Nickel Alloy Incoloy 800H FRG-ANN
Heat-treated state
UNS N08810 · EN 1.4958
FRG-ANN = forged and Annealed
Forged pressure components re-solutioned to restore the coarse ASTM 5 grain size required for creep credit.
Values for the FRG-ANN condition
Other Incoloy 800H tempers and conditions
Incoloy 800H is listed in 6 conditions; see the grade overview at Incoloy 800H.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution Annealed | Standard supply condition for ASME code high-temperature pressure parts, furnace tubing and plate. | 220 | 520 | 45 | 140 HB | — |
FRG-ANNThis page Forged and Annealed | Forged pressure components re-solutioned to restore the coarse ASTM 5 grain size required for creep credit. | 230 | 530 | 42 | 145 HB | 1.7 % IACS |
Hot-Finished and Annealed | Heavy plate, forged/hot-rolled bar and hot-finished tube; slightly higher strength than fully re-solutioned thin product. | 240 | 545 | 42 | 150 HB | 1.7 % IACS |
Cold-Drawn and Annealed | Choose for close-tolerance bright bar and small-diameter tubing that still needs code-annealed properties. | 255 | 560 | 42 | 160 HB | 1.7 % IACS |
As-welded deposit | Typical cross-weld properties of fabricated assemblies welded without post-weld solution treatment. | 300 | 540 | 35 | 165 HB | 1.7 % IACS |
Cold worked | Use only where higher room-temperature strength/hardness is needed and long-term high-temperature (creep) service is not required. | 620 | 760 | 15 | 21 HRC | 1.7 % IACS |
What is Incoloy 800H FRG-ANN?
Incoloy 800H FRG-ANN is Incoloy 800H heat treated to FRG-ANN — forged pressure components re-solutioned to restore the coarse ASTM 5 grain size required for creep credit. Incoloy 800H FRG-ANN has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 92% of nickel alloy grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi). Incoloy 800H FRG-ANN has a density of 7.94 g/cm³ (0.287 lb/in³), lighter than 88% of nickel alloy grades. It melts at 1,357°C (2,475 °F). SA is the default condition FabDigit quotes; FRG-ANN is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 99% of nickel alloy grades
- Low embodied carbon — 9 kg CO₂/kg, better than 91% of nickel alloy grades
- High service temperature — 1,100°C (2,012 °F), better than 88% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 80% of nickel alloy grades
Limitations
- Low strength — 230 MPa (33.4 ksi), worse than 92% of nickel alloy grades
Incoloy 800H FRG-ANN properties
Typical room-temperature values for Incoloy 800H FRG-ANN; 22 are specific to this condition. Other listed values are Incoloy 800H reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Incoloy 800H FRG-ANN has a density of 7.94 g/cm³ (0.287 lb/in³), lighter than 88% of nickel alloy grades. It melts at 1,357°C (2,475 °F).
Mechanical15
Incoloy 800H FRG-ANN has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 92% of nickel alloy grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
Incoloy 800H FRG-ANN is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), better than 57% of nickel alloy grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
Incoloy 800H FRG-ANN conducts electricity at 1.7 % IACS, better than 80% 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 Incoloy 800H FRG-ANN takes about 105 MJ of energy and emits 9 kg of CO₂ — less than 94% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability7
Incoloy 800H FRG-ANN's machinability is poor (29/100, better than 85% of nickel alloy grades); weldability very good (80/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Incoloy 800H FRG-ANN
Is Incoloy 800H easy to machine?
Gummy and work-hardening — use rigid setups, positive-rake carbide, low speed (15–30 m/min) with heavy positive feed and copious sulphur-free coolant; never dwell in the cut.
Can Incoloy 800H be welded?
Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 or ENiCrFe-2/-3 filler, low heat input, no preheat, interpass <150 °C; keep sulphur/lead contamination off the joint and re-solution treat if full creep credit is required.
Can Incoloy 800H be formed, bent or molded?
Excellent cold formability at ~2× the force of 304; hot work at 1150–900 °C and finish above 900 °C, then solution anneal at 1120–1180 °C and rapid cool to restore the coarse ASTM 5 grain size.
What surface finishes work on Incoloy 800H?
Pickle in HNO3-HF or grit blast plus passivation to remove green Cr-rich scale; not anodisable — protective service comes from the self-forming Cr2O3/spinel layer.
Incoloy 800H 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 |
|---|---|---|
| Ni | 30 – 35 | 32 |
| Cr | 19 – 23 | 21 |
| Ccontrolled carbon — key difference vs Alloy 800 | 0.05 – 0.1 | 0.08 |
| Al | 0.15 – 0.6 | 0.4 |
| Ti | 0.15 – 0.6 | 0.4 |
| Al+Ticombined limit | 0.3 – 1.2 | 0.8 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 1 | 0.4 |
| Cu | ≤ 0.75 | 0.2 |
| S | ≤ 0.02 | 0 |
| Fe39.5 % min per ASTM B409 | ≥ 39.5 (balance) | — |
Incoloy 800H FRG-ANN — frequently asked
What is Incoloy 800H FRG-ANN used for?
Incoloy 800H FRG-ANN is typically used for reformer/cracker tubes, high-temperature pressure vessels and heat treating fixtures. In short: creep-rated Alloy 800; coarse-grain, controlled carbon; 1100 °C furnace service.
What is the yield strength of Incoloy 800H FRG-ANN?
Incoloy 800H FRG-ANN has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 92% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Incoloy 800H FRG-ANN easy to machine?
Not especially — machinability is rated poor (29/100, better than 85% of nickel alloy grades). Gummy and work-hardening — use rigid setups, positive-rake carbide, low speed (15–30 m/min) with heavy positive feed and copious sulphur-free coolant; never dwell in the cut.
Can Incoloy 800H FRG-ANN be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 or ENiCrFe-2/-3 filler, low heat input, no preheat, interpass <150 °C; keep sulphur/lead contamination off the joint and re-solution treat if full creep credit is required.
What surface finishes work on Incoloy 800H FRG-ANN?
Pickle in HNO3-HF or grit blast plus passivation to remove green Cr-rich scale; not anodisable — protective service comes from the self-forming Cr2O3/spinel layer.
Can Incoloy 800H FRG-ANN be formed, bent or molded?
Excellent cold formability at ~2× the force of 304; hot work at 1150–900 °C and finish above 900 °C, then solution anneal at 1120–1180 °C and rapid cool to restore the coarse ASTM 5 grain size.
What is the maximum service temperature of Incoloy 800H FRG-ANN?
Incoloy 800H FRG-ANN is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Incoloy 800H-SA and Incoloy 800H-CW?
SA is the default condition — standard supply condition for ASME code high-temperature pressure parts, furnace tubing and plate. CW: use only where higher room-temperature strength/hardness is needed and long-term high-temperature (creep) service is not required. Yield strength is 220 MPa in SA versus 620 MPa in CW.
Sources
- ASTM B409 — Ni-Fe-Cr Alloy Plate, Sheet and Strip (UNS N08810) — ASTM International (2021)
- ASTM B407 / B408 / B564 — Ni-Fe-Cr Alloy Seamless Pipe & Tube, Rod & Bar, Forgings — ASTM International (2019)
- ASME BPVC Section II Part D — Allowable stresses, SB-409/SB-407 N08810 — ASME (2023)
- INCOLOY alloys 800H & 800HT — publication SMC-047 — Special Metals Corporation (2004)
- VDM Alloy 800 H / 800 HT material data sheet No. 4029 — VDM Metals (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- EN 10095 / W.Nr. 1.4958 heat-resisting steels and nickel alloys — CEN (1999)
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.