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Monel® Alloy K-500 (UNS N05500) Ni 65.5 Cu 29.5 Al 2.7, Ti 0.6

Age-hardenable version of MONEL alloy 400 for increased strength and hardness. Good strength and ductility from -423 to 1200 ºF. Pump shafts, doctor blades and scrapers, oil-well drill collars and instruments, electronic components, springs, valve trim, fasteners.

Age-hardenable Nickel-Copper alloy which combines the corrosion resistance of Alloy 400 with high strength corrosion fatigue and erosion resistance.

Alloy K-500 is a nickel-copper alloy, precipitation hardenable through additions of aluminum and titanium.
Unit of Measure

Specifications

Type

 N/A Bar

Size

 N/A 0.750 in

Alloy

 N/A K500

Physical

Density

 N/A 0.305 lb/in³

Specific Heat

 N/A 0.100 Btu/lb ºF

Electrical Resistivity

 N/A 370 ohm/cir-mil-ft

Curie Temperature

 N/A -170 ºF

Melting Range

 N/A 2400 to 2460 ºF

Thermal Expansion Coefficient at 70 to 200 Degree Fahrenheit (ºF)

 N/A 7.6 x 10-6 in/in/ºF

Mechanical

Mechanical Type

 N/A Aged

Tensile Strength

 N/A 140 to 190 ksi

Yield Strength

 N/A 100 to 150 ksi

Elongation

 N/A 30 to 20 %

Hardness

 N/A C27 - 38

Nominal Chemistry

Minimum Nickel (Ni)

 N/A 63

Maximum Iron (Fe)

 N/A 2

Cobalt (Co)

 N/A Included in Nickel

Copper (Cu)

 N/A 30

Aluminum (Al)

 N/A 2.6

Maximum Manganese (Mn)

 N/A 1.5

Maximum Silicon (Si)

 N/A 0.5

Titanium (Ti)

 N/A 0.6

Maximum Carbon (C)

 N/A 0.25

Other

 N/A S 0.01 max

General Resistance

General Resistance

 N/A Corrosion Strength

Unified Numbering System (UNS)

 N/A N05500

Werkstof

 N/A 2.4375

Sheet/Plate USA

 N/A B865 QQ-N-286

Bar/Rod USA

 N/A B865 QQ-N-286

Bar/Rod Wkstf

 N/A 17752

Forging USA

 N/A QQ-N-286

Forging Wkstf

 N/A 17754

Weld Wire

 N/A ERNiCu-7 / 17753 FM 60

Weld Electrode

 N/A ENiCu-7 FM 190

Machinability Ratings

Speed Surface

 N/A 40 ft/mm

Speed Percent (%) of B1112

 N/A 25

Note

 N/A These machinability ratios must be recognized as approximate values. They are a reasonable guide to relative tool life and lower required for cutting. It is obvious, however, that variables of speed, cutting oil, feed and depth of cut will significantly affect these ratios.

Machining Section

N/A The alloys described here work harden rapidly during machining and require more power to cut than do the plain carbon steels. The metal is 'gummy', with chips that tend to be stringy and tough. Machine tools should be rigid and used to no more than 75% of their rated capacity. Both work piece and tool should be held rigidly; tool overhang should be minimized. Rigidity is particularly important when machining titanium, as titanium has a much lower modulus of elasticity than either steel or nickel alloys. Slender work pieces of titanium tend to deflect under tool pressures causing chatter, tool rubbing and tolerance problems.

Make sure that tools are always sharp. Change to sharpened tools at regular intervals rather than out of necessity. Titanium chips in particular tend to gall and weld to the tool cutting edges, speeding up tool wear and failure. Remember- cutting edges, particularly throw-away inserts, are expendable. Don't trade dollars in machine time for pennies in tool cost.

Feed rate should be high enough to ensure that the tool cutting edge is getting under the previous cut thus avoiding work-hardened zones. Slow speeds are generally required with heavy cuts. Sulfur chlorinated petroleum oil lubricants are suggested for all alloys but titanium. Such lubricants may be thinned with paraffin oil for finish cuts at higher speeds. The tool should not ride on the work piece as this will work harden the material and result in early tool dulling or breakage. Use an air jet directed on the tool when dry cutting, to significantly increase tool life.

Lubricants or cutting fluids for titanium should be carefully selected. Do not use fluids containing chlorine or other halogens (fluorine, bromine or iodine), in order to avoid risk of corrosion problems. The speeds are for single point turning operations using high speed steel tools. This information is provided as a guide to relative machinability, higher speeds are used with carbide tooling.

Characteristics

N/A

  • Excellent mechanical properties from sub-zero temperatures up to about 480 ºC.
  • Corrosion resistance in an extensive range of marine and chemical environments. From pure water to non-oxidizing mineral acids, salts and alkalis.

Applications

N/A

  • Propeller and pump shafts.
  • Pumps and valves used in the manufacture of perchlorethylene, chlorinated plastics.

Additional Information

Additional Information

 N/A This alloy retains the excellent corrosion resistant characteristics of 400 and has enhanced strength and hardness after precipitation hardening when compared with 400. Alloy K-500 has approximately three (3) times the yield strength and double the tensile strength when compared with 400. K-500 can be further strengthened by cold working before the precipitation hardening.

Typical application for the alloy which takes advantage of high strength and corrosion resistance are pump shafts, impellers, propeller shafts, valve components for ships and offshore drilling towers, bolting, oil well drill collars and instrumentation components for oil and gas production. It is particularly well suited for centrifugal pumps in the marine industry because of its high strength and low corrosion rates in high-velocity seawater. Should be annealed when welded and the weldment then stress relieved before aging.

High Performance Alloys, Inc. stocks Alloy K-500 in a range of sizes including 3/8" to 2-1/2" diameter cold drawn, annealed and aged, and 2-3/4" to 10" diameter hot finished and aged. Material can be supplied in random lengths, cut to order or machined to your specifications. Machining includes drilling, turning, tapping, threading, CNC shapes, flanges and more.