hastelloy C276 and Inconel 718
Is Inconel 718 alloy difficult to machine?
The machining of Inconel 718 presents significant challenges due to its toughness and tendency to work harden. Advanced tool materials and coolant technology, as well as a controlled machining environment, are essential to efficiently machine this material.
What is the difference between Hastelloy C276 and Inconel 718 Alloy?
In terms of alloy strength, Inconel 718 is stronger than Hastelloy C276, especially at high temperatures, which makes it more suitable for structural applications. Machinability: Both alloys are easy to weld and form, but Hastelloy C276 may require special welding techniques to maintain its corrosion resistance.
What is the hardness of Inconel 718 alloy?
The hardness in the solution treated condition is approximately 20-25 HRc, which increases to approximately 36-44 HRc after aging. ATI 718 alloy has good oxidation resistance at temperatures up to 1,800°F (982°C). The alloy also has good corrosion resistance to a wide range of corrosive media, including resistance to stress corrosion cracking.
How is Inconel 718 alloy heat treated?
Two heat treatments are commonly used for INCONEL 718 alloy:• Solution annealing at 1700-1850°F followed by rapid cooling (usually in water) and precipitation hardening at 1325°F for 8 hours, followed by furnace cooling to 1150°F, holding at 1150°F for 18 hours, and air cooling.
hastelloy C276 and Inconel 718 Specifications
Chemical Composition of Inconel 718
Typical chemical analysis of Inconel 718.
|
Element
|
Percentage |
| Carbon |
0.08 max |
| Manganese |
0.35 max |
| Phosphorus |
0.015 max |
| Sulfur |
0.015 max |
| Silicon |
0.35 max |
| Chromium |
17-21 |
| Nickel |
50-55 |
| Molybdenum |
2.80-3.30 |
| Columbium |
4.75-5.50 |
| Titanium |
0.65-1.15 |
| Aluminum |
0.20-0.80 |
| Cobalt |
1.00 max |
| Boron |
0.006 max |
| Copper |
0.30 max |
| Tantalum |
0.05 max |
| Iron |
Balance |
Chemical Composition – Hastelloy C276
| Element | Hastelloy C276 |
|---|---|
| Ni | Bal* (50.99 min) |
| Mo | 15.0 – 17.0 |
| Cr | 14.5 – 16.5 |
| Fe | 4.0 – 7.0 |
| W | 3.0 – 4.5 |
| Co | 2.5 |
| C | 0.010 |
| Si | 0.08 |
| Mn | 1.0 |
| V | 0.35 |
| P | 0.04 |
| S | 0.03 |
Physical Properties of Inconel 718
Typical physical properties of Inconel 718 are summarized in the table below.
|
Solution Treated |
Solution Treated and Aged |
|
| Density |
0.296 lb/in3 (8.192 g/cm3) |
0.297 lb/in3 (8.22 g/cm3) |
| Specific Gravity |
8.19 |
8.22 |
| Melting Range |
2500-2600°F |
1370-1430°C |
Physical Properties – Hastelloy C276
| Density | 8.89 g/cm 3 / 0.321 lb/in 3 |
| Melting Point | 1325 -1370 (°C) / 2415 – 2500 (°F) |
| Specific Heat @ 70°F | 0.102 Btu/lb/°F |
| Thermal Conductivity @ 70°F | 67.9 Btu•in/h/ft2/°F |
| Young's Modulus 103ksi | 29.8 |
| Shear Modulus 103ksi | 11.4 |
| Permeability (15.9 kA/m) | 1.0002 (200 oersted) |
| Poisson's Ratio | 0.307 |
| Annealed | 1121 (°C) / 2050 (°F) |
| Quench | Rapid Air/Water |
Conclusion
In conclusion, both Inconel 718 and Hastelloy C276 are excellent alloys with unique properties suitable for different applications. The choice between the two depends on the specific requirements of the application, such as the severity of the corrosive environment, the need for high strength, and the manufacturing requirements.
If you are looking for Inconel 718 and Hastelloy C276 suppliers online, feel free to contact Gnee Steel.
As a leading high temperature alloy supplier in China, Gnee Steel provides customers with high-quality Inconel 718 and Hastelloy C276, Hastelloy C2000, Hastelloy B3 (UNS N10675), Hastelloy D205, Hastelloy G30 (UNS N06030), Hastelloy B2, Hastelloy X alloy, Hastelloy C4 and Hastelloy C22 at very competitive prices.
