925 alloy is a hardening of the nickel-iron-chromium alloy, both corrosion-resistant and has a high strength. Nickel and copper, titanium, molybdenum and aluminum combine to provide resistance to stress corrosion cracking, crevice, crevice corrosion, oxidation and reduction environments, and are therefore widely used in downhole, surface gas well components, shaft products and fasteners.
chemical component%
| C |
S |
Cr |
Mo |
Ti |
Al |
Mn |
Si |
Ni |
Cu |
Fe |
Nb |
| 0.03 |
0.03 |
19.5-23.5 |
2.5-3.5 |
1.9-2.4 |
0.1-0.5 |
1 |
0.5 |
38-46 |
1.5-3.0 |
22 |
0.5 |
Corrosion resistance
925 alloy in the oxidative environment and reducing the environment can withstand a variety of corrosion, especially for high temperature and high pressure acid gas wells, resistant to 5% NaCl + 0.5% acetic acid + saturated H2S solution environment caused by cracking
Heat treatment
925 alloy common supply status for the solid solution annealing and solid solution + aging state. The solution of the material is heated to 1800-1900 ° F, 30 minutes to 4 hours, and then water quenched. The aging treatment was carried out at 1365 ° F for 8 hours and then cooled to 1150 ° F for 6 hours and then air cooled.
| Temperature |
Btu/lb/°F |
KJ/KG/K |
| 70°F/20°C |
0.104 |
435 |
| 200°F/100°C |
0.109 |
456 |
| 400°F/200°C |
0.116 |
486 |
| 600°F/300°C |
0.122 |
507 |
| 800°F/400°C |
0.129 |
532 |
| 1000°F/500°C |
0.136 |
561 |
| 1200°F/600°C |
0.143 |
586 |
| 1400°F/700°C |
0.15 |
611 |
| 1600°F/800°C |
0.157 |
640 |
Processing performance
Thermal processing
The heat treatment furnace temperature of the 925 alloy is 1600-2150 ° F. For maximum strength and corrosion resistance, the temperature range for hot working is 1600-1800 ° F.
Machine plus
925 alloy solid solution and the aging state has a good machine plus performance. In order to achieve the best finished finish, it can be rough after the solution treatment, and then aging, and then finishing.
Welding
925 alloy can be used tungsten gas shielded welding
Doris
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