MONEL
INCONEL
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AEETHER

INCOLOY
HASTELLOY
UNS N05500

Monel Alloy
K-500

W.Nr. 2.4375
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Introduction
Main Standards
Chemical Composition
Data Sheet
Applications
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Monel K-500 Introduction

logo of precipitation strengthened alloy

Precipitation
Strengthened Alloy

Nickel
Copper
Corrosion
Resistance
87
Mechanical
Behavior
86
Purity
84

Corrosion Resistance

Sulfuric
Acid

Hydrochloric
Acid

Hydrofluoric
Acid

Phosphoric
Acid

Nitric
Acid

Organic
Acids

Alkalies
and Salts

Seawater

Overview

As a leading supplier & manufacturer in China, AEETHER supply cost-effective Monel K-500 Products.

MONEL® alloy K-500 (UNS N05500 / W.Nr. 2.4375) is a nickel-copper alloy which combines the excellent corrosion resistance of MONEL alloy 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.

Typical applications for MONEL alloy K-500 products are 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; and sensors and other electronic components.

A useful characteristic of the alloy 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 strip 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 has been used to advantage in a number of applications, notably oil-well surveying equipment and electronic components.

MONEL alloy K-500 has been found to have exceptionally good dimensional stability, both in long-time exposure tests and in cyclic tests. This property of the alloy has led to its use in high-precision devices, such as gyros. Age hardening causes an initial volume contraction. An annealed rod contracted 2.5 x 10-4 in. per in. during aging.

Mechanical Properties

The low-temperature properties of MONEL alloy K-500 are outstanding. Tensile and yield strengths increase with decrease in temperature while ductility and toughness are virtually unimpaired. No ductile-to-brittle transformation occurs even at temperatures as low as that of liquid hydrogen. Thus the alloy is suitable for many cryogenic applications.

Properties of alloy K-500 base metal and welded sheet at temperatures down to -423°F. Welds can be produced with the strength of agehardened base metal with no serious loss in ductility if aging treatments are performed after welding annealed material. Welding of age-hardened material should be avoided because of greatly reduced ductility.

Corrosion Resistance

The corrosion resistance of MONEL alloy K-500 is substantially equivalent to that of alloy 400 except that, when in the age-hardened condition, alloy K-500 has a greater tendency toward stress-corrosion cracking in some environments.

MONEL alloy K-500 has been found to be resistant to a sour-gas environment. After 6 days of continuous immersion in saturated (3500 ppm) hydrogen sulfide solutions at acidic and basic pHs (ranging from 1.0 to 11.0), U-bend specimens of age-hardened sheet showed no cracking. Hardness of the specimens ranged from 28 to 40 Rc.

The combination of very low corrosion rates in highvelocity sea water and high strength make alloy K-500 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.

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Monel K-500 Standards

ASTM B865
Rod and Bar
SAE AMS 4676
Rod and Bar
AWS A5.14 ERNiCu-8
Filler Metal

Monel K-500 Chemical Composition

Data Sheet

Physical Properties

Density g/cm3 8.44
lb/in.3 0.305
Melting Range °F 2400 - 2460
°C 1315 - 1350
Modulus of Elasticity Tension 103 ksi 26.0
Torsion 103 ksi 9.5
Poisson’s Ratio Aged material at room temperature 0.32

Mechanical Properties

Form and Condition Tensile Strength Yield Strength
(0.2% Offset)
Elongation,
%
Hardness
ksi MPa ksi MPa Brinell
(3000-kg)
Rockwell B
Rod and Bar
Hot-Finished 90-155 621-1069 40-110 276-758 45-20 140-315 75B-35C
Hot-Finished, Aged 140-190 965-1310 100-150 690-1034 30-20 265-346 27-38C
Hot-Finished, Annealed 90-110 621-758 40-60 276-414 45-25 140-185 75-90B
Hot-Finished, Annealed and Aged 130-165 896-1138 85-120 586-827 35-20 250-315 24-35C
Cold-Drawn, As-Drawn 100-140 690-965 70-125 483-862 35-13 175-260 88B-26C
Cold-Drawn, Aged 135-185 931-1276 95-160 655-1103 30-15 255-370 25-41C
Cold-Drawn, Annealed 90-110 621-758 40-60 276-414 50-25 140-185 75-90B
Cold-Drawn, Annealed and Aged 130-190 896-1310 85-120 586-827 30-20 250-315 24-35C
Sheet, Cold-Rolled
Annealed 90-105 621-724 40-65 276-448 45-25 - 85B max.
Strip, Cold-Rolled
Annealed 90-105 621-724 40-65 276-448 45-25 - 85B max.
Annealed and Aged 130-170 896-1172 90-120 621-827 25-15 - 24C min.
Spring Temper 145-165 1000-1138 130-160 896-1103 8-3 - 25C min.
Spring Temper, Aged 170-220 1172-1517 130-195 896-1345 10-5 - 34C min.
Tube and Pipe, Seamless
Cold-Drawn, Annealed 90-110 621-758 40-65 276-448 45-25 - 90B max.
Cold-Drawn, Annealed and Aged 130-180 896-1241 85-120 586-827 30-15 - 24-36C
Cold-Drawn, As-Drawn 110-160 758-1103 85-140 586-965 15-2 - 95B-32C
Cold-Drawn, As-Drawn, Aged 140-220 965-1517 100-200 690-1379 25-3 - 27-40C
Plate
Hot-Finished 90-135 621-931 40-110 276-758 45-20 140-260 75B-26C
Hot-Finished, Aged 140-180 965-1241 100-135 690-981 30-20 265-337 27-37C
Wire, Cold Drawn
Annealed 80-110 552-758 35-65 241-448 40-20 - -
Annealed and Aged 120-150 827-1034 90-110 621-758 30-15 - -
Spring Temper 145-190 1000-1310 130-180 896-1241 5-2 - -
Spring Temper, Aged 160-200 1103-1379 140-190 965-1310 8-3 - -
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Monel K-500 Applications

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