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Hastelloy G |
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Hastelloy G
Introduction to Hastelloy G
Hastelloy is a registered trademark name of Haynes International, Inc. The Hastelloy trademark is applied as the prefix name of a range of corrosion-resistant nickel based alloys promoted under the term “superalloys” or “high-performance alloys”.
Within corrosion applications, Hastelloy alloys may be chosen as a trade-off between performance, cost and other technical issues like e.g. suitability for welding. Despite the fact that Hastelloy alloys generally show less attractive economy in acids compared Tantaline (Tantaline is recognized as the leading performance/price option), Hastelloy is widely used in a number of industries.
Hastelloy G is an nickel-chromium-iron-molybdenum alloy developed for corrosion resistance in both oxidizing and reduceing media. Hastelloy G shows good resistance to sulfuric and phosphoric acids. Hastelloy G may further handle both acid and alkaline solutions.
Typical Application of Hastelloy G
Hastelloy G is chosen for many chemical applications, particularly those involving sulfuric and phosphoric acids. Hastelloy G is widely used in flue gas desulfurization systems and in other types of pollution control equipment. Hastelloy G is also is used in pulp and paper industry equipment.
Chemical Composition of Hastelloy G
|
Element
|
Min
|
Max
|
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Molybdenum
|
5.5
|
7.5
|
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Chromium
|
21.0
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23.5
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Iron
|
18.0
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21.0
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Tungsten
|
--
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1.00
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Cobalt
|
--
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2.50
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Carbon
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--
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0.05
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Silicon
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--
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1.00
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Manganese
|
1.00
|
2.00
|
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Phosphorus
|
--
|
0.04
|
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Sulfur
|
--
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0.03
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|
Nickel
|
Remainder
|
|
Niobium + Tantalum
|
1.75
|
2.50
|
|
Copper
|
1.50
|
2.50
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Corrosion Properties of Hastelloy G
Hastelloy G is an nickel- based alloy with good resistance to hot sulfuric and phosphoric acids.Hastelloy G withstands the corrosive effects of both oxidizing and reducing agents, and can handle both acid and alkaline solutions. The Hastelloy G alloy has good resistance to mixed acids, fluosilicic acid, sulfate compounds, contaminated nitric acid, wet flue gas desulfurization scrubber environmments and hydrofluoric acid. The pitting and stress-corrosion resistance of Hastelloy G is good. The resistance of Hastelloy G to the formation of grain boundary precipitates allows the alloy to be used in the as welded condition for most applications. In some applications, it may be necessary to solution heat-treat Hastelloy G for optimum corrosion resistance after fabrication.
Physical Properties of Hastelloy G
|
Physical Properties
|
°F
|
British Units
|
°C
|
Metric Units
|
|
Density
|
70
|
0.300 lb./in.(3)
|
22
|
8.30 g/cm(3)
|
|
Melting Range
|
2300-
2450
|
1260-
1343
|
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Mean Coefficient
of Thermal
Expansion
|
70-200
|
7.5 microin./in.-°F
|
21-93
|
13.5 X 10(-6)m/m-K
|
|
70-400
|
7.7 microin./in.-°F
|
21-204
|
13.9 X 10(-6)m/m-K
|
|
70-600
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7.9 microin./in.-°F
|
21-316
|
14.2 X 10(-6)m/m-K
|
|
70-800
|
8.3 microin./in.-°F
|
21-427
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14.9 X 10(-6)m/m-K
|
|
70-1000
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8.7 microin./in.-°F
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21-538
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15.7 X 10(-6)m/m-K
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|
70-1200
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9.1 microin./in.-°F
|
21-649
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16.4 X 10(-6)m/m-K
|
|
Thermal
Conductivity
|
77
|
70 Btu-in/ft²-hr-°F
|
25
|
10.1 W/m-K
|
|
212
|
78 Btu-in/ft²-hr-°F
|
100
|
11.2 W/m-K
|
|
392
|
89 Btu-in/ft²-hr-°F
|
200
|
12.8 W/m-K
|
|
572
|
99 Btu-in/ft²-hr-°F
|
300
|
14.3 W/m-K
|
|
752
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110 Btu-in/ft²-hr-°F
|
400
|
15.9 W/m-K
|
|
932
|
121 Btu-in/ft²-hr-°F
|
500
|
17.4 W/m-K
|
|
1112
|
133 Btu-in/ft²-hr-°F
|
600
|
19.2 W/m-K
|
|
1292
|
144 Btu-in/ft²-hr-°F
|
700
|
20.8 W/m-K
|
|
1472
|
155 Btu-in/ft²-hr-°F
|
800
|
22.3 W/m-K
|
|
1652
|
166 Btu-in/ft²-hr-°F
|
900
|
23.9 W/m-K
|
Dynamic Modulus of Elasticity of Hastelloy G
|
Form
|
Condition
|
Test Temp,
°F(°C)
|
Average Dynamic Modulus of
Elasticity,10(6) psi (MPa)
|
|
Plate, 3/8"
thick
|
Solution
Heat-treated
|
Room
|
27.8 (200)
|
|
400 (204)
|
26.3 (181)
|
|
600 (316)
|
25.3 (174)
|
|
800 (427)
|
24.3 (168)
|
|
1000 (538)
|
23.4 (161)
|
Tensile Data of Hastelloy G
|
Form
|
Test
Temp
°F(°C)
|
Ultimate
Tensile
Strength
ksi (MPa)
|
Yield
Strength at
0.2% offset
ksi (MPa)
|
Elongation
in 2" percent
|
Reduction
of Area,
percent
|
|
Sheet, 0.125"
thick and under
|
Room
400 (204)
600 (316)
800 (427)
1000 (538)
|
102.0 (703)
90.9 (627)
88.0 (607)
85.0 (586)
81.9 (565)
|
46.2 (319)
37.4 (258)
35.8 (247)
33.4 (230)
32.8 (226)
|
61
74
82
84
83
|
52
47
48
47
47
|
|
Plate, 3/8
to 5/8"
thick
|
Room
400 (204)
600 (316)
800 (427)
1000 (538)
|
99.6 (687)
87.9 (606)
84.4 (582)
82.0 (565)
76.3 (526)
|
45.0 (310)
33.9 (234)
29.9 (206)
29.1 (201)
28.1 (194)
|
62
63
68
70
73
|
57
52
52
52
57
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