The Incoloy 800 series alloys have evolved from 800 to 800H to 800HT, each a product of the previous generation's pursuit of optimal creep and rupture properties for high-temperature applications. These alloys not only maintain excellent strength at high temperatures but also offer exceptional resistance to oxidation, carburization, and other types of high-temperature corrosion. HT PIPE is a incoloy 800 800h 800ht Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!
incoloy 800 800h 800ht Chemical Composition Comparison
| Element | Incoloy 800 (N08800) | Incoloy 800H (N08810) | Incoloy 800HT (N08811) |
|---|---|---|---|
| Nickel (Ni) | 30.0-35.0% | 30.0-35.0% | 30.0-35.0% |
| Chromium (Cr) | 19.0-23.0% | 19.0-23.0% | 19.0-23.0% |
| Iron (Fe) | Balance | Balance | Balance |
| Carbon (C) | ≤0.10% | 0.05-0.10% | 0.06-0.10% |
| Aluminum (Al) | 0.15-0.60% | 0.15-0.60% | 0.25-0.60% |
| Titanium (Ti) | 0.15-0.60% | 0.15-0.60% | 0.25-0.60% |
| Al+Ti (Al+Ti) | ≥0.30% | ≥0.30% | 0.85-1.20% |
| Copper (Cu) | ≤0.75% | ≤0.75% | ≤0.75% |
| Manganese (Mn) | ≤1.50% | ≤1.50% | ≤1.50% |
| Silicon (Si) | ≤1.00% | ≤1.00% | ≤1.00% |
| Sulfur (S) | ≤0.015% | ≤0.015% | ≤0.015% |
| Phosphorus (P) | ≤0.030% | ≤0.030% | ≤0.030% |
incoloy no8800 n08810 n08811 Room Temperature Mechanical Properties Comparison
| Property | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| Tensile Strength (MPa) | ≥450 | ≥450 | ≥500 |
| Yield Strength (MPa) | ≥180 | ≥180 | ≥200 |
| Elongation (%) | ≥30 | ≥30 | ≥30 |
| Hardness (HB) | ≤180 | ≤180 | ≤180 |
| Elastic Modulus (GPa) | 200 | 200 | 200 |
| Density (g/cm³) | 7.94 | 7.94 | 7.94 |
incoloy 800 800h 800ht High-Temperature Tensile Strength (MPa)
| Temperature (°C) | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| 200 | 420 | 430 | 450 |
| 400 | 390 | 400 | 420 |
| 600 | 350 | 380 | 400 |
| 800 | 220 | 250 | 280 |
| 1000 | 100 | 120 | 150 |
alloy 800 800h 800ht Creep Rupture Strength (MPa/10,000 hours)
| Temperature (°C) | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| 600 | 180 | 200 | 220 |
| 700 | 85 | 100 | 120 |
| 800 | 35 | 45 | 55 |
| 900 | 12 | 16 | 20 |
| 1000 | 4 | 6 | 8 |
incoloy n08800 n08810 n08811 Heat Treatment Process Comparison
| Heat Treatment Parameter | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| Solution Treatment Temperature | 1100-1170°C | 1100-1170°C | 1100-1170°C |
| Cooling Method | Water quench or rapid air cool | Water quench or rapid air cool | Water quench or rapid air cool |
| Stabilization Annealing | Optional (850-900°C) | Recommended (850-900°C) | Required (850-900°C) |
| Grain Size Requirement | No special requirement | ASTM 5 or coarser | ASTM 5 or coarser |
Product Forms and Standard Certifications
Incoloy 800 series alloys are available in a variety of sizes including plate, bar, strip, wire, rounds, rings, and ring forgings.
- Bars are supplied as-forged, with a ground or lath finish. Rounds and rings are supplied as-forged, and rings are supplied in the solution state.
- Plate is supplied after solution treatment, alkaline pickling, straightening, and trimming.
- Strip is delivered after cold rolling, solution treatment, and descaling.
- Wire is delivered as solution-pickled coils or straight bars, or as solution-finished straight bars with a fine finish.
In terms of standard certification, corresponding standards and specifications exist for Incoloy 800 (UNS N08800), 800H (UNS N08810), and 800HT (UNS N08811).
Conclusion
- Incoloy 800, as a base grade, offers excellent overall performance and optimal economics, making it suitable for most high-temperature corrosive environments.
- Incoloy 800H significantly improves high-temperature creep performance and rupture strength by controlling carbon content and grain size, making it a significant upgrade to the 800 series.
- Incoloy 800HT offers optimal high-temperature performance and creep resistance through further optimization of aluminum and titanium content and strict chemical composition control, making it particularly suitable for use in extreme high-temperature environments.
