Alloy 800H/AT
UNS N08810, N08811
Description
H/AT
800H/AT is a nickel-iron-chromium alloy designed to resist oxidation and carburization at elevated temperatures through 1900 °F and especially designed for high temperature structural applications. The alloy is an austenitic heat resistant alloy with superior creep and stress rupture properties and excellent corrosion resistance. The superior creep and stress rupture result from close control of the carbon, aluminum, and titanium contents, which is in conjunction with a high-temperature anneal to achieve a grain size of ASTM 5 or coarser. And the nickel content makes the alloys highly resistant both to chloride stress corrosion cracking and to embrittlement from precipitation of sigma phase. 800H/AT is commonly welded using RA82 (ERNiCr-3) bare wire for applications under 1450 °F.
Chemical Component
| Ni | Cr | Al | Al+ Ti | C | Mn | P | S | Si | Cu | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| 30-35% | 19-23% | 0.15-0.6% | 0.85-1.2% | 0.06-0.1% | 1.5% max | 0.045% max | 0.015% max | 1% max | 0.75% max | 39.5% min |
Basic Information
| Items | Alloy 800H/AT |
|---|---|
| Catalog | ACMA-Ni-A006 |
| Density | 7.94 g/cm3 |
| Specific Heat Capacity | 460 J/kg °C (0-100 °C) |
| Curie Temperature | -115 °C |
| Melting Range | 1357-1385 °C |
Material Forms
Alfa Chemistry offers Alloy 800H/AT in a variety of forms, including
- Round Bar
- Sheet & Plate
- Pipe
- Flanges
- Pipe Fittings
Mechanical & Physical Properties
| Properties | 21.1 °C | 537.8 °C | 649 °C | 760 °C | 871 °C | 982 °C |
|---|---|---|---|---|---|---|
| Ultimate Tensile Strength, MPa | 530.9 | 437.8 | 384 | 222.7 | 128.2 | 70.3 |
| 0.2% Yield Strength, MPa | 199.9 | 113.8 | 102 | 99.3 | 80 | 61.4 |
| Elongation, % | 52 | 51 | 50 | 78 | 120 | 120 |
| Minimum Creep 0.0001% per hr | - | - | - | 41.1 | 24.8 | 7.2 |
| 10,000 hr Rupture Strength | - | - | - | 50.3 | 24.1 | 8.3 |
| Coefficient of Thermal Expansion, µm/m°C | - | - | - | 17.8 | 18.4 | - |
| Thermal Conductivity, kcal/(hr.m.°C) | 10 | - | - | 20.5 | 22.5 | 26.5 |
| Modulus of Elasticity, GPa | 1.97 | - | - | 1.45 | 1.32 | - |
Specifications
Feature
- High design stresses for ASME Section VIII applications to 1650 °F
- Useful oxidation resistance through 1800 °F
- Resistant to chloride ion stress corrosion cracking
Applications
Alloy 800H/AT can be used in a variety of applications, including:
- Super-heaters and re-heater tubing
- Reformer outlet pigtails and manifolds
- Heat exchangers
- Nitric acid catalyst supports
- Pressure vessels
- Dampers
- Industrial furnaces
- Reformer outlet pigtails and manifolds
Among the many applications, Alloy 800H/AT is most suitable for petrochemical & Refinery sector.
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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