Nickel Alloy Alloy 890 HIP+SA
Heat-treated state
UNS N08890 · also Incoloy 890
Choose for pressure-boundary or high-integrity pump/valve castings where shrinkage porosity must be closed to raise ductility, fatigue life and NDT acceptance.
Values for the HIP+SA 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 |
HIP+SAThis page 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 |
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 HIP+SA?
Alloy 890 HIP+SA is Alloy 890 heat treated to HIP+SA — choose for pressure-boundary or high-integrity pump/valve castings where shrinkage porosity must be closed to raise ductility, fatigue life and NDT acceptance. Alloy 890 HIP+SA has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 475 MPa (68.9 ksi) — weaker than 94% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi). Alloy 890 HIP+SA 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; HIP+SA is available on request or by drawing note.
Advantages
- Low embodied carbon — 7 kg CO₂/kg, better than 98% of nickel alloy grades
- Easy to machine — 32/100, better than 95% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 76% of nickel alloy grades
Limitations
- Low strength — 205 MPa (29.7 ksi), worse than 94% of nickel alloy grades
- Limited service temperature — 480°C (896 °F), worse than 82% of nickel alloy grades
Alloy 890 HIP+SA properties
Typical room-temperature values for Alloy 890 HIP+SA; 22 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 HIP+SA 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 HIP+SA has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 475 MPa (68.9 ksi) — weaker than 94% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
Alloy 890 HIP+SA is rated for continuous service to 480°C (896 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), better than 65% of nickel alloy grades. Thermal expansion is 15.3 µm/m·K (8.5 µin/in·°F).
Electrical3
Alloy 890 HIP+SA conducts electricity at 1.7 % IACS, better than 76% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 77% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 890 HIP+SA 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 HIP+SA's machinability is poor (32/100, better than 95% of nickel alloy grades); weldability fair (50/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 890 HIP+SA
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 HIP+SA — frequently asked
What is Alloy 890 HIP+SA used for?
Alloy 890 HIP+SA 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 HIP+SA?
Alloy 890 HIP+SA has a typical yield strength of 205 MPa (29.7 ksi) and a tensile strength of 475 MPa (68.9 ksi) — weaker than 94% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Alloy 890 HIP+SA easy to machine?
Not especially — machinability is rated poor (32/100, better than 95% 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 HIP+SA be welded?
With care — weldability is rated fair (50/100). 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 HIP+SA?
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 HIP+SA 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 HIP+SA?
Alloy 890 HIP+SA is rated for continuous use to about 480°C (896 °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.