Hastelloy G Alloy Tubing Hastello G Pipe

Hastelloy G Alloy is an nickel-chromium-iron-molybdenum alloy developed for corrosion resistance in both oxidizing and reduceing media. Hastelloy G Alloy shows good resistance to sulfuric acids and phosphoric acids. Hastelloy G Alloy may further handle both acid and alkaline solutions. 

Application of Hastelloy G Alloy

Hastelloy G Alloy is chosen for many chemical applications, particularly those involving sulfuric acids and phosphoric acids. Hastelloy G Alloy is widely used in flue gas desulfurization systems and in other types of pollution control equipment. Hastelloy G Alloy is also is used in pulp and paper industry equipment. 

Hastelloy G Alloy Corrosion Resistance

Hastelloy G Alloy is an nickel-based alloy with excellent resistance to hot sulfuric and phosphoric acids. It withstands the corrosive effects of both oxidizing and reducing agents, and can handle both acid and alkaline solutions. The alloy has outstanding resistance to mixed acids, fluosilicic acid, sulfate compounds, contaminated nitric acid, wet flue gas desulfurization scrubber environmments and hydrofluoric acid. It resists pitting and has exceptional resistance to stress corrosion.

The resistance of Hastelloy G Alloy to the formation of grain boundary precipitates allows the alloy to be used as welded condition . In some applications, it’s necessary to solution annealing for optimum corrosion resistance after fabrication.

Hastelloy G Alloy Tubing Hastello G Pipe

Chemical Composition of Hastelloy G Alloy

ElementMinMax
Molybdenum5.57.5
Chromium21.023.5
Iron18.021.0
Tungsten1.00
Cobalt2.50
Carbon0.05
Silicon1.00
Manganese1.002.00
Phosphorus0.04
Sulfur0.03
NickelRemainderRemainder
Niobium + Tantalum1.752.50
Copper1.502.50

Physical Properties of Hastelloy G Alloy

°F
British Units
°C
Metric Units
Density
70
0.300 lb./in³
22
8.30 kg/dm³
Melting Range
2300-
2450
1260-
1343
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
7.9 microin./in.-°F
21-316
14.2 X 10(-6)m/m-K
70-800
8.3 microin./in.-°F
21-427
14.9 X 10(-6)m/m-K
70-1000
8.7 microin./in.-°F
21-538
15.7 X 10(-6)m/m-K
70-1200
9.1 microin./in.-°F
21-649
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
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 Alloy

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)

Hastelloy G Alloy Mechanical Properties

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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