properties of monel(r) alloy k-500

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Super Alloy Monel(r) Alloy K-500

Chemistry Data

Aluminum

2.3 - 3.15

Carbon

0.25 max

Copper

27 - 33

Iron

2 max

Manganese

1.5 max

Nickel

Balance

Silicon

0.5 max

Sulphur

0.01 max

Titanium

0.35 - 0.85

General Information

Principal Design Features

This is an age-hardenable version of the nickel-copper alloy Monel 400. As such it has increased strength with the excellent resistance to sea water corrosion.

Applications

Sea water pump shafts and impellers as well as being used in the oil well industry for valve trim and other components.

Machinability

The best machinability for this alloy is in the annealed condition. It may be machined in the aged condition, but the preferred practice is to rough machine as close to finish as possible in the annealed condition. Then aging and final machining may be done. A very slight dimensional contraction occurs upon aging. In general this alloy, in the annealed condition, machines in a manner similar to that of the austenitic (300 series) stainless steels.

Forming

The alloy has good ductility and is readily formed in the annealed condition by standard means.

Welding

All of the conventional welding techniques may be used on this alloy. However it is best to weld with the alloy in the annealed condition and the finished weldment should then be stress-relief annealed. Exposure to temperatures in the age-hardening range (900 F to 1100 F) should be avoided except when the final age-hardening treatment is to be accomplished.

Heat Treatment

The alloy may be annealed after cold working and also may be precipitation-hardened by an aging heat treatment.

Forging

Forging should be done in the range of 2100 F to 1900 F. Water quench immediately after forging.

Hot Working

The hot work temperature range is 2100 F to 1600 F. Water quench immediately after hot working and do not allow to cool below 1600 F.

Cold Working

The alloy has good ductility and may be cold worked by standard means.

Annealing

Anneal at 1900 F and water quench.

Aging

For annealed, or slightly cold-worked, material age-hardening is done at 1125 F for 16 hours and then furnace cooling at a rate of 15 F to 25 F per hour down to a temperature of 900 F. Cooling rate from 900 F to room temperature is not critical. For severely cold-worked material aging should be done at 1000 F for at least 6 hours and then furnace cooled to 900 F at the 15 F to 25 F per hour rate.

Hardening

See "Aging".

Other Mechanical Props

Tensile values for annealed & aged bar.

Physical Data

Density (lb / cu. in.)

0.305

Specific Gravity

8.44

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.107

Electrical Resistivity (microhm-cm (at 68 Deg F))

370

Melting Point (Deg F)

2440

Poissons Ratio

0.32

Thermal Conductivity

121

Mean Coeff Thermal Expansion

7.6

Modulus of Elasticity Tension

26

Mechanical Data

Form

Plate

Condition

Hot Finished

Temper

70

Tensile Strength

112

Yield Strength

65

Elongation

32

Form

Plate

Condition

Hot Finished & Aged

Temper

70

Tensile Strength

160

Yield Strength

117

Elongation

25

Form

Sheet

Condition

Annealed

Temper

70

Tensile Strength

98

Yield Strength

52

Elongation

35

Rockwell

B90

Form

Strip

Condition

Annealed

Temper

68

Tensile Strength

98

Yield Strength

52

Elongation

35

Form

Strip

Condition

Spring Temper, Aged

Temper

70

Tensile Strength

195

Yield Strength

162

Elongation

7