1.4958 / 1.4959
N08810/N08811
Alloy 800H/HT
Alloys 800H (UNS N08810) and 800HT (UNS N08811) are dual-certifiable Nickel-Iron-Chromium materials that resist oxidation, carburization and other high temperature corrosion. The chemical composition of the two alloys are identical to Alloy 800 (UNS N08800), with the exception of the higher level of carbon present in both grades (0.05 – 0.10%) in alloy 800H, and (0.06 – 0.10%) in alloy 800HT. Alloy 800HT also has an addition of up 1.0 % aluminum and titanium. Application : Chemical and Petrochemical Processing — process equipment for the production of ethylene, ethylene dichloride, acetic anhydride, ketene, nitric acid and oxy-alcohol, power generation, thermal processing fixtures.
Mechanical Properties
| Tensile strength: | 531 | N/mm² |
| Yield strength 0,2% : | 200 | ≥ N/mm² |
| Elongation: | 52 | ≥ % |
| Hardness HB30: | 127 | ≤ HB |
Chemical Composition
CARBON
C
0,5-0,1% max
SILICON
Si
0,75% max
MAGNESE
Mn
1,50% max
PHOSPHORUS
P
0,045% max
SULPHUR
S
0,015% max
CHROMIUM
Cr
19,0-23,0% max
NICKEL
Ni
30,0-35,0% max
ALUMINIUM
Al
see below *1
TITANIUM
Ti
see below *2
*1 : 0.15 min. – 0.60 max. (800H) / 0.25 min. – 0.60 max (800HT)
*2 : 0.15 min. – 0.60 max.(800H) / 0.25 min. – 0.60 max.(800HT)
1149°C mini
OTHER High Temperature stainless steels
Click the material number to view the material data sheet.