Nickel Alloy Hastelloy G-3
UNS N06985 · EN 2.4619
Hastelloy G-3 (UNS N06985, 2.4619) is a low-carbon, solid-solution Ni-Cr-Mo-Cu corrosion alloy — an improved version of Alloy G with better resistance to sulfuric and phosphoric acid and to reducing chloride environments.
Reference datasheet — Hastelloy G-3 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
Hastelloy G-3 tempers and conditions
Hastelloy G-3 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 + solution annealed | Choose for heavy plate, forgings and seamless pipe where hot working precedes the final anneal; slightly coarser grain and marginally lower strength. | 300 | 670 | 48 | 190 HB | 1.5 % IACS |
SADefault Solution annealed | Standard supply condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility. | 310 | 690 | 50 | 185 HB | — |
Cold rolled + annealed sheet/strip | Thin sheet and strip for lining, bellows and formed scrubber components; fine grain gives slightly higher strength with full ductility. | 325 | 700 | 50 | 192 HB | 1.5 % IACS |
As-welded deposit | Property set for all-weld-metal deposits and weld overlay; low carbon keeps HAZ resistant to intergranular attack without post-weld anneal. | 420 | 660 | 35 | 192 HB | 1.5 % IACS |
Cold drawn | Pick when higher strength and tighter tolerance bar/tube are needed for fasteners, shafts or valve trim; corrosion resistance slightly reduced by residual stress. | 720 | 900 | 20 | 27 HRC | 1.5 % IACS |
What is Hastelloy G-3?
Hastelloy G-3 (UNS N06985, 2.4619) is a low-carbon, solid-solution Ni-Cr-Mo-Cu corrosion alloy — an improved version of Alloy G with better resistance to sulfuric and phosphoric acid and to reducing chloride environments. It is used for acid-plant and scrubber equipment and is available as plate, sheet, welded and seamless pipe, tube and bar, with annealed values near 310 MPa yield, 690 MPa tensile and 50 % elongation. Limits are modest room-temperature strength, poor machinability (score 25) and a maximum service temperature around 650 °C; the low carbon usually allows as-welded service without stabilising heat treatment. Alloy G-30 is the nearest step up for more oxidising acid mixtures. Hastelloy G-3 has a density of 8.31 g/cm³ (0.3 lb/in³), heavier than 51% of nickel alloy grades. It melts at 1,260°C (2,300 °F). Hastelloy G-3 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 74% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 199 GPa (28.9 Msi).
What is Hastelloy G-3 used for?
- phosphoric acid production
- flue gas desulfurization scrubbers
- sulfuric acid coolers
- pickling equipment
Advantages
- Ductile — tolerates forming and impact — 50%, better than 88% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
- Forms and bends easily — 75/100, better than 82% of nickel alloy grades
- Good corrosion resistance — 88/100, better than 81% of nickel alloy grades
Hastelloy G-3 properties
Typical room-temperature values for Hastelloy G-3-SA; bars are the position among nickel alloy grades.
Physical3
Hastelloy G-3 has a density of 8.31 g/cm³ (0.3 lb/in³), heavier than 51% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical14
Hastelloy G-3 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 74% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 199 GPa (28.9 Msi).
Thermal6
Hastelloy G-3 is rated for continuous service to 650°C (1,202 °F). It conducts heat at 10.2 W/m·K (5.89 BTU/hr·ft·°F), worse than 79% of nickel alloy grades. Thermal expansion is 13.5 µm/m·K (7.5 µin/in·°F).
Electrical3
Hastelloy G-3 conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 81% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy G-3 takes about 150 MJ of energy and emits 12 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability7
Hastelloy G-3's machinability is poor (25/100, better than 76% of nickel alloy grades); weldability excellent (85/100); 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. Hastelloy G-3 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy G-3
Is Hastelloy G-3 easy to machine?
Machine like a solid-solution Ni-Cr-Mo alloy: rigid setup, positive-rake sharp carbide, low surface speed (20–35 m/min turning), heavy positive feed to cut under the work-hardened layer, and flood sulfochlorinated coolant.
Can Hastelloy G-3 be welded?
Readily welded by GTAW/GMAW/SMAW with matching ERNiCrMo-9 (AWS A5.14) or ENiCrMo-9 filler; keep interpass below ~150 °C, low heat input and stringer beads; low carbon usually permits use in the as-welded condition.
Can Hastelloy G-3 be formed, bent or molded?
Cold forms well but work-hardens rapidly — allow intermediate solution anneals at 1120–1150 °C with rapid quench; hot work between about 900 and 1180 °C.
Hastelloy G-3 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 | 21 – 23.5 | 22 |
| Fe | 18 – 21 | 19.5 |
| Mo | 6 – 8 | 7 |
| Cu | 1.5 – 2.5 | 2 |
| Co | ≤ 5 | 2 |
| W | ≤ 1.5 | 1 |
| Nb+TaCb+Ta; 8×C minimum stabilization intent | ≤ 0.5 | 0.3 |
| Mn | ≤ 1 | 0.5 |
| Si | ≤ 1 | 0.4 |
| C | ≤ 0.02 | 0.01 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Nibalance, ~44 % nominal | ≥ 42 (balance) |
What surface finishes work on Hastelloy G-3?
Pickle in nitric-hydrofluoric or grind/blast to remove heat tint and embedded iron before service; electropolishing or mechanical polishing gives the best acid-service surface; no anodizing.
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 Hastelloy G-3 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06985
- EN / DIN / Werkstoff-Nr.
- 2.4619
How much does Hastelloy G-3 cost?
Hastelloy G-3 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.
Hastelloy G-3 — frequently asked
What is Hastelloy G-3 used for?
Hastelloy G-3 is typically used for phosphoric acid production, flue gas desulfurization scrubbers, sulfuric acid coolers and pickling equipment. In short: low-carbon Alloy G upgrade; as-welded acid service; handles phosphoric acid.
What is the yield strength of Hastelloy G-3?
Hastelloy G-3 has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 74% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Hastelloy G-3 easy to machine?
Not especially — machinability is rated poor (25/100, better than 76% of nickel alloy grades). Machine like a solid-solution Ni-Cr-Mo alloy: rigid setup, positive-rake sharp carbide, low surface speed (20–35 m/min turning), heavy positive feed to cut under the work-hardened layer, and flood sulfochlorinated coolant.
Can Hastelloy G-3 be welded?
Yes — weldability is rated excellent (85/100). Readily welded by GTAW/GMAW/SMAW with matching ERNiCrMo-9 (AWS A5.14) or ENiCrMo-9 filler; keep interpass below ~150 °C, low heat input and stringer beads; low carbon usually permits use in the as-welded condition.
What surface finishes work on Hastelloy G-3?
Pickle in nitric-hydrofluoric or grind/blast to remove heat tint and embedded iron before service; electropolishing or mechanical polishing gives the best acid-service surface; no anodizing.
Can Hastelloy G-3 be formed, bent or molded?
Cold forms well but work-hardens rapidly — allow intermediate solution anneals at 1120–1150 °C with rapid quench; hot work between about 900 and 1180 °C.
What is the maximum service temperature of Hastelloy G-3?
Hastelloy G-3 is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy G-3-SA and Hastelloy G-3-CD?
SA is the default condition — standard supply condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility. CD: pick when higher strength and tighter tolerance bar/tube are needed for fasteners, shafts or valve trim; corrosion resistance slightly reduced by residual stress. Yield strength is 310 MPa in SA versus 720 MPa in CD.
How much does Hastelloy G-3 cost?
Hastelloy G-3 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 B582 — Nickel-Chromium-Iron-Molybdenum-Copper Alloy Plate, Sheet, and Strip — ASTM International (2019)
- ASTM B581 — Ni-Cr-Fe-Mo-Cu Alloy Rod, Bar and Wire — ASTM International (2019)
- ASTM B622 / B626 — Seamless and Welded Nickel Alloy Pipe and Tube — ASTM International (2019)
- HASTELLOY G-3 alloy technical data (N06985) — Haynes International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
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.