Monel 400

Monel 400 is a nickel-copper alloy (about 67% Ni – 23% Cu) that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Alloy 400 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good corrosion resistance, good weldability and high strength.

Characteristics of Monel 400

  • Resistant to seawater and steam at high temperatures
  • Excellent resistance to rapidly flowing brackish water or seawater
  • Excellent resistance to stress corrosion cracking in most freshwaters
  • Particularly resistant to hydrochloric and hydrofluoric acids when     they are de-aerated
  • Offers some resistance to hydrochloric and sulfuric acids at modest     temperatures and concentrations, but is seldom the material of choice     for these acids
  • Excellent resistance to neutral and alkaline salt
  • Resistance to chloride induced stress corrosion cracking
  • Good mechanical properties from sub-zero temperatures up to      1020° F
  • High resistance to alkalis

Chemical Composition, %

C Mn S Si Ni Cu Fe
.30 max 2.00 max .024 max .50 max 63.0 min 28.0-34.0 2.50 max

 

Mechanical Properties

Typical room temperature Tensile Properties of Annealed Material

Product Form

Condition Tensile (ksi) .2% Yield (ksi) Elongation (%) Hardness (HRB)
Rod & Bar Annealed 75-90 25-50 60-35 60-80
Rod & Bar Cold-Drawn Stress Relieved 84-120 55-100 40-22 85-20 HRC
Plate Annealed 70-85 28-50 50-35 60-76
Sheet Annealed 70-85 30-45 45-35 65-80
Tube & Pipe Seamless Annealed 70-85 25-45 50-35 75 max *

 

 

Monel 500

Monel K500 is a precipitation-hardenable nickel-copper alloy that combines the excellent corrosion resistance characteristic of Monel 400 with the added advantage of greater strength and hardness. These amplified properties, strength and hardness, are obtained by adding aluminum and titanium to the nickel-copper base and by a thermal processing used to effect precipitation, typically called age hardening or aging.

Characteristics of Monel K500

  • Corrosion resistance in an extensive range of marine and chemical      environments. From pure water to non-oxidizing mineral acids, salts      and alkalis.
  • Excellent resistance to high velocity sea water
  • Resistant to a sour-gas environment
  • Excellent mechanical properties from sub-zero temperatures up to      about 480C
  • Non-magnetic alloy

Chemical Composition, %

Ni Cu Al Ti C Mn Fe S Si
63.0-70.0 Remainder 2.30-3.15 .35-.85 .25 max 1.5 max 2.0 max .01 max .50 max

 

Applications of Monel K-500

  • Sour-gas service applications
  • Oil and gas production safety lifts and valves
  • Oil-well tools and instruments like drill collars
  • Oil well industry
  • Doctor blades and scrapers
  • Chains, cables, springs, valve trim, fasteners for marine service
  • Pump shafts and impellers in marine service