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Alloy K500 (often written as Monel K-500 or UNS N05500) is a nickel-copper-based alloy with added aluminum and titanium that provides high strength and excellent corrosion resistance, particularly in marine and chemical environments.
Chemical Composition
Element
Composition Range
Nickel (Ni)
63.0% minimum
Copper (Cu)
27.0–33.0%
Aluminum (Al)
2.30–3.15%
Titanium (Ti)
0.35–0.85%
Iron (Fe)
1.0–2.0%
Manganese (Mn)
up to 1.5%
Silicon (Si)
up to 0.5%
Carbon (C)
up to 0.25%
Sulfur (S)
up to 0.010%
Other elements
residual, usually very low
Key Composition Benefits
High Nickel and Copper Content
The high Ni–Cu base provides excellent corrosion resistance in seawater, brine, and many acids and alkalis, while maintaining good mechanical properties across a wide temperature range.
Aluminum and Titanium Additions
The 2–3% Al and ~0.4–0.8% Ti serve as key strengthening elements. After age-hardening heat treatment, they form finely dispersed Ni₃(Al,Ti) precipitates that significantly increase strength and hardness while largely retaining corrosion resistance.
Controlled Impurities
Elements like carbon, sulfur, silicon, and manganese are tightly controlled to improve weldability, toughness, and resistance to stress-corrosion cracking. Low sulfur particularly enhances corrosion resistance in reducing environments.
Typical Applications
Marine hardware and fasteners
Pump shafts and impellers
Valve components and springs
Oil and gas tools exposed to sour and chloride-containing environments
Material Standards
When specifying material for design or procurement, always confirm exact composition ranges from the relevant standard or mill certificate. Common standards include:
UNS N05500
ASTM B865 (for bar, rod, wire, forging stock, etc.)
These standards provide the precise allowable ranges required for material certification as Alloy K500.
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
