Designed to match equivalent alloys with good hot
strength coupled with excellent resistance to oxidation
up to about 1100°C. Resistance to sulphidation under
oxidizing conditions is superior to many higher nickel
heat-resistant alloys. Resistance to nitriding and
carburization is satisfactory except under reducing
conditions where higher nickel alloys are superior.
Also satisfactory for dissimilar combinations of
materials with related levels of alloying. However,
control of hot cracking in this high silicon weld metal
is dependent on some ferrite being present during
solidification. Caution is therefore required when
considering dilution by dissimilar materials which could
promote fully austenitic solidification, such as type 310
and other high nickel alloys. Combinations with alloys
stabilized with Ti and especially Nb should be avoided,
due to the possibility of embrittlement by Si-rich
eutectics with these elements.
Applications include **furnaces and furnace parts, high
temperature flues, exhaust and heat recuperator
systems, combustion nozzles**. No preheat required, it is desirable to keep
interpass below 150°C.
Iron based 22%Cr-10%Ni alloy with controlled
additions of C, Si, N and rare earths, predominantly
cerium, with excellent oxidation resistance.