800H
800H alloys are nickel-iron-chromium alloys designed to resist oxidation and carburization at elevated temperatures. The nickel content, 32%, makes the alloys highly resistant both to chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition. This alloy also has superior creep and stress rupture properties.
800H Inventory Size Ranges
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Standard Inventory Specifications
- ASTM B 409
- ASME SB 409
- AMS 5871
Common Trade Names
- ATI 800 (™ Allegheny Technologies)
- ATI 800H (™ Allegheny Technologies)
- ATI 800AT (™ Allegheny Technologies)
Common Applications of 800H
- Heat exchanger
- Dampers
- Pressure vessels
- Reforming components
- Industrial heating
Chemical Composition
| Element | Percent by Weight | |
|---|---|---|
| C | Carbon | 0.08% |
| Mn | Manganese | 1.0% |
| P | Phosphorus | 0.02% |
| S | Sulfur | 0.01% |
| Si | Silicon | 0.35% |
| Cr | Chromium | 21.0% |
| Ni | Nickel | 32.0% |
| Ti | Titanium | 0.40% |
| Al | Aluminum | 0.40% |
| Cu | Copper | 0.30% |
Alloy 600 Physical Properties
- Density: 0.29 lb/in3
- Magnetic Permeability: <1.02
- Specific Heat: 0.12 Btu/lb°F
- Electrical Resistivity: 99 microhm-cm at 70°F (21°C)
Coefficient of Thermal Expansion
| Temperature, °F | 70-200 | 70-1000 | 70-1200 | 70-1400 |
|---|---|---|---|---|
| in/in°F x 10-6 | 7.9 | 9.4 | 9.6 | 9.9 |
Thermal Conductivity
| Temperature, °F | 70 | 70-800 | 70-1800 |
|---|---|---|---|
| Btu-ft/ft2-hr-°F | 6.7 | 10.6 | 17.8 |
100 Hour Still Air Continuous Oxidation Tests
| Temperature, °F | 1700 | 1800 | 1900 | 2000 | 2100 |
|---|---|---|---|---|---|
| Sample Weight Gain (mg/cm2) | 0.77 | 1.8 | 2.09 | 2.1 | 5.06 |
Mechanical Properties and Yield Strength of Alloy 800H
| Temperature, °F | 70 | 1000 | 1200 | 1400 | 1500 |
|---|---|---|---|---|---|
| 0.2% Yield Strength, ksi | 43 | 31.7 | 29 | 22.6 | 14.2 |
| Ultimate Tensile Strength, ksi | 87.7 | 72 | 54 | 32.1 | 24.8 |
| Elongation | 44% | 39% | 56% | 85% | 91% |
*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.