HAYNES® 625SQ® alloy
Principal Features
HAYNES® 625SQ® alloy (UNS N06626) is a solid-solution strengthened superalloy. It is a modification of HAYNES 625 alloy developed to enhance resistance to fatigue at temperatures up to approximately 1200°F (649°C). The alloy composition is tightly controlled to very low levels of carbon, silicon, and nitrogen.
Primary melting is by vacuum induction melting, followed by consumable electrode practice using electroslag remelting. During processing, the grain size is controlled to ASTM #5 or finer.
HAYNES® 625SQ® alloy is readily fabricated and welded using practices common to HAYNES® 625 alloy. 625SQ® alloy sheet and strip find application in aerospace, automotive, and chemical process industry bellow, expansion joints, and fabrications where fatigue resistance, strength, and corrosion resistance are required.
*Please contact our technical support team if you have technical questions about this alloy.
Nominal Composition
Weight %
Nickel
62 Balance
Cobalt
1 max.
Iron
5 max.
Chromium
21
Molybdenum
9
Niobium* + Tantalum
3.7
Manganese
0.5 max.
Silicon
0.15 max.
Nitrogen
0.02 max.
Aluminum
0.4 max.
Titanium
0.4 max.
Carbon
0.03 max.
| Weight % | |
| Nickel | 62 Balance |
| Cobalt | 1 max. |
| Iron | 5 max. |
| Chromium | 21 |
| Molybdenum | 9 |
| Niobium* + Tantalum | 3.7 |
| Manganese | 0.5 max. |
| Silicon | 0.15 max. |
| Nitrogen | 0.02 max. |
| Aluminum | 0.4 max. |
| Titanium | 0.4 max. |
| Carbon | 0.03 max. |
*Also known as Columbium
Physical Properties
| Physical Property | British Units | Metric Units | ||
| Density | RT |
0.305lb/in3 |
RT |
8.44 g/cm3 |
| Melting Range | 2350-2460°F | – | 1290-1350ºC | – |
| Thermal Conductivity | 800°F |
109 Btu-in/ft2-hr-°F |
1290-1350°C | 15.3 W/m-°C |
| 1000°F |
121 Btu-in/ft2-hr-°F |
400°C | 18.3 W/m-°C | |
| 1200°F |
132 Btu-in/ft2-hr-°F |
600°C | 19.8 W/m-°C | |
| 1400°F |
144 Btu-in/ft2-hr-°F |
700°C | 21.5 W/m-°C | |
| 1600°F |
158 Btu-in/ft2-hr-°F |
800°C | 23.4 W/m-°C | |
| 1800°F |
175 Btu-in/ft2-hr-°F |
900°C | 25.6 W/m-°C | |
| Mean Coefficient of Thermal Expansion | 70-800°F | 7.7 µin/in-°F | 1000°C | 14.2 µm/m-°C |
| 70-1000°F | 8.0 µin/in-°F | 20-500°C | 14.8 µm/m-°C | |
| 70-1200°F | 8.2 µin/in-°F | 20-600°C | 15.4 µm/m-°C | |
| 70-1400°F | 8.6 µin/in-°F | 20-700°C | 16.1 µm/m-°C | |
| 70-1600°F | 9.2 µin/in-°F | 20-800°C | 16.8 µm/m-°C | |
| 70-1800°F | 9.6 µin/in-°F | 20-900°C | 17.4 µm/m-°C | |
| Electrical Resistivity | 400°F | 52.8 µohm-in | 20-1000°C | 134.0 µohm-cm |
| 800°F | 53.5 µohm-in | 200°C | 135.6 µohm-cm | |
| 1000°F | 54.3 µohm-in | 400°C | 137.9 µohm-cm | |
| 1200°F | 54.3 µohm-in | 600°C | 137.5 µohm-cm | |
| 1400°F | 53.9 µohm-in | 700°C | 136.5 µohm-cm | |
| 1600°F | 53.5 µohm-in | 800°C | 135.6 µohm-cm | |
| 1800°F | 53.1 µohm-in | 900°C | 134.8 µohm-cm | |
| Dynamic Modulus of Elasticity | 70°F |
30.2 x 106 psi |
1000°C | 208 GPa |
| 400ºF |
28.8 x 106 psi |
20°C | 199 GPa | |
| 800°F |
26.7 x 106 psi |
200°C | 186 GPa | |
| 1000°F |
25.6 x 106 psi |
400°C | 171 GPa | |
| 1200°F |
24.3 x 106 psi |
600°C | 163 GPa | |
| 1400°F |
22.8 x 106 psi |
700°C | 153 GPa | |
| 1600°F |
21.2 x 106 psi |
800°C | 142 GPa | |
| 1800°F |
18.7 x 106 psi |
900°C | 126 GPa | |
Tensile Properties
Sheet (AMS 5879)
| Test Temperature | Yield Strength 0.2% Offset | Ultimate Tensile Strength | Elongation | |||
| °F | °C | ksi | MPa | ksi | MPa | % |
| RT | RT | 65.5 | 895 | 129.9 | 452 | 51.7 |
| 600 | 316 | 51.1 | 809 | 117.4 | 353 | 64.1 |
| 800 | 427 | 49.1 | 776 | 112.6 | 339 | 60.9 |
| 1000 | 538 | 49.9 | 776 | 112.5 | 344 | 60.5 |
| 1200 | 649 | 46.9 | 787 | 114.2 | 323 | 81.4 |
| 1300 | 704 | 44.4 | 646 | 93.7 | 306 | 103.9 |
| 1400 | 760 | 46.9 | 497 | 72.1 | 323 | 88.8 |
RT= Room Temperature
Heat Treatment
Sheet and Strip, AMS 5879
1600 °F (871 °C) Minimum/Bright Anneal
Specifications and Codes
Specifications
| HAYNES® 625SQ® alloy (N06626) | |
| Sheet, Plate & Strip | AMS 5879ASME CodeCase 2276 |
| Billet, Rod & Bar | – |
| Coated Electrodes | – |
| Bare Welding Rods & Wire | – |
| Seamless Pipe & Tube | – |
| Welded Pipe & Tube | ASME CodeCase No. 2276P= 43 |
| Fittings | ASME CodeCase No. 2276P= 43 |
| Forgings | – |
| DIN | – |
| Others | – |
Codes
| HAYNES® 625SQ® alloy (N06626) | |||
| ASME | Section l | – | |
| Section lll | Class 1 | – | |
| Class 2 | – | ||
| Class 3 | – | ||
| Section lV | HF-300.2 | – | |
| Section Vlll | Div. 1 |
Code Case 2276800°F (427°C)1 |
|
| Div. 2 | – | ||
| Section Xll | – | ||
| B16.5 | – | ||
| B16.34 | – | ||
| B31.1 | – | ||
| B31.3 | – | ||
1Sheet, fittings, welded pipe/tube
Disclaimer
Haynes International makes all reasonable efforts to ensure the accuracy and correctness of the data displayed on this site but makes no representations or warranties as to the data’s accuracy, correctness or reliability. All data are for general information only and not for providing design advice. Alloy properties disclosed here are based on work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature and, as such, are indicative only of the results of such tests and should not be considered guaranteed maximums or minimums. It is the responsibility of the user to test specific alloys under actual service conditions to determine their suitability for a particular purpose.
For specific concentrations of elements present in a particular product and a discussion of the potential health affects thereof, refer to the Safety Data Sheets supplied by Haynes International, Inc. All trademarks are owned by Haynes International, Inc., unless otherwise indicated.