INCOLOY 800H/HT is an austenitic heat-resistant alloy widely used in high temperature pressure-bearing structural parts. The high strength of 800H/HT is mainly due to the addition of carbon, aluminum and titanium elements, and it is annealed at a minimum temperature of 1149 ° C to achieve Grain size ASTM 5 grade or coarser.
For 800 H/HT use below 787°C, use 82 (ER NiCr-3) wire for welding. R A 330-04 (N08334) wire has a matching thermal expansion coefficient and higher strength. If you want to get the maximum mechanical strength , it is best to use wire 617 (ERNiCrCoMo-1) or electrode 117 (ENiCrCoMo-1).
In order to avoid the possible stress relaxation of 800H/HT welded parts above 538ºC and cause grain boundary cracking, it is necessary to carry out post-weld heat treatment at 899ºC, and the holding time is based on the material thickness for one hour per 25mm (at least half an hour/25mm thickness). ), and then air-cooled.
Material Standard UNS American Standard: N08811, N08810 W. Nr./EN European Standard: 1.4958, 1.4959 ASTM: B 409, B 408, B 407 ASME: SB-409, SB-408, SB-407 Code Case 1325
chemical composition, %
chromium nickel manganese silicon aluminum titanium Aluminum + Titanium carbon copper phosphorus sulfur iron
minimum 19.0 30.0 -- -- 0.15 0.15 0.85 0.06 -- -- -- 39.5
maximum 23.0 35.0 1.5 1.0 0.6 0.6 1.2 0.1 0.75 0.045 0.015 --
Physical properties of Incoloy 800H:
density 8.0 g/cm3
melting point 1350-1400 ºC
Minimum mechanical properties of Incoloy 800H alloy at room temperature:
alloy tensile strength Rm N/mm2 Yield Strength RP0.2N/mm2 Elongation A5%
800 500 210 35
800H 450 180 35
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