Monel alloy K500 plate

What is Monel alloy K500 plate?

Monel K500 alloy is a new type of alloy material with excellent corrosion resistance, as well as higher strength and hardness than Monel 400. This is due to the addition of elements such as Al and Ti to the alloy and the presence of diffuse intermetallic compounds in the matrix after certain heat treatments. The organizational structure is a single-phase austenitic organization and precipitation by diffuse Ni3 (Al, Ti) precipitation phase.Monel K500 has approximately three times the yield strength and twice the tensile strength of Monel 400, and higher mechanical properties can be obtained by cold working or age hardening. Monel K500 alloy has the same corrosion resistance as Monel 400 alloy.
Monel K500 alloy is mainly used for pump shafts and impellers, conveyor scrapers, oil well drilling rings, elastic parts, valve gaskets and so on. Others can also be manufactured for a variety of heat transfer equipment, boiler feedwater heaters, petroleum and chemical piping, vessels, towers, tanks, valves, pumps, reactors, shafts, and more. Due to the low corrosion rate in flowing seawater and the high strength of this alloy, Monel K500 is suitable for the manufacture of centrifugal pump shafts resistant to seawater corrosion. Suitable for both stationary and flowing seawater.
Elemental content(%)
Nickel：63.0min
Copper ：27min~33max
Iron ：2.0max
Manganese：1.5max
Carbon：0.25max
Silicon：0.5max
Aluminum：2.3min~3.15max
Titanium：0.35min~0.85max
Sulfur：0.01max

Monel K500 alloy is a Ni-Cu based alloy, which retains the excellent corrosion resistance of Monel 400 alloy by precipitation precipitation of Ni3 (Al, Ti) phase with the addition of small amounts of Al and Ti elements, and has high strength due to the precipitation strengthening. The alloy exhibits excellent corrosion resistance in seawater, acids, alkalis, and salts, and has room-temperature strength and hardness comparable to Ni-Cr-based alloys and precipitation-hardened low-alloyed steels, with toughness and plasticity even at low temperatures down to -25 K, and strength up to 920 K. The alloy is particularly well suited for use in the shafts of electric submersible pumps used in offshore oil production.
Monel K500 trace elements added to the high temperature plasticity effect
(1) The addition of trace Mg to Monel K-500 alloy can improve the bonding force at grain boundaries and improve the high temperature plasticity.

(2) The high temperature plasticity of the experimental alloy with the addition of trace elements of Mg, Cr and Co is significantly improved, and it shows a certain degree of superplasticity, with a strain rate sensitivity index m of 0.32 at 1010℃ and a maximum elongation of 240%.

(3) Calculations using the fracture function theory of impurity elements in the grain-boundary bias show that Mg, Cr and Co have the effect of improving the grain-boundary bonding force of Ni-Cu alloys, and thus can improve the high-temperature plasticity of Monel K-500 alloy.

(4) The deformation activation energy during superplastic deformation is low, and the process may be controlled by diffusion.

The following points need to be noted when processing this  Alloy Steel Material:
Monel K500 age cracking prevention
(1) MonelK-500 Alloy Steel larger cold deformation, has a strong tendency to age cracking crack sprouting on the surface and expanding to the heart, both through the crystal type and along the crystal type.

(2) The residual stresses caused by cold working coupled with the aging thermal stresses, as well as the preferential embrittlement of the surface layer at the early stage of aging are the main causes of aging cracking in MonelK500 alloy.

(3) Mechanical straightening after cold working is conducive to the relaxation and adjustment of residual stresses caused by cold working, which can effectively prevent the tendency of ageing cracking in Monel K-500 alloy.