Nickel Alloy Hastelloy G
UNS N06007, N06920 · EN 2.4618
Hastelloy G (UNS N06007, 2.4618) is a Ni-Cr-Fe-Mo-Cu corrosion alloy developed for hot sulfuric and phosphoric acid service.
Reference datasheet — Hastelloy G 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 ANN condition
Hastelloy G tempers and conditions
Hastelloy G is supplied in 5 conditions, soft to hard. ANN 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 Worked / Hot Finished | Heavy bar, ring and forging sections where hot working is followed by solution anneal; slightly lower strength scatter than cold work. | 300 | 670 | 50 | 175 HB | 1.5 % IACS |
ANNDefault Annealed | Standard stocked condition for plate, sheet, tube and forgings in acid service — best corrosion resistance and ductility. | 310 | 690 | 55 | 180 HB | — |
As-welded deposit | Weld metal / as-welded joint properties for fabricated vessels; solution anneal after welding where sensitization is a concern. | 420 | 680 | 35 | 13 HRC | 1.5 % IACS |
Cold drawn | Choose for straight, close-tolerance bar/tube and higher yield strength fasteners and shafts in acid plant hardware. | 550 | 800 | 30 | 22 HRC | 1.5 % IACS |
Cold worked | Springs, clips and thin strip needing maximum strength; corrosion performance and ductility both reduced versus annealed. | 750 | 950 | 15 | 30 HRC | 1.5 % IACS |
What is Hastelloy G?
Hastelloy G (UNS N06007, 2.4618) is a Ni-Cr-Fe-Mo-Cu corrosion alloy developed for hot sulfuric and phosphoric acid service. Annealed material provides 310 MPa yield, 690 MPa tensile, 55 % elongation and 180 HB (88 HRB), with formability rated 75 and weldability 70 in sheet, plate, pipe and bar for tanks, piping and heat exchangers. Machinability is low (25), and the grade has largely been superseded by the G-3 and G-30 variants, so mill availability is limited; specify G-30 or Alloy 20 for new designs unless matching existing plant. Hastelloy G 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 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 55% and the elastic modulus is 198 GPa (28.7 Msi).
What is Hastelloy G used for?
- phosphoric acid production
- sulfuric acid handling
- chemical process piping
Advantages
- Ductile — tolerates forming and impact — 55%, better than 93% of nickel alloy grades
- Low embodied carbon — 11 kg CO₂/kg, better than 85% of nickel alloy grades
- Forms and bends easily — 75/100, better than 82% of nickel alloy grades
Hastelloy G properties
Typical room-temperature values for Hastelloy G-ANN; bars are the position among nickel alloy grades.
Physical3
Hastelloy G 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).
Mechanical13
Hastelloy G 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 55% and the elastic modulus is 198 GPa (28.7 Msi).
Thermal6
Hastelloy G is rated for continuous service to 550°C (1,022 °F). It conducts heat at 10.1 W/m·K (5.84 BTU/hr·ft·°F), worse than 84% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
Hastelloy G conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 74% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy G takes about 145 MJ of energy and emits 11 kg of CO₂ — less than 77% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability7
Hastelloy G's machinability is poor (25/100, better than 76% of nickel alloy grades); weldability very good (70/100); 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 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy G
Is Hastelloy G easy to machine?
Machine like a gummy austenitic Ni alloy: rigid setups, positive-rake carbide, low speed/heavy feed, flood coolant and no dwelling to avoid work-hardened glaze.
Can Hastelloy G be welded?
GTAW/GMAW/SMAW with matching ERNiCrMo-1 or G-3 filler, stringer beads, low heat input and interpass <100 °C; post-weld solution anneal if the HAZ will see hot acid.
Can Hastelloy G be formed, bent or molded?
Very ductile in the annealed state but work-hardens fast — allow extra press tonnage, generous radii and interstage anneals at ~1100 °C with rapid cooling.
Hastelloy G 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 | ≤ 0.05 | 0.03 |
| Mn | 1 – 2 | 1.5 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Cr | 21 – 23.5 | 22 |
| Fe | 18 – 21 | 19.5 |
| Mo | 5.5 – 7.5 | 6.5 |
| Cuimproves resistance in sulfuric acid | 1.5 – 2.5 | 2 |
| Nb+Tastabilizer against intergranular attack | 1.75 – 2.5 | 2.1 |
| Co | ≤ 2.5 | |
| W | ≤ 1 | |
| Nibalance, approx. 42–46 % | balance |
What surface finishes work on Hastelloy G?
Pickle (HNO₃-HF) or bead-blast to remove weld/heat-tint oxide, then passivate; no anodizing — mechanical polish or electropolish for hygienic/acid 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 Hastelloy G in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06007N06920
- EN / DIN / Werkstoff-Nr.
- 2.4618
How much does Hastelloy G cost?
Hastelloy G 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 — frequently asked
What is Hastelloy G used for?
Hastelloy G is typically used for phosphoric acid production, sulfuric acid handling and chemical process piping. In short: original acid-service Hastelloy; superseded by G-3/G-30; good weldability and formability.
What is the yield strength of Hastelloy G?
Hastelloy G 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 easy to machine?
Not especially — machinability is rated poor (25/100, better than 76% of nickel alloy grades). Machine like a gummy austenitic Ni alloy: rigid setups, positive-rake carbide, low speed/heavy feed, flood coolant and no dwelling to avoid work-hardened glaze.
Can Hastelloy G be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SMAW with matching ERNiCrMo-1 or G-3 filler, stringer beads, low heat input and interpass <100 °C; post-weld solution anneal if the HAZ will see hot acid.
What surface finishes work on Hastelloy G?
Pickle (HNO₃-HF) or bead-blast to remove weld/heat-tint oxide, then passivate; no anodizing — mechanical polish or electropolish for hygienic/acid surfaces.
Can Hastelloy G be formed, bent or molded?
Very ductile in the annealed state but work-hardens fast — allow extra press tonnage, generous radii and interstage anneals at ~1100 °C with rapid cooling.
What is the maximum service temperature of Hastelloy G?
Hastelloy G is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy G-ANN and Hastelloy G-CW?
ANN is the default condition — standard stocked condition for plate, sheet, tube and forgings in acid service — best corrosion resistance and ductility. CW: springs, clips and thin strip needing maximum strength; corrosion performance and ductility both reduced versus annealed. Yield strength is 310 MPa in ANN versus 750 MPa in CW.
How much does Hastelloy G cost?
Hastelloy G 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 (N06007) — ASTM International (2019)
- ASTM B581 — Ni-Cr-Fe-Mo-Cu Alloy Rod (N06007) — ASTM International (2019)
- ASTM B622/B619 — Seamless and Welded Nickel Alloy Pipe and Tube — ASTM International (2020)
- Hastelloy alloy G / G-3 technical data — Haynes International (formerly Cabot Corp.) (1990)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys — ASM International (2000)
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.