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Monel K500

Monel K500

Atlanta Rod manufactures Monel K500 hex bolts, studs, and nuts to your custom specifications, and we guarantee to meet your delivery schedule.  At Atlanta Rod and Manufacturing Co., Inc. we strive to provide our customers with the most innovative products and quality materials in the industry.

Monel K500 is a nickel-copper alloy which combines the excellent corrosion resistance of Monel 400 with the added advantages of greater strength and hardness. The increased properties are obtained by adding aluminum and titanium to the nickel-copper base, and by heating under controlled conditions so that submicroscopic particles of Ni3 (Ti, Al) are precipitated throughout the matrix. The thermal processing used to effect precipitation is commonly called age hardening or aging. The composition of the alloy is given below.

A useful characteristic of Monel K500 is that it is virtually nonmagnetic, even at quite low temperatures. It is possible, however, to develop a magnetic layer on the surface of the material during processing. Aluminum and copper may be selectively oxidized during heating, leaving a magnetic nickel-rich film on the outside of the piece. The effect is particularly noticeable on thin wire or strips where there is a high ratio of surface to weight. The magnetic film can be removed by pickling or bright dipping in acid, and the nonmagnetic properties of the material will be restored.

The combination of low magnetic permeability, high strength and good corrosion resistance gives this alloy and advantage has been used in a number of applications, notably oil-well surveying equipment and electronic components. Monel K500 has been found to have exceptionally good dimensional stability, both in long-time exposure tests and in cyclic tests. This property of Monel K500 has led to its use in high-precision devices, such as gyros.

The corrosion resistance of Monel K500 is substantially equivalent to that of alloy 400 except that, when in the age-hardened condition, Monel K500 has a greater tendency toward stress-corrosion cracking in some environments.

Monel K500 has been found to be resistant to a sour-gas environment. The combination of very low corrosion rates in high velocity sea water and high strength make Monel K500 particularly suitable for shafts of centrifugal pumps in marine service. In stagnant or slow-moving sea water, fouling may occur followed by pitting, but this pitting slows down after a fairly rapid initial attack

Applications for Monel K500:

  • Chains and cables, fasteners and springs for marine service
  • Pump and valve components for chemical processing
  • Doctor blades and scrapers for pulp processing in paper production
  • Oil well drill collars and instruments, pump shafts and impellers, non-magnetic housings,
  • safety lifts and valves for oil and gas production
  • Sensors and other electronic components
  • For quotes, please call, fax, or email our sales department.

Limiting Chemical Composition, %, of Monel K500

Nickel (plus Cobalt)
Silicon .

63.0 min
0.25 max
1.5 max
2.0 max
0.01 max
0.5 max
27.0 – 33.0
2.30 – 3.15
0.35 – 0.85

Information from Special Metals Corporations, owner of the Monel K500 trademark.