Comparison between monel Alloy 400 and Hastelloy C276
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Comparison between monel Alloy 400 and Hastelloy C276
Monel 400 (nickel-copper alloy) performs well in marine/seawater, weakly acidic, and low-temperature environments, offering excellent cost-effectiveness, but its high-temperature stability is relatively poor. Hastelloy C276 (nickel-molybdenum-chromium alloy) exhibits significant advantages in extreme chemical, reducing, and high-temperature environments, demonstrating superior resistance to pitting/crevice corrosion, but its cost is higher. The molybdenum in C276 gives it excellent resistance to reducing corrosion, while the copper in Monel 400 performs well under oxidizing conditions at room temperature.
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What is the maximum operating temperature of Monel Alloy 400?
Description: Monel Alloy 400 is a nickel-copper solid solution strengthened alloy. This alloy possesses moderate strength, good weldability, good corrosion resistance, and toughness. Its operating temperature can reach up to 1000°F (538°C).
Chemical composition of monel Alloy 400 and Hastelloy C276
| Ni | Cu | Mo | Cr | W | Fe | Mn | Co | C | Si | Others | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy 400 |
63-70 |
28-34 |
– |
– |
– |
2.5 |
2 |
2 |
0.3 |
0.5 |
0.024 |
| Hastelloy C276 |
Balance |
– |
15-17 |
14.5-16.5 |
3-4.5 |
4-7 |
1 |
2.5 |
0.01 |
0.05 |
0.37 |
Monel Alloy 400 and Hastelloy C276 Mechanical Properties
| Alloy 400 | Hastelloy C276 | |
|---|---|---|
| UTS (MPa) |
600 |
690 |
| 0.2% Proof Strength (MPa) |
415 |
310 |
| Elongation (%) |
20 |
40 |
| Hardness (HRC max %) |
35 |
45 |
| Condition |
Cold worked and stress relieved |
Cold worked and solution annealed |
Corrosion Resistance
Both alloys are well regarded for corrosion resistance but their protection varies in different circumstances. Monel 400's copper content excels in corrosion resistance in oxidising environments at normal temperatures but diminishes at higher temperatures. In contrast, the chromium and molybdenum in Hastelloy C276 provide robust oxidisation resistance even at higher temperatures, along with added protection in reducing atmospheres.
Monel Alloy 400 and Hastelloy C276 Physical Properties
| Alloy 400 | Hastelloy C276 | |
|---|---|---|
| Density (g/cm3) |
8.80 |
8.89 |
| Thermal Conductivity (W/moC) |
22.0 |
9.8 |
| Young's Modulus (GPa) |
179 |
205 |
Key Differences Between Hastelloy C276 and Monel 400
Corrosion Resistance: C276 is suitable for extreme, variable chemical environments; Monel 400 is suitable for marine/seawater environments.
Temperature: Due to its chromium/molybdenum content, C276 is more resistant to high temperatures; Monel 400 performs well at low temperatures but has poorer high-temperature oxidation resistance.
Cost: Monel 400 is generally more economical.
Magnetic Properties: Monel 400 is slightly magnetic; C276 is non-magnetic.
How to Choose
For cost-effective marine applications, cooling water systems, or weakly acidic/weakly alkaline environments (where extreme temperatures are not a primary factor), choose Monel 400.
For applications requiring resistance to strong acids (such as sulfuric acid and hydrochloric acid), wet chlorine environments, or any critical application requiring the highest resistance to pitting and corrosion under harsh conditions, choose Hastelloy C276.
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.