Monel and Hastelloy are both corrosion resistant alloys, The difference is that corrosion resistance properties in Monel comes from copper material whereas in Hastelloy its comes from chromium and molybdenum. But Monel can resist corrosion at room temperature only but Hastelloy is known for its high corrosion and high temperature resistance properties.
Monel vs Hastelloy Price
Hastelloy is more costlier than a Monel due to its chemical composition and higher processing precison and cost. This price difference is mainly due to their raw materials as Hastelloy grades contains molybdenum and tungsten which are expensive materials.
Hastelloy is more corrosion resistant then Monel Grades
What is Monel?
Monel grades mainly contains Nickel and Copper materials. These are known are their excellent corrosion resistance properties in Seawater. Monel grades have resistance to high temperatures, good mechanical strength and fatigue resistance. They are widely used in Marine and Chemical industries.
What is Hastelloy?
Hastelloy is Nickel based material. They are known for their excellent corrosion resistance properties which enhanced with molybdenum and chromium. High molybdenum content in it increases its workability. Hastelloy Material is exceptional choice for high temperature conditions.
Monel has high strength and toughness
Is Monel Better Than Hastelloy?
No, Monel is a copper and nickel alloy and is excellent at resisting corrosion. But it is not as good as hastelloy in harsh conditions. Hastelloy can be used in different chemicals, acids and high temperatures condition.
How To Choose Between Monel and Hastelloy?
You need to consider different conditions when choosing between Monel and Hastelloy. Monel can be used in wide range of temperature condition but hastelloy is better suited for high temperatured condition. Hastelloy can be used in wide range of media such as acids and harsh chemicals due to their corrosion resistance properties but Monel is widely used in seawater and hydrofluoric acid.
Hastelloy grades have higher heat resistance than Monel
Difference Between Monel and Hastelloy
| Property | Monel | Hastelloy |
|---|---|---|
| Density | 8.80 g/cm³ | 8.89 g/cm³ |
| Corrosion Resistance | Excellent | Excellent |
| Melting Point | 1,300–1,350 °C | 1,323–1,371 °C |
| Magnetism | Non-magnetic | Non-magnetic |
| Tensile Strength | 550–1,100 MPa | 690–783 Mpa |
Different Grades of Monel and Hastelloy
| Monel | Hastelloy |
|---|---|
| Monel 400 Monel K500 |
Hastelloy C22 Hastelloy C276 Hastelloy B2 Hastelloy B3 |
Is Monel Suitable for Shipbuilding?
Yes, It is suitable for shipbuilding. Monel alloys are highly corrosion resistant to seawaters. These material is particularly used in parts of ships which are exposed to seawaters such as pumps, propeller shafts, and fasteners.
Monel contains upto 30% copper while Hastelloy contains upto 20% chromium
Chemical composition of Monel Vs Hastelloy Grades
Monel
| ALLOY | Cu | Ni | Mn | Al | Fe | Ti | Si |
|---|---|---|---|---|---|---|---|
| Monel 400 | 28-34 | 63 min | 2.0 max | 2.5 max | 0.5 max | ||
| Monel K500 | 27-33 | 63 min | 1.5 max | 2.3-3.15 | 2.0 max | 0.35-0.85 | 0.5 max |
| Monel 405 | 28-34 | 63 min | 2.0 max | 2.5 max | 0.5 max |
Hastelloy
| Material(%) | Cr | Ni | V | Co | Fe | Mo | Si | Mn | P | S | W |
|---|---|---|---|---|---|---|---|---|---|---|---|
| C276 | 15.5 | 57 | 0.35 | 2.5 | 5.5 | 16 | 0.08 | 1 | 0.025 | 0.01 | 4 |
| C22 | 22 | 56 | 0.35 | 2.5 | 3 | 13 | 0.08 | 0.5 | 0.01 | 0.02 | 3 |
Monel 400 is less expensive than Hastelloy C276
Monel 400 Vs Hastelloy C276
| Property | Monel 400 | Hastelloy C-276 |
|---|---|---|
| Density, g/cm³ | 8.8 | 8.89 |
| Melting Range, °F | 2370-2460 | 2415-2500 |
| Corrosion Resistance | Better | Excellent |
| Chemical composition | Nickel, Copper | Nickel, Chromium, Molybdenum |
| Price | Low | High |
Machinability of Monel Vs Hastelloy
| Alloy | Machinability |
|---|---|
| Monel 400 (UNS N04400) | Fair |
| Monel K500 (UNS N05500) | Fair to Difficult (Aged) |
| Monel R405 (UNS N04405) | Good (for a Monel) |
| Hastelloy C22 (UNS N06022) | Difficult |
| Hastelloy C276 (UNS N10276) | Difficult |
| Hastelloy X (UNS N06002) | Fair to Difficult |
| Hastelloy B3 (UNS N10675) | Difficult |
Corrosion Resistance of Monel and Hastelloy
| Alloy | Corrosion Resistance to different media |
|---|---|
| Monel 400 (UNS N04400) | Seawater, HF acid, de-aerated H2SO4, alkalies. |
| Monel K500 (UNS N05500) | Good in sour gas. |
| Monel R405 (UNS N04405) | Seawater, HF acid |
| Hastelloy C276 (UNS N10276) | Strong acids (HCl, H2SO4, HNO3), chlorides |
| Hastelloy C22 (UNS N06022) | Highly oxidizing acids, mixed acids, wet chlorine gas. |
| Hastelloy B3 (UNS N10675) | HCl, H2SO4, acetic, phosphoric acids |
| Hastelloy X (UNS N06002) | Good oxidation resistance. |
Conclusion
In conclusion, Hastelloy is better choice for high temperature and harsh condition whereas Monel have high strength and toughness but it can be used for room temperature corrosive condition. Hastelloy grades are more expensive than Monel Alloys.
If you are looking to buy Monel or Hastelloy products you can contact as sales@fit-lok.com