The corrosion resistance of alloy K-500 is substantially equivalent to that of alloy 400 except that when in the age-hardened condition, nickel alloy K-500 has a greater tendency toward stress-corrosion cracking in some environments. Monel K-500 has been found to be resistant to a sour-gas environment. The combination of very low corrosion rates in high-velocity sear 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.
|63.0-70.0||Remainder||2.30-3.15||.35-.85||.25 max||1.5 max||2.0 max||.01 max||.50 max|
In what applications is Monel K-500 used?
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
Fabrication with Monel K-500
Monel K-500 is readily fabricated by standard commercial procedures.
Welding alloy K-500 is best accomplished by the gas-tungsten-arc welding process. It is recommended that Monel K-500 be annealed when it is welded and that any weldments be stress relieved prior to aging.
Heavy machining of this alloy is best accomplished when the material is in the annealed condition or hot-worked and quenched condition. Age-hardened material however can be finish-machined to close tolerances and fine finishes. Therefore, the recommended practice is to machine slightly oversize, age-harden, then finish to size. During aging, a slight permanent contraction takes place, but little warpage occurs because of the low temperatures and slow cooling rates involved.
|AMS 4676||AMS 4676|
Typical Room Temperature Tensile Properties of Annealed Material
|Product Form||Condition||Tensile (ksi)||.2% Yield (ksi)||Elongation %||Hardness|
|Rod & Bar||Hot-Finished/Aged||140-190||100-150||30-20||27-38 HRC|
|Rod & Bar||Hot Finished/Annealed||90-110||40-60||45-25||75-90 HRB|
|Rod & Bar||Hot Finished/Annealed/Aged||130-165||85-120||35-20||24-35 HRC|
|Rod & Bar||Cold-Drawn/Aged||135-185||95-160||30-15||25-41 HRC|
|Rod & Bar||Cold-Drawn/Annealed/Aged||130-190||85-120||30-20||24-35 HRC|
|Sheet||Cold-Rolled/Annealed||90-105||40-65||45-25||85 HRB Max|