How to tell the difference between Monel 400 and Monel K-500 alloy wire mesh?

Monel 400 and Monel K-500 all are the grades of the Nickel Copper Alloy wire meshes,  they are both with high corrosion resistance features. but some differences as well.
There are the following main differences between Monel 400 and K-500:
  1. Chemical Composition

    Alloy Model Nickel (Ni) Content Copper (Cu) Content Aluminum (Al) Content Titanium (Ti) Content Iron (Fe) Content Manganese (Mn) Content Carbon (C) Content Silicon (Si) Content Sulfur (S) Content
    Monel 400 63%-70% 28%-34% None None ≤2.5% ≤2% ≤0.3% ≤0.5% ≤0.024%
    Monel K-500 63%-70% 27%-33% 2.3%-3.15% 0.35%-0.85% ≤2.0% ≤1.5% ≤0.25% ≤0.01%
  2. Mechanical Properties
    • Monel 400: The yield strength is approximately 240 MPa, the tensile strength is approximately 520 MPa, and the ductility is 45%. It has good toughness and fatigue resistance, and is suitable for occasions where the strength requirement is not particularly high.
    • Monel K-500: The yield strength can reach above 750 MPa, and the tensile strength is ≥ 1100 MPa, with a ductility of 30%. Through the addition of aluminum and titanium elements and precipitation hardening treatment, the strength and hardness are significantly improved, making it more suitable for high-stress and high-load application scenarios.
  3. Corrosion Resistance
    • Monel 400: It has excellent corrosion resistance in seawater, fresh water, steam, and various acid and alkali media. It especially has good resistance to seawater corrosion and is suitable for marine environments and chemical processing fields.
    • Monel K-500: It has similar corrosion resistance to Monel 400. At the same time, it shows more outstanding performance in stress corrosion cracking resistance. It has more advantages in some specific corrosive media environments containing sulfides, etc., and is more suitable for use in harsh petroleum, chemical and other environments.
  4. Physical Properties
    • Monel 400: It is magnetic in some cases.
    • Monel K-500: It is non-magnetic, and its density is slightly lower than that of Monel 400.
  5. Machining and Welding
    • Monel 400: It can be strengthened by cold working, with good machining performance and relatively good weldability. However, defects such as cracks and pores may occur during welding, and the corrosion resistance may decrease after welding. Appropriate welding processes and post-weld treatment measures are required.
    • Monel K-500: It has good machining performance. Preheating is required during welding to avoid cracking, and it has a high sensitivity to hydrogen embrittlement during the welding process. The welding process needs to be strictly controlled. However, the performance remains relatively good after welding.
  6. Application Fields
    • Monel 400: It is commonly used in seawater treatment devices, chemical equipment, pipelines, valves, pumps and other components in marine engineering, as well as in occasions where corrosion resistance and good machining performance are required.
    • Monel K-500: It is mainly used for engine components in the aerospace field, high-strength fasteners and springs on ships, valve stems, pump shafts, oil well drill collars in the petroleum and chemical industry, as well as other components that require high strength, high corrosion resistance and fatigue resistance.
  7. Cost
    • Monel 400: Generally, the cost is relatively low.
    • Monel K-500: Due to the addition of elements such as aluminum and titanium in the production process, and the need for complex processes such as precipitation hardening treatment, the cost is usually higher.

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