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Incoloy 800 (UNS N08800 / EN 1.4876 / X10NiCrAlTi32-20 / GB NS111) is an iron-nickel-chromium austenitic alloy developed for high-temperature oxidation resistance, carburization resistance, and reliable performance in aqueous corrosive media. It bridges the gap between 300-series stainless steels and higher-cost nickel alloys such as Inconel 600 or Incoloy 825. Below is a complete engineering datasheet of physical, mechanical, and thermal properties for designers, purchasers, and QA/QC personnel sourcing Alloy 800 plate, bar, or seamless tubing.
Chemical Composition (per ASTM B409 / B407 / B408 & EN 10095)
|
Element |
Content (wt.%) |
|---|---|
|
Nickel (Ni) |
30.0 – 35.0 |
|
Chromium (Cr) |
19.0 – 23.0 |
|
Iron (Fe) |
≥ 39.5 (Balance) |
|
Carbon (C) |
≤ 0.10 |
|
Aluminum (Al) |
0.15 – 0.60 |
|
Titanium (Ti) |
0.15 – 0.60 |
|
Manganese (Mn) |
≤ 1.50 |
|
Silicon (Si) |
≤ 1.00 |
|
Copper (Cu) |
≤ 0.75 |
|
Sulfur (S) |
≤ 0.015 |
Al + Ti is typically controlled between 0.30–1.20% to stabilize grain structure during high-temperature exposure.
Physical Properties of Incoloy 800 (1.4876)
|
Property |
Value |
|---|---|
|
Density |
7.94 g/cm³ (commonly rounded to 8.00 g/cm³ for weight calculation) |
|
Melting Range |
1357 – 1385°C (2475 – 2525°F) |
|
Magnetic |
Non-magnetic in solution-annealed condition |
|
Specific Heat (100°C) |
~460 J/(kg·K) |
|
Thermal Conductivity (100°C) |
11.5 – 12.8 W/(m·K) |
|
Coefficient of Thermal Expansion (20–600°C) |
15.4 × 10⁻⁶ /K (avg.) |
|
Electrical Resistivity (20°C) |
~1.22 µΩ·m |
|
Modulus of Elasticity (Room Temp.) |
196 – 200 GPa |
Mechanical Properties – Solution Annealed Condition (Room Temp.)
Typical minimum values per ASTM B409 / B407:
|
Property |
Minimum / Typical Value |
|---|---|
|
Tensile Strength (Rm) |
≥ 520 MPa (75 ksi); typical 550–640 MPa |
|
Yield Strength (Rp0.2) |
≥ 205 MPa (30 ksi); typical 220–275 MPa |
|
Elongation (A₅₀) |
≥ 30%; typical 35–42% |
|
Hardness (Brinell HBW) |
125–180 HB (most stock ≤150 HB) |
|
Hardness (Rockwell HRB) |
70–88 HRB (typical ≤85 HRB) |
|
Impact Toughness (Charpy V-notch, RT) |
> 100 J (typical, fully ductile) |
Cold-worked product forms (drawn tube, cold-rolled strip) will show higher hardness and yield, but are rarely used for high-temperature service.
Temperature Capability & Recommended Service Limits
|
Condition |
Recommended Limit |
|---|---|
|
Max. Continuous Oxidation-Resistant Service (Air) |
~870°C (1600°F); intermittent to ~980–1100°C |
|
Max. Continuous Use for Pressure / Creep Design (800 grade) |
≤ 538–593°C (1000–1100°F) — see note below |
|
Low-Temp. Limit |
Cryogenic to –200°C (no ductile–brittle transition) |
|
For Creep-Governed Pressure Service >593°C |
Specify Incoloy 800H (N08810 / 1.4958) or 800HT (N08811 / 1.4959) |
⚠️ Design Note: ASME Section VIII Div.1 limits pressure design using N08800 to 538°C (1000°F). For creep-based design above 593°C (1100°F), 800H or 800HT must be used. 800 is suitable for non-pressure heat-resisting parts or lower-temperature corrosive-media service.
International Grade Equivalents
|
Standard |
Designation |
|---|---|
|
UNS |
N08800 |
|
EN / DIN |
1.4876 — X10NiCrAlTi32-20 (EN 10095) |
|
GB (China) |
NS111 (also seen as GH1180 / 0Cr20Ni32AlTi in legacy docs) |
|
JIS (Japan) |
NCF 800 (JIS G4901 / G4311) |
|
BS (UK) |
NA 15 |
|
ISO |
ISO 6207 / ISO 9721 series |
