Alloy 800HT
1.4876HT – N08811
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Material description
Material 1.4876HT is an austenitic, high-temperature solid solution alloy with the alloying elements aluminium, titanium, silicon and manganese. The total content of aluminium and titanium is additionally restricted. The material has a good creep strength at temperatures of above 600°C.
1.4876HT (Alloy 800HT) is resistant to oxidising, carburising and nitriding atmospheres. The good creep strengths at high temperatures are achieved by means of solution annealing – this annealing process, the increased aluminium and titanium content and the resulting properties distinguish 1.4876HT from the soft-annealed standard variant 1.4876 (Alloy 800).
An overview of the properties of 1.4876HT:
- Metallurgical stability for long-term use (at high temperatures)
- Good creep strength (above 600°C)
- Excellent corrosion resistance
- Good oxidation resistance
- Good resistance to carburising and nitriding atmospheres
Applications
- Chemical and petrochemical industry
- Furnace construction
- Power plant industry
- Hydrogen industry
Chemical composition in %
| ASTM B408/564 | DIN EN 10302 | |
|---|---|---|
| Ni | 30.0 – 35.0 | 30.0 – 34.0 |
| Cr | 19.0 – 23.0 | 19.0 – 22.0 |
| Fe, min. | 39.5 | |
| Mn, max. | 1.5 | 1.50 |
| C | 0.06 – 0.10 | 0.05 – 0.10 |
| Cu, max. | 0.75 | 0.50 |
| Si, max. | 1.0 | 0.70 |
| S, max. | 0.015 | 0.010 |
| Al | 0.15 – 0.60 | 0.25 – 0.65 |
| Ti | 0.15 – 0.60 | 0.25 – 0.65 |
| Al + Ti | 0.85 – 1.20 | |
| P, max. | 0.015 |
Mechanical properties
| solution annealed | Bar | Forging ASTM B408 | ASTM B564 | Bar/forging D ≤ 160 mm |
|---|---|---|
| Rm (MPa) | ≥ 448 | 500 – 750 |
| Rp 0.2 (MPa) | ≥ 170 | ≥ 170 |
| Rp 1.0 (MPa) | ≥ 200 | |
| A (%) | ≥ 30 | l ≥ 35, q/t ≥ 30 |
| Grain size | ≤ 5 |
The specified values are non-binding guide values.