Monel K-500


Age-Hardened version of Monel alloy 400 for increased strength and hardness, totally non-magnetic and spark resistant. Small additions of aluminum and titanium are added to form the K-500 alloy with the same corrosion resistance but with much greater strength due to gamma prime formation on aging. Compared to steel, Monel is very difficult to machine as it work-hardens very quickly. It needs to be turned and worked at slow speeds and low feed rates. It is resistant to corrosion and acids, and some alloys can withstand a fire in pure oxygen.

Major Applications include pump shafts, doctor-blades and scrapers, oil well tools and instruments, electronic components, springs, valve trim, fasteners and marine propeller shafts.(B)

Analysis in Weight Percent:

              Ni (+ Co)             63.0 min               Cu               27.0 - 33.0

              Fe                        2.0                       Mn                    1.5

              Si                         0.5                       S                     0.01 

              Al                        2.30 - 3.15             Ti                 0.35 - 0.85

Mechanical Properties (at Room Temperature):

                                                                           MPa                ksi

Ultimate Tensile Strength:                                1100               160

Yield Strength (0.2% offset):                            790                115

                                                                         GPa            106 psi

Elastic Modulus (Tension):                               180                26

Elongation in 50mm (2 in): 20%

Hardness: 300 HB

Physical Properties (at Room Temperature):

                                                                      oC                        oF 

Melting Point/Range:                             1315 - 1350         2400 - 2460

Curie Temperature:                                   -134                   -210

                                                                J/kg ⋅ K              Btu/lb ⋅ oF

Specific Heat:                                             419                     0.100

                                                               µm/m ⋅ K              µin/in ⋅ oF

Average Coefficient of Thermal Expansion: 13.7                    7.6

                                                          W/m ⋅ K                Btu ⋅ in/ft2 ⋅ h ⋅ oF

Thermal Conductivity:                           17.5                          121

Electrical Resistivity (nΩ ⋅ m): 615

Density (g/cm3): 8.44

Corrosion Resistance: (A)

Sulfuric Acid:                   1                        Hydrochloric Acid:     2

Hydrofluoric Acid:           1                        Phosphoric Acid:        1

Nitric Acid:                      3                         Organic Acid:             1

Alkalies:                          1                        Salts:                          1

Seawater:                        1                        Chlorine Cracking:     1

High Temp. Resistance (1000 oF): (A)

Oxidation:                                                      3

Carburization:                                               3

High Temperature Strength and Stability:   3

ASTM(B) ASME (SB):    ---

ASME Boiler Code:        Code Cases 1192, N-119

SAE AMS:                     4676

UNS:                            N05500


(A) 1 - Good to excellent; 2 - Acceptable; 3 - Not Recommended.

(B) This column is provided for your convenience, ESPI cannot and does not make recommendations of type or grade of material for end use. Proper selection of material for proposed end use is our customer's responsibility.

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