IMI 834 is typically used for jet engine turbine discs, compressor discs, HP compressor drums and spools, blade and blisk forgings, engine rings and spacers and hot-section shafts. In short: highest-temperature near-alpha disc alloy; creep resistance to 600 °C; hardest near-alpha to machine.
What is the yield strength of IMI 834?
IMI 834 has a typical yield strength of 910 MPa (132 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 84% of titanium grades. Strength varies by condition: see the 3 listed tempers.
Is IMI 834 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 97% of titanium grades). Very difficult: low thermal conductivity plus silicides cause rapid tool wear — use rigid setups, sharp uncoated carbide, 20–40 m/min, heavy flood coolant and positive feed to avoid work hardening and smearing.
Can IMI 834 be welded?
With care — weldability is rated fair (40/100). GTAW/plasma/electron-beam weldable with full inert shielding or vacuum, but weld and HAZ lose ductility; a 600–700 °C post-weld stress relief is mandatory and welds are generally avoided in rotating disc hardware.
What surface finishes work on IMI 834?
Grind/chem-mill to remove alpha case after hot work; shot peening is standard for LCF life, and blue-etch anodize plus FPI are used for crack detection; no protective anodic coating is expected.
Can IMI 834 be formed, bent or molded?
Hot work only — isothermal/near-isothermal forging in the α+β field (~950–1010 °C) with tight temperature control, since primary α content and hence creep life depend directly on the final solution temperature.
What is the maximum service temperature of IMI 834?
IMI 834 is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between IMI 834-STA and IMI 834-ANN?
STA is the default condition — standard disc/forging condition: bimodal structure with ~15 % primary α giving the best balance of strength, LCF life and 600 °C creep. ANN: softest supply condition for bar, sheet and machining stock; use when parts will be re-solution treated and aged after forming or machining. Yield strength is 910 MPa in STA versus 850 MPa in ANN.
How much does IMI 834 cost?
IMI 834 is a high-cost titanium ($$$$), 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
- TIMETAL 834 high-temperature near-alpha titanium alloy data sheet — Titanium Metals Corporation (TIMET) (2000)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- CES EduPack titanium alloy eco-property records — Ansys Granta (2023)
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.