Understanding Corrosion in Water Pipelines: A Guide for Pipeline Designers


Alloy 500

Last updated: February 14, 2019

What Does Alloy 500 Mean?

Alloy 500 is an age-hardened nickel-copper alloy, which combines high corrosion resistance, erosion resistance and low magnetic permeability. The material retains enhanced strength and hardness, and excellent corrosion resistance after precipitation hardening, while further strengthening can be achieved by cold working before the precipitation hardening.

The alloy 500 is used in oil and gas, pulp and paper, marine service and other industries. In addition, the alloy has an excellent dimensional stability, which makes it suitable for use in high-precision devices such as the gyros.

The alloy 500 is also known Monel K500.


Corrosionpedia Explains Alloy 500

The alloy 500 is made of the following elements (in percentage); Nickel 63, Copper 29.5, Aluminum 2.7, Titanium, 0.6, Carbon 0.18, Iron 2.0, Manganese 1.5, Silicon 0.50 and Sulfur 0.010.

Characteristics of the alloy 500 are largely attributed to the addition of titanium and aluminum to the nickel-copper base, followed by heating the material under controlled conditions. The age hardening thermal process enables the submicroscopic particles of the titanium and aluminum Ni3 (Ti, Al) to be precipitated throughout the matrix.

During the machining process, the alloy work hardens rapidly, generates heat when being cut, and welds to the machining tool surface in addition to resisting metal removal due to its high shear strength.

A hot working temperature of between 1600°F and 2100°F is recommended. Prolonged soaking time, especially at the higher temperature range, should be avoided. After hot working, the material should be water quenched at temperatures not lower than 1450°F. Heavy machining is best performed when the alloy is in the annealed condition, or hot worked and quenched condition. During the aging, the material undergoes a permanent contraction of about 0.0002 in/in.

  • Resistance to corrosion in a wide range of chemical and marine environments, non-oxidizing mineral salts, alkali, acids, etc.
  • Outstanding mechanical properties over a wide range of temperatures (from sub-zero to 480 degrees C).
  • Low rate of corrosion in high-velocity seawater.

The alloy 500's high corrosion resistance and strength make it ideal for environments requiring resistance to corrosion and heat, while maintaining the mechanical properties of the material. Furthermore, its low magnetic permeability and high strength make it useful in the electronic components and oil surveying equipment.

Typical applications include:

  • Fasteners, springs, propeller shafts and chains for the marine service.
  • Blades and scrapers for the pulp and paper industry.
  • Pump and valve components for chemical processes and ships.
  • Drill collars, bolting, pump shafts, valves, sensors, instruments, oil well tools, and electronic components for the gas and oil industry.

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