ASTM B865 Monel K500 Nickel Copper Alloy Forging Bar Corrosion Resistant Material for Marine Offshore Engineering

ASTM B865 Monel K500 (UNS N05500) Nickel Copper Alloy Forging Bar

The Monel K500 (UNS N05500) forging bar is a precipitation-hardenable nickel-copper alloy that combines the excellent corrosion resistance of Monel 400 with the added advantages of greater strength and hardness. Manufactured in full compliance with ASTM B865 standards, this alloy is the material of choice for demanding marine and offshore engineering applications where both mechanical performance and environmental durability are critical.

Key Features

• Exceptional Corrosion Resistance: Outstanding resistance to seawater, brackish water, and a wide range of chemical environments including hydrofluoric acid, sulfuric acid, and alkaline solutions.
• Age-Hardenable: Precipitation hardening treatment provides significantly higher strength and hardness compared to Monel 400, with tensile strength exceeding 965 MPa.
• Low Magnetic Permeability: Non-magnetic down to cryogenic temperatures, making it ideal for sensitive marine instrumentation and electronic applications.
• High Fatigue Strength: Excellent resistance to fatigue and stress corrosion cracking in chloride-rich environments such as seawater.
• Good Weldability: Compatible with standard welding procedures including GTAW, SMAW, and GMAW for fabrication of complex components.

Chemical Composition (Typical)

Typical Applications

• Marine Engineering: Propeller shafts, pump shafts, valve stems, seawater piping, and fasteners exposed to marine environments.
• Offshore Oil & Gas: Subsea bolting, wellhead components, instrument housings, and downhole tools.
• Chemical Processing: Heat exchanger components, filter parts, and reaction vessels handling corrosive media.
• Power Generation: Steam turbine components, condenser tubes, and high-pressure pump shafts.
• Naval & Defense: Non-magnetic fasteners, sensor housings, and structural components for submarines and surface vessels.

Available Size Range

• Diameter: 10mm to 300mm (custom diameters available upon request)
• Length: 1,000mm to 6,000mm (longer lengths available upon request)
• Surface Finish: Hot forged, cold drawn, centerless ground, polished
• Tolerance: H8, H9, H10, H11 per customer specification

Quality Assurance

Every lot is supplied with full mill test certification including chemical analysis, mechanical property test results, and ultrasonic testing (UT) to ASTM A388 or equivalent. Third-party inspection by SGS, BV, or TÜV available upon request.

Contact us today for a competitive quotation on ASTM B865 Monel K500 forging bars tailored to your specifications.