Nickel Alloy Alloy 890-F (As fabricated)
Temper
UNS N08890 · also Incoloy 890
Only for non-corrosive, dimensionally stable duty or as an intermediate state before machining and solution annealing; grain-boundary phases cut ductility and acid resistance.
Values for the F condition
Other Alloy 890 tempers and conditions
Alloy 890 is listed in 4 conditions; see the grade overview at Alloy 890.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed and quenched | Standard ASTM A494 delivery condition: heat ≈1120 °C and water quench to dissolve carbides/silicides for full corrosion resistance and ductility. | 200 | 455 | 40 | 160 HB | — |
Weld repaired and re-solution annealed | Foundry-repaired castings that receive a full re-solution treatment after welding; use where minor upgrading is permitted by the purchase spec. | 200 | 445 | 35 | 165 HB | 1.7 % IACS |
hot isostatically pressed then solution annealed | Choose for pressure-boundary or high-integrity pump/valve castings where shrinkage porosity must be closed to raise ductility, fatigue life and NDT acceptance. | 205 | 475 | 45 | 160 HB | 1.7 % IACS |
FThis page As fabricated | Only for non-corrosive, dimensionally stable duty or as an intermediate state before machining and solution annealing; grain-boundary phases cut ductility and acid resistance. | 215 | 420 | 20 | 9 HRC | 1.6 % IACS |
What is Alloy 890-F?
Alloy 890-F is Alloy 890 in the F temper — only for non-corrosive, dimensionally stable duty or as an intermediate state before machining and solution annealing; grain-boundary phases cut ductility and acid resistance. Alloy 890-F has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 93% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 190 GPa (27.6 Msi). Alloy 890-F has a density of 7.95 g/cm³ (0.287 lb/in³), lighter than 86% of nickel alloy grades. It melts at 1,345°C (2,453 °F). SA is the default condition FabDigit quotes; F is available on request or by drawing note.
Advantages
- Low embodied carbon — 7 kg CO₂/kg, better than 98% of nickel alloy grades
Limitations
- Limited service temperature — 400°C (752 °F), worse than 94% of nickel alloy grades
- Low strength — 215 MPa (31.2 ksi), worse than 93% of nickel alloy grades
- Limited formability — 12/100, worse than 83% of nickel alloy grades
- Needs corrosion protection — 68/100, worse than 82% of nickel alloy grades
- Limited ductility — 20%, worse than 76% of nickel alloy grades
Alloy 890-F properties
Typical room-temperature values for Alloy 890-F; 24 are specific to this condition. Other listed values are Alloy 890 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Alloy 890-F has a density of 7.95 g/cm³ (0.287 lb/in³), lighter than 86% of nickel alloy grades. It melts at 1,345°C (2,453 °F).
Mechanical13
Alloy 890-F has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 93% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
Alloy 890-F is rated for continuous service to 400°C (752 °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 15.3 µm/m·K (8.5 µin/in·°F).
Electrical3
Alloy 890-F conducts electricity at 1.6 % IACS, better than 70% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 82% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 890-F takes about 95 MJ of energy and emits 7 kg of CO₂ — less than 97% of nickel alloy grades. Typical recycled content is 50%.
Manufacturability8
Alloy 890-F's machinability is poor (26/100, better than 80% of nickel alloy grades); weldability fair (35/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 890-F
Is Alloy 890 easy to machine?
Machine like Alloy 20 castings: rigid setup, sharp positive-rake carbide, 20–35 m/min, heavy feeds and flood coolant to beat work hardening and abrasive silicides.
Can Alloy 890 be welded?
GTAW/SMAW with matching high-Si or Alloy 20Cb-3 type filler, low heat input and no preheat; hot cracking is the main risk, and full re-solution anneal restores corrosion resistance.
Can Alloy 890 be formed, bent or molded?
Supplied as sand or investment castings only — provide generous fillets and directional solidification; HIP is recommended for pressure-containing parts.
What surface finishes work on Alloy 890?
Grind, pickle and passivate in nitric/HF or nitric acid after heat treatment to remove scale; no anodizing, electropolishing gives the best acid-service surface.
Alloy 890 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 | ≤ 0.07 | 0.05 |
| Mn | ≤ 1.2 | 0.8 |
| Sihigh Si is the key sulfuric-acid addition | 2.5 – 3.5 | 3 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 18 – 20 | 19 |
| Ni | 22 – 25 | 23.5 |
| Mo | 2.5 – 3 | 2.75 |
| Cu | 1.5 – 2 | 1.75 |
| Febalance, roughly 48–52 % | balance | — |
Alloy 890-F — frequently asked
What is Alloy 890-F used for?
Alloy 890-F is typically used for sulfuric acid pumps, valve bodies and process equipment castings. In short: cast Alloy 20 upgrade; sulfuric acid pump grade; castings only, limited weldability.
What is the yield strength of Alloy 890-F?
Alloy 890-F has a typical yield strength of 215 MPa (31.2 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 93% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Alloy 890-F easy to machine?
Not especially — machinability is rated poor (26/100, better than 80% of nickel alloy grades). Machine like Alloy 20 castings: rigid setup, sharp positive-rake carbide, 20–35 m/min, heavy feeds and flood coolant to beat work hardening and abrasive silicides.
Can Alloy 890-F be welded?
With care — weldability is rated fair (35/100). GTAW/SMAW with matching high-Si or Alloy 20Cb-3 type filler, low heat input and no preheat; hot cracking is the main risk, and full re-solution anneal restores corrosion resistance.
What surface finishes work on Alloy 890-F?
Grind, pickle and passivate in nitric/HF or nitric acid after heat treatment to remove scale; no anodizing, electropolishing gives the best acid-service surface.
Can Alloy 890-F be formed, bent or molded?
Supplied as sand or investment castings only — provide generous fillets and directional solidification; HIP is recommended for pressure-containing parts.
What is the maximum service temperature of Alloy 890-F?
Alloy 890-F is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Alloy 890-SA and Alloy 890-F?
SA is the default condition — standard ASTM A494 delivery condition: heat ≈1120 °C and water quench to dissolve carbides/silicides for full corrosion resistance and ductility. F: only for non-corrosive, dimensionally stable duty or as an intermediate state before machining and solution annealing; grain-boundary phases cut ductility and acid resistance. Yield strength is 200 MPa in SA versus 215 MPa in F.
Sources
- ASTM A494/A494M — Castings, Nickel and Nickel Alloy (grade CN-7MS) — ASTM International (2023)
- ASTM A744/A744M — Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service — ASTM International (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (corrosion-resistant castings) — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (sulfuric acid service) — ASM International (2005)
- Corrosion-resistant pump and valve casting alloy datasheets (CN-7M / CN-7MS class) — Specialty alloy foundries (2022)
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.