Alloy 800H / 1.4876
CEO
Alloy 800H is an austenitic, heat resistant nickel-iron-chromium solid solution alloy with controlled levels of carbon, aluminum, titanium, silicon and manganese and controlled content of (Al + Ti).
Material Data Sheet
| Material Designation | 1.4876 |
|---|---|
| Werkstoffnummer | 1.4876 / 1.4958 |
| Alloy | Alloy 800h |
| EN material name | X10NiCrAlTi32-20 |
| UNS | N 08810 |
| ASTM/ASME | ASTM B409, ASME SB409, ASTM A240, ASME SA240 |
| ISO | FeNi32Cr21AlTi-HC |
| VdTÜV Data Sheet | 412, 434 |
Main Fields of Application of 1.4876
- Heat exchanger pipes at high temperatures
- Quench systems
- High temperature areas in power plants
- Refineries (E.g. flares)
- Laboratory Equipment
- Furnace construction
Chemical Composition of 1.4876
| C ≤ % | Si ≤ % | Mn ≤ % | P ≤ % | S ≤ % | Cr % |
|---|---|---|---|---|---|
| 0.01 | 0.1 | 0.50 | 0.025 | 0.015 | 22.0-24.0 |
| Ni % | Al % | Cu ≤ % | Al+Ti ≤ % | Fe |
|---|---|---|---|---|
| 30.0-32.0 | 0.2-0.4 | 0.50 | max 0.7 | rest |
Comparison of the Different Alloy 800 Grades
| - | Alloy 800 | 800L | 800 | 800H | 800ht/hp |
|---|---|---|---|---|---|
| Werkstoffnummer | 1.4558 | 1.4876 | 1.4876/ 1.4958 | 1.4959 | |
| UNS Number | N08880 | N08880 | N08810 | N08811 | |
| Operating Temperature [C°] | <550 | <600 | 600-950 | 700-1000 | |
| Advantages | Corrosion resisting | Corrosion and heat resisting | Heat resisting, resistant to oxidation, carburization, nitration | Heat resisting, resistant to oxidation, carburization, nitration | |
| Heat treatment | Soft annealed (920-980°C) | Soft annealed (920-980°C) | Solution annealed (1150°C) | Solution annealed(1150-1200°C) | |
| Al+Ti content [%] | <=1.0 | <=1.0 | <=0.7 | 0.85-1.2 | |
| C content | <0,025 | 0,04-0,08 | 0,06-0,08 | 0,06-0,10 | |
| Ductility | very good | good | good | less good | |
| VdTÜV | 412 | 412/434 | |||
| DIN | 17459/17460 | ||||
| SEW | 310/ 400 | 310/ 470 | 310 | 310 | |
| Comment | Recommended for temperatures below 600°C | Stocked at Hempel, also usable for <700°C | Below 700 °C (1290 °F), gamma prime (γ´) precipitates combined with loss of ductility. |
Characteristics of 1.4876
- Good creep resistance at temperatures above 600 ° C.
- To avoid a weakening in strength between 500 and 700 ° C the content of Al + Ti is limited to max.0.7%
- Good resistance to oxidizing, reducing and nitriding atmospheres and at varying oxidizing and carburizing conditions
- Metallurgical stability in long-term use at high temperatures
Caution: If temperature 500-700 ° C is passed often during the process, 800h should be preferred. Alloy 800HT may show detrimental phases.
Hot Forming
The material is hot formed within a temperature range of 900 and 1200 ° C and afterwards quenched rapidly in water or air. Hot bending is carried out at 1000 to 1150 ° C.
The annealing takes place at 1200 ° C. Holding time about 60 min. / 100 mm thickness. After hot forming, heat treatment for optimum creep strength is recommended.
Cold Forming
The material has a higher work-hardening rate than austenitic stainless steels. The workpiece should be available in the annealed condition. For strong cold forming intermediate annealing is necessary. For more than 10% deformation, annealing should be performed.
Heat Treatment
The solution annealing is carried out at 1150 ° C. It should be cooled quickly under water. With thicknesses less than about 1.5 mm rapid air cooling can be done.
Mechanical Properties of 1.4876 / 1.4958
The following properties at room and elevated temperatures are in the annealed condition and in accordance with the VdTÜV-Blatt. Varying values may be found in literature (e.g. VdTÜV sheet).
At RT Yield: 170N/mm² Tensile: 450-700N/mm² Creep rupture strength of 100.000h value (included VdTÜV safty value 1,5)
| - | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| - | 800h | 800ht/hp | ||||||
| According to | VdTÜV 412 | VdTÜV 412 | VdTüv 434 | VdTüv 434 | ASME UNS N08810 | ASME UNS N08810 | ASME UNS N08811 | ASME UNS N08811 |
| (Al+ti)% | <=0,7 or 1,0 | <=0,7 or 1,0 | <=0,7 | <=0,7 | <=1,0 | <=1,0 | <=1,2 | <=1,2 |
| t°C | T°F | N/mm² | ksi | N/mm² | ksi | N/mm² | ksi | N/mm² |
| 593 | 1100 | 11,5 | 11,5 | 80 | 11.5 | 89 | ||
| 600 | 1112 | 76 | 11 | 76 | 11 | 76 | 84 | |
| 648 | 1200 | 7 | 7,5 | 7.5 | ||||
| 650 | 1202 | 49 | 7 | 51 | 7.5 | 50 | 56 | |
| 700 | 1292 | 31 | 4.5 | 35 | 5 | 33 | 38 |
Filler Metal (For Welding with Alloy 800H)
The following fillers are recommended:
- FM 82
- Werkstoff-Nr. 2.4806
- SG/UP-NiCr20Nb
- AWS A5.14 ERNiCr-3
- Covered electrode
- Werkstoff-Nr. 2.4648
- EL-NiCr19Nb
- AWS A5.11 ENiCrFe--3 mod.
Delivery Program
Plates in Oberhausen
- Standard format: Super-format 2000X6000mm (We can also cut)
- Thickness: 2,0/3,0/4,0/5,0/6,0/8,0/10/12/15/20/25/30/38,1mm
- Standards: VdTÜV 412 und 434/ ASTM & ASME/ EN 10204 3.1 (3.2 on request)
Services Available:
- Water jet cutting / plasma cutting / shear cutting
- Bars in Oberhausen: Ranges Ø12-120mm
- Other sizes can be produced within a short delivery time.
- Rings and forgings can be manufactured also within a short delivery time.
- Services: Sawing / forging (external)
- Strip in Oberhausen: 2mm Strip
- Services: Slitting (external) / producing welded tube (external)
- Fittings: Fittings/ Flanges and other parts are available within short delivery times (1-6 Weeks)
Material with Similar Field of Application
- Alloy 602ca / 2.4633
- Alloy 600/ 2.4816
- Alloy 601/ 2.4851
Further Literature
- NiDi- Corrosion and Heat-restisting Nickel Alloys by G. Sorell
- NiDi- Practical Guidelines for the Fabrication of High Performance Austenitic Stainless Steels (16001)
- Book: Nickel alloys and high-alloy special stainless steels: Properties - Manufacturing - Application, Ulrich Heubner, Jutta Klöwer , Expert Verlag
