K-500

Alloy K-500 is a nickel-copper alloy, which combines the excellent corrosion resistance of alloy 400 with the added advantages of greater strength and hardness. Alloy K-500 provides roughly three times the yield strength of alloy 400. The increased properties are obtained by adding aluminum and titanium to the nickel-copper base and age hardening. The aging process precipitates submicroscopic particles of Ni3 (Ti, Al) throughout the matrix.

The combination of low magnetic permeability, high strength and good corrosion resistance have been used in a number of applications, notably oil - well surveying equipment and electronic components. A useful characteristic of the alloy is that it is virtually nonmagnetic, even at quite low temperatures. Age hardening causes an initial volume contraction. An annealed rod contracted 2.5 x 10-4 in/in during aging. The following is a typical age-hardening procedure to achieve of optimal properties.

Anneal at 1800°F for 30 minutes followed by a water quench. Hold for 16 hours at 1100 - 1125°F followed by furnace cooling at a rate of 15 - 25°F per hour to 900°F. Cooling from 900°F to room temperature may be carried out by furnace or air cooling, or by quenching, without regard to cooling rate.

Chemistry

 NiMnCuSiCSTiAlFe
MIN 63.0 -- 27.0 -- 0.35 2.3 --
MAX 70.0 1.5 33.0 0.5 0.25 0.01 0.85 3.15 2.0

Specifications

ASME Bolting Code Case 1192
ASTM B 865
ISO 15156-3
NACE MR0175UNS N05500
W. NR./EN 2.4375

Inventory

K-500 Pipe, K-500 Plate, K-500 Sheet

Common Trade Names

Monel K-500, Alloy K-500

Features

  • High strength
  • Corrosion resistance similar to Alloy 400

Applications

  • Pump shafts and impellers
  • Valve trim
  • Oil well drill collars
  • Marine fasteners
  • Marine propeller shafts

Physical Properties

Density: 0.306 lb/in3
Melting Range: 2400 - 2460°F
Poisson's Ration: 0.32

Temperature, °F -320 -250 -100 70 200 400 600 800 1000 1200
Coefficient* of Thermal Expansion, in/in°F x 10-6 6.2 6.5 6.8 -- 7.6 8.1 8.3 8.5 8.7 9.1
Thermal Conductivity
Btu • ft/ft2 • hr • °F
-- 7.2 8.6 10.1 11.3 13.0 14.8 16.5 18.3 20.0

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASME B 168

Ultimate tensile strength, ksi 110
0.2% yield strength, ksi 80
Elongation, % 20
Hardness MAX, Brinell 310

Typical Tensile Properties

Temperature, °F 212 302 392 482
Ultimate Tensile Strength, ksi 98.2 95.7 92.8 91.3
0.2% Yield Strength, ksi 65.3 60.9 58.0 55.1