Monel R-405

Update : 2026-02-25

Monel R-405
Monel R-405 (UNS N04405) is a free-machining nickel-copper alloy, a modified grade of Monel 400 with controlled sulfur addition for improved chip breaking and machinability. It retains excellent corrosion resistance to seawater, acids, alkalis, and chloride environments, while offering good mechanical strength and ductility. It features stable performance across low to elevated temperatures, good weldability, and resistance to stress corrosion cracking. Ideal for precision machined parts, it balances superior machinability and reliable corrosion performance.
Equivalent Grade

UNS: N04405

W.Nr.: 2.4361

Chinese Standard: NS3102

Standard

● Sheet/Plate: ASTM B127

Seamless Pipe: ASTM B163

Bar: ASTM B164

Designed specifically for free cutting, complying with free-cutting nickel-copper alloy standards

Alloy TypeNickel-Copper Alloy (Free-Cutting Type, Chromium-Free, Selenium-added to improve machinability)
StandardSheet, Bar, Pipe, Tube, Fittings, Flange, Welding Materials, Forgings, Free-Cutting Bars, Precision Mechanical Parts
Key Properties

● Inherits the excellent corrosion resistance of Monel 400, resistant to seawater, salt solutions and neutral/alkaline media

Selenium-added for excellent machinability, processing efficiency much higher than ordinary Monel alloys

Stable mechanical properties, good strength and toughness, good hot and cold forming performance

Resistant to hydrofluoric acid and fluoride corrosion, no stress corrosion cracking tendency, good weldability

Applicable EnvironmentCorrosion-resistant scenarios requiring precision cutting, offshore engineering, seawater desalination, fluorine chemical industry, oil and gas extraction, shipbuilding, precision mechanical processing
Typical ApplicationsPrecision Mechanical Cutting Parts, Valve Cores, Pump Components, Marine Precision Pipe Fittings, Fluorine Chemical Equipment Accessories, Oil And Gas Pipeline Connectors, Instrumentation Components, etc.


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