What is the difference between Monel 400 plate and K500 plate
Monel 400 alloy plate is a solid solution strengthened alloy with good strength and corrosion resistance, while Monel K500 plate is an age hardened alloy that can be heat treated to achieve higher strength and hardness. K500 alloy is more susceptible to stress corrosion cracking in certain environments than Monel 400 alloy plate.
What is Monel 400 Plate?
Monel 400 Plate is a nickel-copper alloy that is resistant to high-temperature seawater and steam, as well as salt and alkaline solutions. Monel 400 Alloy Plate is a nickel-copper alloy that has excellent corrosion resistance in a wide range of media.

What is the annealing temperature of Monel K500 alloy plate?
The annealing temperature range is 850 to 1,000 °C (1,562 to 1,832 °F), the holding time is 3 to 5 minutes per mm thickness, and the optimal temperature is 980 °C (1,796 °F). It is not recommended to go above 1,000 °C (1,832 °F) as this may cause strong grain growth.
Will Monel 400 Plate Rust?
Monel 400 alloy plate is a nickel-copper alloy characterized by good corrosion resistance, good weldability, and medium to high strength. It also withstands attack by high-temperature seawater and steam, as well as alkaline solutions and salts.
Key Differences Between Monel K500 Plates and Monel 400 Plates
1. Mechanical strength and hardness of monel 400 sheet vs monel k500 plate
Due to precipitation hardening, Monel K500 sheet is significantly stronger than Monel 400 sheet.
K500 sheet has a yield strength nearly twice that of Monel 400 sheet, making it suitable for more demanding structural applications.
If your application involves high pressure or mechanical stress, Monel K500 sheet is the best choice.
2. Corrosion resistance of Monel 400 and Monel K500
Both grades offer excellent corrosion resistance, but with slight differences.
Monel 400 performs well in hydrofluoric and sulfuric acid environments.
Monel K500 plate also withstands these environments, but has an advantage in sour gas (H₂S) conditions due to its higher strength.
However, Monel K500 is more susceptible to stress corrosion cracking in certain environments than Monel 400.
3. Magnetic properties of Monel 400 and Monel K500 sheets
One of the standout features of Monel K500 plates is that they remain non-magnetic even after being hardened, making them suitable for sensitive electronic or instrumentation environments.
Monel 400 plates are also non-magnetic, but some cold-working can induce slight magnetism.
4. Dimensional information of Monel 400 and Monel K500 sheets
400 Monel Sheet Thickness
| SIZES (INCH) | SIZES (mm) |
|---|---|
| .125" | 3.18mm |
| .134" | 3.40mm |
| .156" | 3.96mm |
| .187" | 4.75mm |
| .250" | 6.35mm |
| .312" | 7.92mm |
| .375" | 9.53mm |
| .500" | 12.7mm |
| .625" | 15.9mm |
| .750" | 19.1mm |
| .875" | 22.2mm |
| 1" | 25.4mm |
| 1.125" | 28.6mm |
| 1.250" | 31.8mm |
| 1.500" | 38.1mm |
| 1.750" | 44.5mm |
| 2" | 50.8mm |
| 2.500" | 63.5mm |
| 3" | 76.2mm |
UNS N05500 Sheet Thickness
| SIZES (INCH) | SIZES (mm) |
|---|---|
| .125" | 3.18mm |
| .134" | 3.40mm |
| .156" | 3.96mm |
| .187" | 4.75mm |
| .250" | 6.35mm |
| .312" | 7.92mm |
| .375" | 9.53mm |
| .500" | 12.7mm |
| .625" | 15.9mm |
| .750" | 19.1mm |
| .875" | 22.2mm |
| 1" | 25.4mm |
| 1.125" | 28.6mm |
| 1.250" | 31.8mm |
| 1.500" | 38.1mm |
| 1.750" | 44.5mm |
| 2" | 50.8mm |
| 2.500" | 63.5mm |

Gnee Steel is a supplier of Monel 400 Plate And K500 Plate, covering tubes: Seamless tubes: Size: 4 - 219 mm; Thickness: 0.5 - 20 mm; Welded tubes: Size: 5.0 - 1219.2 mm; Thickness: 0.5 - 20 mm, Plates: Plate thickness 0.1 to 100 mm; Plate width 10-2500 mm, Strips, Alloy round bar sizes: diameter 3-800 mm;, Flat bar sizes: thickness 2-100 mm; Width: 10-500 mm, Hexagonal bar sizes: 2-100 mm;, Wire and extruded profiles. 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 Monel 400 Plate And K500 Plate, pipes, tubes, plates, strips, sheets, round bars, flat bars, forged billets, hexagons, wire rods and extruded profiles. You are welcome to contact us for a quote at any time at ss@gneesteel.com





