A Review of Challenges to Hastelloy – C Series Weld Overlay
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Table 9 Hastelloy – C series alloys with major application and characteristics [3]
UNS
Major application
Characteristics
N10276 Alloy C-276 – Chemical and chemical
processing industries
– Expansively in pollution control
application
– Resistance to localized corrosion
and stress corrosion cracking
– Outstanding resistance to mildly
oxidizing environments
– Outstanding resistance to
reducing and environments
– Resistant to localized attack and
SCC
N06455
Alloy C-4
– High-temperature application
(650–1040°C)
– Almost same corrosion
resistance to UNS N10276
N06022
Alloy C-22
– Best used as general weld filler
alloy used to resist weldment
– Superior corrosion resistance in
oxidizing environments
compared to Hastelloy C-276,
Hastelloy C-4, and 625 alloys
N06200
AlloyS C-2000
– Used in a wide range of
applications due to expansive
corrosion resistance in the
oxidizing and reducing
atmosphere
– Compared to Hastelloy C-276
outstanding resistance to
localized corrosion also
outstanding resistance to stress
corrosion cracking
– Among the most extensive
oxidizing and reducing corrosion
resistance in the family
Fig. 2 0.1 mm/year lines in HCl and H 2 SO 4 acid for alloy C-2000, alloy C-22, alloy C-276, alloy
625, super austenitic 254SMo and austenitic stainless steel 316 L [38]