Nickel Alloy DZ22
DZ22 is a directionally solidified nickel-base superalloy cast with columnar grains aligned to the blade stacking axis, giving creep and thermal-fatigue resistance along that axis.
Reference datasheet — DZ22 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 DS-AC condition
DZ22 tempers and conditions
DZ22 is supplied in 3 conditions, soft to hard. DS-AC 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 |
|---|---|---|---|---|---|---|
DS-ACDefault directionally solidified, as-cast (no heat treatment) | Use as the standard delivery state for directionally solidified precision castings run as-cast or only coating-diffused, balancing longitudinal creep strength to 1000 °C against process cost. | 850 | 980 | 7 | 40 HRC | 1.4 % IACS |
+ / | Choose when a ~1080 °C diffusion/ageing treatment (often merged with coating diffusion) is used to even out γ′ size for slightly better mid-temperature strength and stability, at 6 % elongation. | 880 | 1,010 | 6 | 42 HRC | 1.4 % IACS |
directionally solidified + HIP + heat treatment | Pick for blades needing the highest fatigue and creep life: hot isostatic pressing after directional solidification removes microporosity, raising elongation to 10 % and tightening HCF scatter. | 890 | 1,040 | 10 | 41 HRC | 1.4 % IACS |
Supply forms, finishes and certifications
Ways DZ22 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
MA | mill annealed / hot worked and annealed (air cooled) | Surface finish |
What is DZ22?
DZ22 is a directionally solidified nickel-base superalloy cast with columnar grains aligned to the blade stacking axis, giving creep and thermal-fatigue resistance along that axis. It provides 850 MPa yield, 980 MPa tensile, 7% elongation and 40 HRC with service to 1000 °C, the highest limit among the cast grades in this group. Casting demands controlled thermal gradient and withdrawal rate, and the alloy cannot be forged, is difficult to weld and has a machinability rating of 8. Equiaxed K403 or K417G is used where DS processing is not justified. DZ22 has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,290°C (2,354 °F). DZ22 has a yield strength of 850 MPa (123 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 89% of nickel alloy grades. Elongation at break is 7% and the elastic modulus is 130 GPa (18.9 Msi).
What is DZ22 used for?
- directionally solidified turbine blades
- aero-engine hot-section components
- industrial gas turbine blades
Advantages
- High strength — 850 MPa (123 ksi), better than 89% of nickel alloy grades
- High service temperature — 1,000°C (1,832 °F), better than 79% of nickel alloy grades
Limitations
- Low stiffness — 130 GPa (18.9 Msi), worse than 99% of nickel alloy grades
- Limited formability — 3/100, worse than 97% of nickel alloy grades
- Difficult to machine — 8/100, worse than 96% of nickel alloy grades
- High embodied carbon — 17 kg CO₂/kg, worse than 96% of nickel alloy grades
- Difficult to weld — 12/100, worse than 90% of nickel alloy grades
DZ22 properties
Typical room-temperature values for DZ22-DS-AC; bars are the position among nickel alloy grades.
Physical3
DZ22 has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,290°C (2,354 °F).
Mechanical15
DZ22 has a yield strength of 850 MPa (123 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 89% of nickel alloy grades. Elongation at break is 7% and the elastic modulus is 130 GPa (18.9 Msi).
Thermal5
DZ22 is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 10 W/m·K (5.78 BTU/hr·ft·°F), worse than 88% of nickel alloy grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
DZ22 conducts electricity at 1.4 % IACS, worse than 78% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 87% of nickel alloy grades.
Sustainability4
Producing a kilogram of DZ22 takes about 250 MJ of energy and emits 17 kg of CO₂ — more than 97% of nickel alloy grades. Typical recycled content is 20%.
Manufacturability8
DZ22's machinability is not recommended (8/100, worse than 96% of nickel alloy grades); weldability not recommended (12/100); formability not recommended (3/100).
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 nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. DZ22 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with DZ22
Is DZ22 easy to machine?
Conventional cutting is barely feasible; airfoil surfaces are produced by precision casting, while roots and cooling holes are finished by creep-feed grinding, ECM and EDM or laser drilling.
Can DZ22 be welded?
Weldability is poor, as high Al+Ti causes solidification and strain-age cracking. Repairs are usually made by vacuum brazing or by laser cladding with preheat followed by heat treatment.
Can DZ22 be formed, bent or molded?
Formed only by directional solidification (HRS or LMC) vacuum precision casting, with strict control of seed/grain selector, thermal gradient and withdrawal rate to avoid stray grains and freckles. No forging or cold forming.
DZ22 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 |
|---|---|---|
| C | 0.11 – 0.18 | 0.14 |
| Cr | 8 – 10 | 9 |
| Co | 9 – 11 | 10 |
| Wmain solid-solution strengthening element | 11.5 – 13 | 12 |
| Algamma-prime forming element | 4.7 – 5.5 | 5 |
| Ti | 1.7 – 2.3 | 2 |
| Nb | 0.8 – 1.3 | 1 |
| Hfimproves transverse ductility, limits casting hot cracking | 1.2 – 1.8 | 1.5 |
| Bgrain boundary strengthening | 0.01 – 0.02 | 0.02 |
| Zr | 0.03 – 0.08 | 0.05 |
| Feimpurity limit | ≤ 0.5 | |
| Simpurity limit | ≤ 0.01 | |
| Ni | balance |
What surface finishes work on DZ22?
After shot peening or abrasive flow machining and chemical cleaning, parts receive aluminide or MCrAlY coatings plus YSZ thermal-barrier layers. Anodizing does not apply.
Surface treatments FabDigit runs on nickel alloy 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).
Plating
Thermal Spray
How much does DZ22 cost?
DZ22 is a high-cost nickel alloy ($$$$), 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.
DZ22 — frequently asked
What is DZ22 used for?
DZ22 is typically used for directionally solidified turbine blades, aero-engine hot-section components and industrial gas turbine blades. In short: directionally solidified blade alloy; 1000 °C service capability; highest creep life here.
What is the yield strength of DZ22?
DZ22 has a typical yield strength of 850 MPa (123 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 89% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is DZ22 easy to machine?
Not especially — machinability is rated not recommended (8/100, worse than 96% of nickel alloy grades). Conventional cutting is barely feasible; airfoil surfaces are produced by precision casting, while roots and cooling holes are finished by creep-feed grinding, ECM and EDM or laser drilling.
Can DZ22 be welded?
Not readily — weldability is rated not recommended (12/100). Weldability is poor, as high Al+Ti causes solidification and strain-age cracking. Repairs are usually made by vacuum brazing or by laser cladding with preheat followed by heat treatment.
What surface finishes work on DZ22?
After shot peening or abrasive flow machining and chemical cleaning, parts receive aluminide or MCrAlY coatings plus YSZ thermal-barrier layers. Anodizing does not apply.
Can DZ22 be formed, bent or molded?
Formed only by directional solidification (HRS or LMC) vacuum precision casting, with strict control of seed/grain selector, thermal gradient and withdrawal rate to avoid stray grains and freckles. No forging or cold forming.
What is the maximum service temperature of DZ22?
DZ22 is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between DZ22 DS-AC and DZ22 DS-HT?
DS-AC is the default condition — use as the standard delivery state for directionally solidified precision castings run as-cast or only coating-diffused, balancing longitudinal creep strength to 1000 °C against process cost. DS-HT: choose when a ~1080 °C diffusion/ageing treatment (often merged with coating diffusion) is used to even out γ′ size for slightly better mid-temperature strength and stability, at 6 % elongation. Yield strength is 850 MPa in DS-AC versus 880 MPa in DS-HT.
How much does DZ22 cost?
DZ22 is a high-cost nickel alloy ($$$$), 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
- Superalloys II / ASM Specialty Handbook: Heat-Resistant Materials (MAR-M200+Hf ) — ASM International (1997)
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.