Nickel Alloy Alloy 59
UNS N06059 · EN 2.4605, NiCr23Mo16Al · also Hastelloy 59
Alloy 59 (N06059 / 2.4605, NiCr23Mo16Al, Hastelloy 59) is a highly alloyed Ni-Cr-Mo material with high resistance to pitting, crevice corrosion and stress-corrosion cracking in aggressive chloride and acid media (corrosion score 93).
Reference datasheet — Alloy 59 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 SA condition
Alloy 59 tempers and conditions
Alloy 59 is supplied in 5 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot finished then solution annealed | Choose for thick plate, forgings and heavy bar where hot working precedes the anneal; slightly lower strength and coarser grain than thin cold-rolled product. | 340 | 715 | 50 | 190 HB | 1.3 % IACS |
SADefault Solution annealed | Standard supply condition for sheet, plate, bar, pipe and fittings; maximum corrosion resistance and ductility. | 360 | 740 | 50 | 200 HB | — |
Cold rolled and bright annealed sheet/strip | Thin sheet and strip for lining, bellows and formed parts; fine grain, bright surface, best formability and weld appearance. | 380 | 760 | 48 | 210 HB | 1.3 % IACS |
As-welded deposit | Matching filler / weld deposit properties for joint design; used as-welded without post-weld heat treatment in almost all corrosion service. | 460 | 720 | 38 | 215 HB | 1.3 % IACS |
Cold drawn | Use where higher strength and tighter tolerances are needed (fasteners, shafts, instrument tubing); corrosion resistance retained but ductility and formability drop. | 750 | 950 | 22 | 30 HRC | — |
What is Alloy 59?
Alloy 59 (N06059 / 2.4605, NiCr23Mo16Al, Hastelloy 59) is a highly alloyed Ni-Cr-Mo material with high resistance to pitting, crevice corrosion and stress-corrosion cracking in aggressive chloride and acid media (corrosion score 93). Solution-annealed stock reaches 360 MPa yield, 740 MPa tensile strength, 50 % elongation and about 200 HB, with service to 1000 °C, and is available as plate, sheet, tube, bar and clad products. Weldability is good (score 88) but machinability is the lowest in this group (score 18) and material cost is high. Alloy 30 (N06030) is the lower-cost option where phosphoric acid rather than chlorides governs. Alloy 59 has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,310°C (2,390 °F). Alloy 59 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 740 MPa (107 ksi) — weaker than 57% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 210 GPa (30.5 Msi).
What is Alloy 59 used for?
- flue gas desulfurization
- seawater equipment
- chemical process vessels
Advantages
- Polishes to a fine finish — 80/100, better than 97% of nickel alloy grades
- Good corrosion resistance — 93/100, better than 95% of nickel alloy grades
- Readily welded — 88/100, better than 92% of nickel alloy grades
- Ductile — tolerates forming and impact — 50%, better than 88% of nickel alloy grades
- Forms and bends easily — 75/100, better than 82% of nickel alloy grades
Alloy 59 properties
Typical room-temperature values for Alloy 59-SA; bars are the position among nickel alloy grades.
Physical3
Alloy 59 has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,310°C (2,390 °F).
Mechanical15
Alloy 59 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 740 MPa (107 ksi) — weaker than 57% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
Alloy 59 is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 10.4 W/m·K (6.01 BTU/hr·ft·°F), worse than 76% of nickel alloy grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical3
Alloy 59 conducts electricity at 1.3 % IACS, worse than 82% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 95% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 59 takes about 180 MJ of energy and emits 14 kg of CO₂ — more than 69% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability7
Alloy 59's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability excellent (88/100); formability very good (75/100).
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. Alloy 59 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Alloy 59
Is Alloy 59 easy to machine?
Machine like a gummy austenitic superalloy: rigid setup, positive-rake sharp carbide, low speed with heavy feed, generous flood coolant, and never dwell - the alloy work hardens fast and glazes the cut.
Can Alloy 59 be welded?
Readily welded by GTAW/GMAW/PAW autogenously or with matching ERNiCrMo-13 filler, no preheat and no PWHT; keep heat input and interpass temperature low and clean oxides between passes.
Can Alloy 59 be formed, bent or molded?
Very ductile but strongly work hardening - allow extra power/springback in bending and deep drawing, and interstage anneal at ~1100 °C with rapid cooling for severe forming.
Alloy 59 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 | 22 – 24 | 23 |
| Mo | 15 – 16.5 | 16 |
| Aldeoxidiser, improves structural stability | 0.1 – 0.4 | 0.25 |
| Fe | ≤ 1.5 | 0.5 |
| Cvery low C for intergranular corrosion resistance | ≤ 0.01 | 0.01 |
| Si | ≤ 0.1 | 0.03 |
| Mn | ≤ 0.5 | 0.2 |
| Co | ≤ 0.3 | 0.1 |
| Cu | ≤ 0.5 | 0.05 |
| Ti | ≤ 0.1 | |
| P | ≤ 0.02 | |
| S | ≤ 0.01 | |
| Nibalance, typically ≥59 % | ≥ 59 (balance) |
What surface finishes work on Alloy 59?
Pickle and passivate or electropolish after hot working/welding to restore the passive film; not anodizable, takes a bright mechanical polish for hygienic surfaces.
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
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Alloy 59 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06059
- EN / DIN / Werkstoff-Nr.
- 2.4605NiCr23Mo16Al
- Trade names
- Hastelloy 59
How much does Alloy 59 cost?
Alloy 59 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.
Alloy 59 — frequently asked
What is Alloy 59 used for?
Alloy 59 is typically used for flue gas desulfurization, seawater equipment and chemical process vessels. In short: top pitting resistance of family; excellent weldability for Ni-Mo-Cr; hardest of the group to machine.
What is the yield strength of Alloy 59?
Alloy 59 has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 740 MPa (107 ksi) — weaker than 57% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Alloy 59 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% of nickel alloy grades). Machine like a gummy austenitic superalloy: rigid setup, positive-rake sharp carbide, low speed with heavy feed, generous flood coolant, and never dwell - the alloy work hardens fast and glazes the cut.
Can Alloy 59 be welded?
Yes — weldability is rated excellent (88/100). Readily welded by GTAW/GMAW/PAW autogenously or with matching ERNiCrMo-13 filler, no preheat and no PWHT; keep heat input and interpass temperature low and clean oxides between passes.
What surface finishes work on Alloy 59?
Pickle and passivate or electropolish after hot working/welding to restore the passive film; not anodizable, takes a bright mechanical polish for hygienic surfaces.
Can Alloy 59 be formed, bent or molded?
Very ductile but strongly work hardening - allow extra power/springback in bending and deep drawing, and interstage anneal at ~1100 °C with rapid cooling for severe forming.
What is the maximum service temperature of Alloy 59?
Alloy 59 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 Alloy 59-SA and Alloy 59-CD?
SA is the default condition — standard supply condition for sheet, plate, bar, pipe and fittings; maximum corrosion resistance and ductility. CD: use where higher strength and tighter tolerances are needed (fasteners, shafts, instrument tubing); corrosion resistance retained but ductility and formability drop. Yield strength is 360 MPa in SA versus 750 MPa in CD.
How much does Alloy 59 cost?
Alloy 59 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
- ASTM B575 - Ni-Cr-Mo alloy plate, sheet and strip (UNS N06059) — ASTM International (2023)
- ASTM B574 - Ni-Cr-Mo alloy rod and bar — ASTM International (2023)
- ASTM B622 / B619 - seamless and welded Ni-alloy pipe and tube — ASTM International (2022)
- DIN EN 10088 / VdTÜV-Werkstoffblatt for 2.4605 NiCr23Mo16Al — DIN / VdTÜV (2018)
- VDM Alloy 59 (Nicrofer 5923 hMo) material data sheet — VDM Metals (2021)
- ASM Handbook Vol. 2 - Properties of Nonferrous Alloys (Ni-Cr-Mo corrosion alloys) — ASM International (1990)
- GB/T 15007 / GB/T 15062 — (SAC) (2017)
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.