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Alloy C22 is an improved nickel-chromium-molybdenum-tungsten alloy designed for use in aggressive industrial environments. This alloy offers excellent resistance to pitting and crevice corrosion in oxidizing and acid chloride environments, and is practically immune to chloride stress corrosion cracking (SCC). Hastelloy C22 demonstrates superior weldability and is commonly used as weld filler material for joining other corrosion-resistant alloys.
Material Composition
Alloy 22 is nickel-base and typically contains 22% chromium, 14% molybdenum, and 3% tungsten. Iron content is normally limited to less than 3%. The high chromium content provides excellent resistance to oxidizing media, while molybdenum and tungsten content ensures resistance to reducing media.
Key Advantages
Superior overall corrosion resistance compared to Alloy C-276
Outstanding resistance to chloride pitting, crevice corrosion, and stress corrosion cracking
Excellent performance in oxidizing aqueous environments including wet chlorine and mixtures containing nitric acid with chloride ions
Excellent resistance to corrosive attack by seawater under both stagnant and flowing conditions
Chemical Composition (Hastelloy C22, UNS N06220)
Element
Ni
Cr
Mo
Mn
Si
C
S
P
Cu
V
W
Fe
MIN
--
20.0
12.5
--
--
--
--
--
--
--
2.5
--
MAX
balance
22.5
14.5
0.5
0.08
0.015
0.02
0.02
2.5
0.35
3.5
6.0
Mechanical Properties
Temperature (°F)
70
200
400
600
800
1000
1200
1400
Ultimate Tensile Strength (ksi)
114
107
98
95
92
88
83
76
0.2% Yield Strength (ksi)
54
49
41
36
35
34
32
31
Elongation (%)
62
65
66
68
68
67
69
68
Hardness MAX (HRB)
95
--
--
--
--
--
--
--
Fabrication Properties
Although ductile enough for cold working, intermediate annealing may be necessary due to work hardening. Forging should be performed between 1750-2050°F followed by rapid cooling. Annealing can be performed at 2020-2150°F followed by rapid quench to avoid formation of detrimental phases. Welding can be accomplished using gas tungsten-arc, gas metal-arc, and shielded metal-arc processes.
Industry Standards
Product Form
ASTM Specification
Pipe Seamless
B622
Pipe Welded
B619
Tube Seamless
B622
Tube Welded
B626
Sheet/Plate
B575
Bar
B574
Forging
B564
Fitting
B366
Industrial Applications
Pharmaceutical industries for fittings and tubing to prevent contamination from corrosion-related failures
Cellophane manufacturing processes
Chlorination systems
Pesticide production facilities
Incineration scrubber systems
Chemical process industry equipment including flue gas scrubbers, sulfur dioxide scrubbers, pulp and paper bleach plants, pickling systems, and nuclear fuel reprocessing
Waste water processing systems
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...
