What are the differences between C276 alloy and 400 alloy?
What are the differences between C276 alloy and 400 alloy?
C276 alloy (Hastelloy) (nickel-molybdenum-chromium) exhibits excellent corrosion resistance in corrosive high-temperature environments with strong reducing/oxidizing acids, while 400 alloy (Monel) (nickel-copper) performs well in milder marine and high-purity waters, utilizing its copper content to enhance corrosion resistance, but its performance degrades at higher temperatures. C276, on the other hand, benefits from the chromium and molybdenum, making it more versatile and providing higher strength under extreme conditions.
What are the properties of C276 alloy?
Hastelloy C-276 has the following main properties: excellent corrosion resistance in a variety of corrosive media, including sulfides and chloride ions; and excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking.
What is Alloy C276?
Hastelloy C-276 (UNS N10276) was the first forged nickel-chromium-molybdenum alloy. Its extremely low carbon and silicon content effectively alleviated welding challenges. Therefore, it is widely used in the chemical and related industries and boasts a 50-year track record of excellent performance in numerous corrosive chemical environments.
Key characteristics of Alloy C276:
Excellent performance in chloride-containing environments
Weldable without post-weld heat treatment
What is Alloy 400?
Alloy 400, also known as Monel 400, is a nickel-copper alloy renowned for its excellent resistance to seawater and hydrofluoric acid corrosion. It is one of the earliest developed nickel alloys and remains widely used in the marine and chemical industries.
Key properties of Alloy 400:
Excellent mechanical properties at sub-zero temperatures
Chemical composition of Hastelloy C276 and Monel 400
| W | C | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy 400 |
63-70 |
28-34 |
– |
– |
– |
2.5 |
2 |
2 |
0.3 |
0.5 |
0.024 |
| Hastelloy C276 |
– |
15-17 |
14.5-16.5 |
3-4.5 |
4-7 |
1 |
2.5 |
0.01 |
0.05 |
0.37 |
Comparison of corrosion resistance between Hastelloy C276 and Monel 400
Hastelloy C276:
Excellent performance in oxidizing and reducing agents.
Excellent performance in chlorides, acids, and oxidizing agents.
Suitable for wet chlorine, ferric chloride/copper chloride, hypochlorites, and strong organic acids.
Monel 400:
Excellent performance in marine environments, brine, and alkaline conditions.
Good resistance to hydrofluoric acid, sulfuric acid, and non-oxidizing environments.
Not suitable for oxidizing agents such as nitric acid.
Use Alloy C276 in chemical processing involving corrosive media; use Alloy 400 in marine, oil and gas, and alkaline environments.
Mechanical properties of Hastelloy C276 and Monel 400
| Alloy C276 | Alloy 400 | |
|---|---|---|
| 690 min | 550-620 | |
| 283 min | 170-345 | |
| >=40 | 35-40 | |
| <=241 | ~130-180 | |
| 1325-1370 | 1300-1350 |
Alloy C276 has higher strength and hardness, making it more suitable for demanding structural applications under stress conditions.
Applications of Hastelloy C-276 and Monel 400 alloys
It can be seen that Hastelloy C-276 has a wider range of applications than Monel 400. Furthermore, Hastelloy can also be used in various applications of Monel 400. This is consistent with our previous analysis.
Hastelloy C-276 and Monel 400 main standards
Hastelloy C-276 exhibits superior high-temperature resistance, corrosion resistance, and strength compared to Monel 400. However, Monel 400 is more affordable. Therefore, it is more cost-effective in applications where Monel 400 is suitable. But for high-temperature environments, Hastelloy C-276 should be chosen.
We offer highly cost-effective Monel 400 and Hastelloy C-276 materials. Please feel free to contact us with any needs.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Fast delivery within 7-15 days, supported by global logistics partners
Moisture-proof packaging
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
