Hastelloy C-22

Hastelloy C-22 TECHNICAL DATA

Type:

Element Min Max
Molybdenum 12.5 14.5
Chromium 20.0 22.5
Iron 2.00 6.00
Tungsten 2.50 3.50
Cobalt 2.50
Carbon 0.010
Silicon 0.08
Manganese 0.50
Vanadium 0.35
Phosphorus 0.025
Sulfur 0.010
Nickel Remainder

Corrosion Resistance in the As-Welded Condition

Hastelloy C-22 is a versatile nickel-chromium-molybdenum alloy with better overall corrosion resistance than other Ni-Cr-Mo alloys available today, including hastelloy C-276, C-4, and A625. Alloy C-22 has outstanding resistance to pitting, crevice corrosion and stress-corrosion cracking. It has excellent resistance to oxidizing aqueous media including acids with oxidizing agents, wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions. Hastelloy C-22 has outstanding resistance to both reducing and oxidizing media, and because of its versatility can be used where “upset” conditions are likely to occur or in multipurpose plants.
Hastelloy C-22 has exceptional resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, hot contaminated media (organic and inorganic), chlorine, formic and acetic acids, acetic anhydride, and seawater amd brine solutions.
Hastelloy C-22 resists the formation of grain boundary precipitates in the weld heat affected zone, thus making it suitable for most chemical process applications in the as-welded condition.

Workability

Hastelloy C-22 can be fabricated using the same techniques as are used for alloys C-276 or C-4. It can be welded, forged, hot-upset and impact extruded. Alloy C-22 can also be successfully deep-drawn, spun, press formed or punched, although the alloy tends to work-harden.
Parts which have been hot formed or severely cold formed should be heat treated at 2050 °F and rapid quenched prior to final fabrication or installation.

Specifications

Hastelloy C-22 is covered by ASME . Plate, sheet, strip, bar, tubing, and pipe are covered by ASME specifications SB-574, SB-575, SB-619, SB-622 and SB-626 and by ASTM specifications B-574, B-575, B-619, B-622 and B-626. The UNS number is NO6022.

Applications

Some of the area of present or potential use for alloy C-22 are: Acetic acid/Acetic Anhydride, cellophane manufacturing, chlorine spargers, chlorination systems, circuit board etching equipment, complex acid/chemical mixtures, fans and blowers, galvanizing line equipment, gas scrubber systems, geothermal wells, HF furnaces, incineration systems, nuclear fuel reprocessing, pesticide production, phosphoric acid applications, pickling system components, plate heat exchangers, selective leaching systems, sulfur oxide cooling towers, sulfonation systems, and tubular heat exchangers.

Average Physical Properties

Physical Properties °F British Units °C Metric Units
Density 75 0.314 lb./in.(3) 24 8.69 g/cm(3)
Melting Range 2475-
2550
1357-
1399
Electrical
Resistivity
75 44.8 microhm-in. 24 1.14 microhm-m
212 48.3 microhm-in. 100 1.23 microhm-m
392 48.7 microhm-in. 200 1.24 microhm-m
572 49.3 microhm-in. 300 1.25 microhm-m
752 49.6 microhm-in. 400 1.26 microhm-m
932 49.9 microhm-in. 500 1.27 microhm-m
1112 50.2 microhm-in. 600 1.28 microhm-m
Mean Coefficient
of Thermal
Expansion
75-200 6.9 microin./in.-°F 24-93 12.4 X 10(-6)m/m-K
75-400 6.9 microin./in.-°F 24-204 12.4 X 10(-6)m/m-K
75-600 7.0 microin./in.-°F 24-316 12.6 X 10(-6)m/m-K
75-800 7.4 microin./in.-°F 24-427 13.3 X 10(-6)m/m-K
75-1000 7.7 microin./in.-°F 24-538 13.9 X 10(-6)m/m-K
75-1200 8.1 microin./in.-°F 24-649 14.6 X 10(-6)m/m-K
75-1400 8.5 microin./in.-°F 24-760 15.3 X 10(-6)m/m-K
75-1600 8.8 microin./in.-°F 24-871 15.8 X 10(-6)m/m-K
75-1800 9.0 microin./in.-°F 24-982 16.2 X 10(-6)m/m-K
Thermal
Conductivity
118 70 Btu-in/ft²-hr-°F 48 10.1 W/m-K
212 77 Btu-in/ft²-hr-°F 100 11.1 W/m-K
392 93 Btu-in/ft²-hr-°F 200 13.4 W/m-K
572 108 Btu-in/ft²-hr-°F 300 15.5 W/m-K
752 121 Btu-in/ft²-hr-°F 400 17.5 W/m-K
932 135 Btu-in/ft²-hr-°F 500 19.5 W/m-K
1112 148 Btu-in/ft²-hr-°F 600 21.3 W/m-K
Thermal
Diffusivity
70 0.004 in²/sec 21 2.7 x 10(-6)m²/s
212 0.005 in²/sec 100 3.0 x 10(-6)m²/s
392 0.005 in²/sec 200 3.5 x 10(-6)m²/s
572 0.006 in²/sec 300 3.9 x 10(-6)m²/s
752 0.007 in²/sec 400 4.2 x 10(-6)m²/s
932 0.007 in²/sec 500 4.6 x 10(-6)m²/s
1112 0.007 in²/sec 600 4.8 x 10(-6)m²/s

Average Dynamic Modulus of Elasticity

Form Condition Test Temp,
°F(°C)
Average Dynamic Modulus of
Elasticity,10(6) psi (MPa)
Plate Heat-treated
at 2050 °F
(1121 °C),
Rapid Quenched
Room 29.9 (206)
200 (93) 29.4 (203)
400 (204) 28.5 (196)
600 (316) 27.6 (190)
800 (427) 26.6 (183)
1000 (538) 25.7 (177)
1200 (649) 24.8 (171)
1400 (760) 23.6 (163)
1600 (871) 22.4 (154)
1800 (982) 21.1 (145)

Average Room Temperature Hardness

Form Hardness,
Rockwell
Sheet Rb 93
Plate Rb 95

Average Tensile Data, Solution Heat-Treated

Form Test
Temp.,
°F(°C)
Ultimate
Tensile
Strength
ksi (MPa)
Yield
Strength at
0.2% offset
ksi (MPa)
Elongation
in 2″ percent
Sheet, 0.028-
0.125″ thick
Room
200 (93)
400 (204)
600 (316)
800 (427)
1000 (538)
1200 (649)
1400 (760)
116.3 (802)
109.5 (755)
101.6 (701)
97.7 (674)
95.4 (658)
90.7 (625)
84.6 (583)
76.0 (524)
58.5 (403)
53.8 (371)
43.9 (303)
41.8 (288)
41.0 (283)
39.7 (274)
36.1 (249)
34.5 (238)
57
58
57
62
67
61
65
63
Plate, 1/4-3/4″
thick
Room
200 (93)
400 (204)
600 (316)
800 (427)
1000 (538)
1200 (649)
1400 (760)
113.9 (785)
107.1 (738)
98.1 (676)
94.5 (652)
91.5 (631)
87.5 (603)
83.2 (574)
75.6 (521)
54.1 (373)
48.8 (336)
40.5 (279)
36.3 (250)
34.6 (239)
34.0 (234)
32.1 (221)
31.0 (214)
62
65
66
68
68
67
69
68
Bar, 1/2 to 2″
diameter
Room
200 (93)
400 (204)
600 (316)
800 (427)
1000 (538)
1200 (649)
1400 (760)
111.0 (765)
104.9 (723)
96.2 (663)
91.6 (631)
89.1 (614)
84.3 (581)
79.5 (548)
72.2 (498)
51.9 (358)
45.4 (313)
37.5 (259)
33.8 (233)
30.7 (212)
28.8 (199)
28.3 (195)
29.0 (200)
70
73
74
79
79
80
80
77