HASTELLOY G TECHNICAL DATA

Type Analysis | Corrosion Resistance | Application | Physical Properties


Type Analysis

Element

Min

Max

Molybdenum

5.5

7.5

Chromium

21.0

23.5

Iron

18.0

21.0

Tungsten

--

1.00

Cobalt

--

2.50

Carbon

--

0.05

Silicon

--

1.00

Manganese

1.00

2.00

Phosphorus

--

0.04

Sulfur

--

0.03

Nickel

Remainder

Columbium + Tatalum

1.75

2.50

Copper

1.50

2.50

Corrosion Resistance

Hastelloy G 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 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 for optimum corrosion resistance after fabrication.

Application

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

Average Physical Properties

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

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

Average Dynamic Modulus of Elasticity

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)

Average Tensile Data

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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