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Materials / Monel K-500

Monel K-500Marine strength

A precipitation-hardened nickel-copper alloy combining marine corrosion resistance with higher mechanical strength.

Material specification overviewCompare Materials

Material positioning

Monel K-500 Fasteners

A nickel-copper alloy considered for loaded marine and offshore components where corrosion resistance, strength and control of the final heat-treated condition are reviewed together.

Positioning
High-strength marine service
Available forms
Bolts, studs, nuts, machined parts and round bar
Documentation
Material certification, heat treatment and mechanical testing
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Engineering reference

Performance and service profile

Representative information for preliminary review. Final values depend on product form, dimensions, heat treatment and governing specification.

Typical tensile strengthTypically 965-1,100 MPa for age-hardened bar, depending on size and condition
Typical yield strengthTypically 655-760 MPa for age-hardened bar, depending on size and condition
Reference conditionSolution annealed and age hardened
Temperature capabilityPrimarily selected for high-strength marine service; allowable elevated-temperature use must follow the applicable bolting code and heat-treated condition.
Corrosion characteristicsMarine corrosion behavior broadly similar to Monel 400, combined with substantially higher age-hardened strength.
Typical heat treatmentSolution annealing followed by precipitation age hardening

Typical applications

  • Pump shafts and impellers
  • Marine hardware
  • Offshore equipment
  • High-strength seawater fasteners

Standards support

  • ASTM B865
  • ASME Code Case requirements where applicable
  • Project-specific fastener specifications

Documentation support

  • MTC / MTR
  • Heat-treatment chart
  • Mechanical test report
  • Hardness verification
  • PMI and traceability records