Nickel Alloy Haynes 230-AC (Spheroidize annealed)
Heat-treated state
UNS N06230 · EN 2.4733, NiCr22W14Mo
Cast burner nozzles, grid and fixture parts where a complex shape beats wrought fabrication; coarse dendritic structure gives lower ductility than wrought.
Values for the AC condition
Other Haynes 230 tempers and conditions
Haynes 230 is listed in 8 conditions; see the grade overview at Haynes 230.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ACThis page Spheroidize annealed | Cast burner nozzles, grid and fixture parts where a complex shape beats wrought fabrication; coarse dendritic structure gives lower ductility than wrought. | 345 | 620 | 12 | 210 HB | — |
Cast + HIP + solution annealed | Preferred cast condition for pressure-containing or cyclic-load parts: HIP closes microporosity and the solution anneal homogenizes carbides. | 350 | 700 | 22 | 14 HRC | 1.4 % IACS |
As cast | Investment- or sand-cast N06230 with coarse dendritic structure; lower ductility and strength than wrought product but retains the alloy's oxidation and creep resistance. | 355 | 660 | 20 | 205 HB | 9 W/m·K |
SADefault Solution annealed sheet/plate | Standard stocked condition for sheet, strip and plate — best balance of strength, ductility and high-temperature stability. | 390 | 870 | 48 | 195 HB | — |
Wrought (mill-annealed sheet, plate, bar, tube) | Standard wrought Ni-22Cr-14W-2Mo-La solution-annealed mill product with balanced high-temperature strength, oxidation resistance to ~1150 °C and good fabricability. | 390 | 860 | 48 | 200 HB | 1.4 % IACS |
Cold drawn + solution annealed tube, pipe and small bar | Seamless tubing and precision bar with bright annealed finish for furnace/heat-exchanger service. | 395 | 860 | 46 | 17 HRC | 1.4 % IACS |
As-welded deposit | Property set for all-weld-metal joints made with matching 230-W wire; no post-weld heat treatment normally required. | 460 | 810 | 30 | 18 HRC | 1.4 % IACS |
Cold worked | Use where high room-temperature strength or spring action is needed; ductility and long-term high-T stability are reduced (recrystallizes above ~900 °C). | 1,000 | 1,200 | 6 | 35 HRC | 1.4 % IACS |
What is Haynes 230-AC?
Haynes 230-AC is Haynes 230 heat treated to AC — cast burner nozzles, grid and fixture parts where a complex shape beats wrought fabrication; coarse dendritic structure gives lower ductility than wrought. Haynes 230-AC has a yield strength of 345 MPa (50 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 62% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 211 GPa (30.6 Msi). Haynes 230-AC has a density of 8.97 g/cm³ (0.324 lb/in³), heavier than 93% of nickel alloy grades. It melts at 1,301°C (2,374 °F). SA is the default condition FabDigit quotes; AC is available on request or by drawing note.
Advantages
- High service temperature — 1,120°C (2,048 °F), better than 92% of nickel alloy grades
Limitations
- Poor heat conductor — 8.9 W/m·K (5.14 BTU/hr·ft·°F), worse than 98% of nickel alloy grades
- High embodied carbon — 15 kg CO₂/kg, worse than 87% of nickel alloy grades
- Limited ductility — 12%, worse than 83% of nickel alloy grades
Haynes 230-AC properties
Typical room-temperature values for Haynes 230-AC; 10 are specific to this condition. Other listed values are Haynes 230 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Haynes 230-AC has a density of 8.97 g/cm³ (0.324 lb/in³), heavier than 93% of nickel alloy grades. It melts at 1,301°C (2,374 °F).
Mechanical14
Haynes 230-AC has a yield strength of 345 MPa (50 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 62% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 211 GPa (30.6 Msi).
Thermal6
Haynes 230-AC is rated for continuous service to 1,120°C (2,048 °F). It conducts heat at 8.9 W/m·K (5.14 BTU/hr·ft·°F), worse than 98% of nickel alloy grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
Haynes 230-AC conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), worse than 59% of nickel alloy grades.
Sustainability4
Producing a kilogram of Haynes 230-AC takes about 230 MJ of energy and emits 15 kg of CO₂ — more than 91% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
Haynes 230-AC's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability good (65/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Haynes 230-AC
Is Haynes 230 easy to machine?
Machine like a work-hardening Ni-base superalloy: rigid setups, positive-rake sharp carbide or ceramic tooling, low speed / heavy positive feed, flood coolant, and never dwell or rub.
Can Haynes 230 be welded?
Readily joined by GTAW/GMAW/PAW/RSW with matching 230-W filler; keep interpass temperature low and heat input moderate, no PWHT needed for most wrought sections.
Can Haynes 230 be formed, bent or molded?
Good cold formability in the annealed condition but forming loads are ~50 % above austenitic stainless; hot work 950–1200 °C and re-solution anneal at 1177–1246 °C with rapid cool after heavy cold work.
What surface finishes work on Haynes 230?
Pickle/grit-blast to remove oxide before service or coating; not anodizable — aluminide or MCrAlY diffusion coatings are used for extreme oxidation/hot-corrosion duty, and the alloy polishes to a bright finish.
Haynes 230 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 |
|---|---|---|
| Cr | 20 – 24 | 22 |
| W | 13 – 15 | 14 |
| Mo | 1 – 3 | 2 |
| Fe | ≤ 3 | 1 |
| Co | ≤ 5 | 0.3 |
| Mn | 0.3 – 1 | 0.5 |
| Si | 0.25 – 0.75 | 0.4 |
| Al | 0.2 – 0.5 | 0.3 |
| C | 0.05 – 0.15 | 0.1 |
| La | 0.01 – 0.05 | 0.02 |
| Ti | ≤ 0.1 | — |
| Cu | ≤ 0.5 | — |
| B | ≤ 0.02 | 0.01 |
| P | ≤ 0.03 | — |
| S | ≤ 0.02 | — |
| Nibalance, nominally ~57 %; Co+Fe counted as impurities | balance | — |
Haynes 230-AC — frequently asked
What is Haynes 230-AC used for?
Haynes 230-AC is typically used for gas turbine combustor liners, industrial furnace hardware, chemical processing components and aerospace afterburners. In short: strongest solid-solution Ni-Cr grade; fabricable to 1150 °C; combustor-liner standard.
What is the yield strength of Haynes 230-AC?
Haynes 230-AC has a typical yield strength of 345 MPa (50 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 62% of nickel alloy grades. Strength varies by condition: see the 8 listed tempers.
Is Haynes 230-AC easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machine like a work-hardening Ni-base superalloy: rigid setups, positive-rake sharp carbide or ceramic tooling, low speed / heavy positive feed, flood coolant, and never dwell or rub.
Can Haynes 230-AC be welded?
Yes — weldability is rated good (65/100). Readily joined by GTAW/GMAW/PAW/RSW with matching 230-W filler; keep interpass temperature low and heat input moderate, no PWHT needed for most wrought sections.
What surface finishes work on Haynes 230-AC?
Pickle/grit-blast to remove oxide before service or coating; not anodizable — aluminide or MCrAlY diffusion coatings are used for extreme oxidation/hot-corrosion duty, and the alloy polishes to a bright finish.
Can Haynes 230-AC be formed, bent or molded?
Good cold formability in the annealed condition but forming loads are ~50 % above austenitic stainless; hot work 950–1200 °C and re-solution anneal at 1177–1246 °C with rapid cool after heavy cold work.
What is the maximum service temperature of Haynes 230-AC?
Haynes 230-AC is rated for continuous use to about 1,120°C (2,048 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Haynes 230-SA and Haynes 230-CW?
SA is the default condition — standard stocked condition for sheet, strip and plate — best balance of strength, ductility and high-temperature stability. CW: use where high room-temperature strength or spring action is needed; ductility and long-term high-T stability are reduced (recrystallizes above ~900 °C). Yield strength is 390 MPa in SA versus 1,000 MPa in CW.
Sources
- HAYNES 230 alloy brochure (H-3000) — Haynes International (2020)
- ASTM B435 / B564 / B572 / B622 — UNS N06230 plate, sheet, forgings, rod and tube — ASTM International (2019)
- AMS 5878 / AMS 5891 — Nickel alloy 57Ni-22Cr-14W-2Mo-La — SAE International (2017)
- ASM Specialty Handbook: Heat-Resistant Materials / ASM Handbook Vol.1 — ASM International (1997)
- DIN EN 10302 / W.-Nr. 2.4733 NiCr22W14Mo — DIN/CEN (2008)
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.