Inconel 625 and Monel 400
What is the difference between Alloy 400 and 625?
Alloy 400 has a tensile strength of about 600 MPa and good ductility, making it tougher and more impact-resistant at room temperature. Alloy 625 has higher tensile strength (830-1034 MPa) and yield strength due to the presence of niobium and molybdenum, which also enhances its ability to resist deformation under stress.
What material is Monel 400?
Nickel Copper Alloy
Monel 400 is a nickel-copper alloy that is resistant to high temperature seawater and steam as well as salt and alkaline solutions. Monel 400 is a nickel-copper alloy that has excellent corrosion resistance in a wide range of media.
Why use Inconel 625?
INCONEL Nickel-Chromium Alloy 625 (UNS N06625/W.Nr. 2.4856) is used in a wide range of applications due to its high strength, excellent processing properties (including joining properties), and outstanding corrosion resistance. Its operating temperature range is from cryogenic to 1800°F (982°C).
Does Monel 400 rust?
Monel 400 is a nickel-copper alloy whose general properties include good corrosion resistance, good weldability, and medium to high strength. It can withstand attack by hot seawater and steam, as well as alkaline solutions and salts.
Inconel 625 VS Monel 400
Inconel 625 vs Monel 400 – 1. Definition
First, let's take a look at Inconel 625. This nickel-chromium-molybdenum alloy is known for its excellent resistance to oxidation and corrosion, even at high temperatures. Its high strength, toughness, and good processing properties make it a top choice for harsh environments. Inconel 625 is widely used in the aerospace industry, where parts are exposed to extreme heat and corrosive environments. It is also a common choice in the chemical processing industry, where resistance to a wide range of chemicals is critical.
Monel 400, on the other hand, is a nickel-copper alloy known for its excellent corrosion resistance in marine and freshwater environments. It has strong resistance to stress corrosion cracking and is often used in applications that require exposure to seawater, such as offshore oil and gas drilling. Monel 400 also has good ductility and strength, making it suitable for a variety of forming processes.
Inconel 625 vs Monel 400 – 2. Composition
| Element / Requirement | Material 400 | Material 625 |
|---|---|---|
| S (Sulfur) | ≤ 0.024% | ≤ 0.015% |
| C (Carbon) | ≤ 0.30% | ≤ 0.10% |
| Si (Silicon) | ≤ 0.50% | ≤ 0.50% |
| Mn (Manganese) | ≤ 2.00% | ≤ 0.50% |
| P (Phosphorus) | - | ≤ 0.015% |
| Al (Aluminum) | - | ≤ 0.40% |
| Ti (Titanium) | - | ≤ 0.40% |
| Fe (Iron) | ≤ 2.5% | ≤ 5.0% |
| Cr (Chromium) | - | 20.0% ~ 23.0% |
| Mo (Molybdenum) | - | 8.0% ~ 10.0% |
| Nb + Ta (Niobium + Tantalum) | - | 3.15% ~ 4.15% |
| Cu (Copper) | - | 28.0% ~ 34.0% |
| Monel 400 | Inconel 625 | |
|---|---|---|
| Density, g/cm³ | 8.80 | 8.44 |
| Density, lb/in.³ | 0.318 | 0.305 |
| Melting Range, °F | 2370-2460 | 2350-2460 |
| Melting Range, °C | 1300-1350 | 1290-1350 |
| Curie Temperature, °F | 70-120 | <-320 |
| Curie Temperature, °C | 21-49 | -196 |
Conclusion
Gnee Steel is a supplier of alloy 400 and alloy 625, including tubes, pipes, plates, strips, plates, round bars, flat bars, forged billets, hexagons, wire and extrusions. We work with steel mills to provide customers with 625 alloy, and its products meet or exceed many leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN and BS standards.
Gnee Steel stocks and sells alloy 400 and alloy 625 tubes, pipes, plates, strips, plates, round bars, flat bars, forged billets, hexagons, wire and extrusions. You are welcome to contact us for a quote at any time at ss@gneesteel.com
