1.4958
/1.4876H
Data sheet material 1.4958 / 1.4876H
X5NiCrAlTi31-20
X10NiCrAlTi32-20
Austenitic high-temperature resistant iron-nickel-chromium alloy
Brief description
The material 1.4876H or 1.4958 or Alloy 800H is an austenitic, high-temperature resistant iron-nickel-chromium alloy with good creep rupture strength at temperatures above 600°C. This material also has good resistance in oxidising, carburising and nitriding atmospheres. This material also has good resistance in oxidising, carburising and nitriding atmospheres and good workability. The material 1.4876H / Alloy 800H hardly differs in chemical analysis from the material 1.4876 / Alloy 800, However, the creep rupture strength of the material 1.4876H / Alloy 800H is significantly increased at temperatures above 600°C by special solution annealing. Accordingly, the solution-annealed variant 1.4876H / Alloy 800H should be used at temperatures above 600°C, and the material 1.4876H / Alloy 800H should be used at temperatures below 600°C. 1.4876 / Alloy 800.
Standards and nomenclature
| EN | |
|---|---|
| DIN | X5NiCrAlTi31-20 / X10NiCrAITi32-20 |
| AISI | Alloy 800H |
| US | N08810 |
| EN | |
|---|---|
| DIN | X5NiCrAlTi31-20 / X10NiCrAITi32-20 |
| AISI | Alloy 800H |
| US | N08810 |
Chemical composition
| Ni (nickel) | 30,0 | 32,0 |
| Cr (chromium) | 26,0 | 28,0 |
| Fe (iron) | Rest | Rest |
| C (carbon) | - | 0,015 |
| Mn (manganese) | - | 2,0 |
| Si (silicon) | - | 0,3 |
| Al (aluminium) | 0,2 | 0,6 |
| Cu (copper) | - | 0,5 |
| P (phosphorus) | - | 0,015 |
| S (sulphur) | - | 0,01 |
| Ti (titanium) | 0,2 | 0,6 |
| (Al + Ti) (Aluminium + Titanium) | - | 0,7 |
-
-
min.
max.
Ni
(nickel)
30,0
32,0
Cr
(chrome)
19,0
21,0
Fe
(iron)
43,0
50,0
C
(carbon)
0,06
0,1
Mn
(Manganese)
0,5
1,0
Si
(Silicon)
0,2
0,6
-
-
min.
max.
Al
(aluminium)
0,2
0,6
Cu
(copper)
-
0,5
P
(phosphorus)
-
0,015
S
(sulphur)
-
0,01
Ti
(Titanium)
0,2
0,6
(Al + Ti)
Aluminium + titanium
-
0,7
General properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | good |
| Weldability | good |
Special properties
Heat-resistant against carburisation and oxidation
Good creep rupture strength at temperatures above 600°C
Metallurgical stability in continuous use at elevated temperatures
Corrosion resistance
Due to its high nickel and chromium content, the material 1.4876H has excellent resistance to oxidation. Furthermore, this material is resistant to carburisation, nitriding and oxidation in sulphur-containing media. Alloy 800H also has excellent resistance to hydrogen embrittlement.
Mechanical properties
Yield strength at 20°C
Rp0,2
N / mm²
≥ 170
Tensile strength at 20°C
Rm
N / mm²
450 - 700
Elongation
at 20°C
A5,65
≥ 30%
Modulus of elasticity
at 20°C
kN / mm²
194
Weldability
The grade alloy 800H is easy to weld using conventional welding processes. These include TIG, TIG hot wire, plasma, manual metal arc, MIG/MAG and submerged arc. The workpiece should be welded in a stress-free, metallically bright and dirt-free condition. Low heat input, targeted heat conduction and rapid heat dissipation are recommended. The line bead technique should be used. The temperature of the intermediate layers should not exceed 120°C. Annealing colours should be removed immediately after welding, i.e. while still warm, using a stainless steel brush.
Machinability
Machining should be carried out in a solution-annealed condition. The material Alloy 800H tends to work harden. Therefore, a low cutting speed and a low feed rate should be selected. The tool should be in constant engagement. A sufficient cutting depth should be selected so that the previously created work-hardened zone can be undercut. To ensure a stable cutting process, heat dissipation should be optimised by using large quantities of suitable, water-based cooling lubricants.
Cold forming
The material 1.4876H can be cold formed very well, but intermediate annealing should be carried out in the case of severe cold forming.
Thermal treatment
| Solution annealing | |
|---|---|
| Hot forming | 1200 - 900°C |
| Cooling down | quickly with water or air |
| Solution annealing | |
|---|---|
| Hot forming | 1200 - 900°C |
| Cooling down | quickly with water or air |
Physical properties
Density
at 20°C
kg/dm³
8,0
Electrical
Resistance at 20°C
(ohm) mm²/m
1,01
Melting range
1350 - 1400°C
Thermal conductivity
at 20°C
W/m K
15
Specific
Heat capacity
at 20°C
J/kg K
500
Markets & Applications
Equipment engineering for high-temperature applications
Chemical and petrochemical industry
Industrial furnace construction
Power plant construction
Hydrogen industry
Frequently asked questions
Important note
TEAM EDELSTAHL operates purely as a trading company without technical staff. Consequently, we are not authorised to provide material consulting services.
The above values and information on the properties and/or usability of the material are purely informative. This information is based on the experience of the manufacturer and TEAM EDELSTAHL. All information is without guarantee. Misprints, errors and changes excepted.
