Tuburi din aliaj Hastelloy G Tuburi Hastelloy G
Hastelloy G Alloy is an nickel-chromium-iron-molybdenum alloy developed for rezistență la coroziune in both oxidizing and reduceing media. Hastelloy G Alloy shows good resistance to acizi sulfurici și acizi fosforici. Hastelloy G Alloy may further handle both acid and alkaline solutions.
Application of Hastelloy G Alloy
Hastelloy G Alloy is chosen for many chimic applications, particularly those involving acizi sulfurici și acizi fosforici. 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 acid nitric, wet flue gas desulfurization scrubber environmments and acid fluorhidric. It resists pitting and has exceptional resistance to stress corrosion.
The resistance of Hastelloy G Alloy to the formation of cereale boundary precipitates allows the alloy to be used as sudate condition . In some applications, it’s necessary to solution annealing for optimum rezistență la coroziune after fabrication.
Compoziție chimică of Hastelloy G Alloy
| Element | Min | Max |
| Molibden | 5.5 | 7.5 |
| Crom | 21.0 | 23.5 |
| Fier | 18.0 | 21.0 |
| Tungsten | — | 1.00 |
| Cobalt | — | 2.50 |
| Carbon | — | 0.05 |
| Siliciu | — | 1.00 |
| Mangan | 1.00 | 2.00 |
| Phosphorus | — | 0.04 |
| Sulfur | — | 0.03 |
| Nichel | Rămășițe | Rămășițe |
| Niobium + Tantalum | 1.75 | 2.50 |
| Cupru | 1.50 | 2.50 |
Physical Properties of Hastelloy G Alloy
°F |
Unități britanice |
°C |
Unități metrice |
|
Densitate |
70 |
0.300 lb./in³ |
22 |
8.30 kg/dm³ |
Intervalul de topire |
2300- 2450 |
1260- 1343 |
||
Coeficient mediu de termică Extindere |
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 |
|
Termice Conductivitate |
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
Forma |
Stare |
Test Temp, °F(°C) |
Average Dynamic Modulus of Elasticity,10(6) psi (MPa) |
Plate, 3/8″ thick |
Soluție Heat-treated |
Camera |
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
Forma |
Test Temp °F(°C) |
Alungire in 2″ percent |
Reduction of Area, percent |
||
Sheet, 0.125″ thick and under |
Camera 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 |
Camera 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 |