Name: Monel 405
Brand: Monel

Material Overview

Monel 405 material profile

A concise grade introduction for buyers who need to confirm composition, properties, standards, available forms and suitable applications before sending an inquiry.

Engineering profile

Monel R-405 is commonly specified for high-volume machined components requiring the corrosion resistance of Monel 400 combined with substantially improved machinability. Its controlled sulfur content produces nickel-copper sulfide inclusions that act as chip breakers during automatic screw machining. The alloy is supplied primarily as round bar, rod, hexagonal bar, wire and machining stock for fasteners, valve components, meter parts, pump components, fittings and precision-turned parts used in marine, chemical-processing and industrial equipment.

Technical data on this page is for material selection reference. Final acceptance values should be confirmed by the purchase standard, heat treatment condition, product form, size and material test certificate.

Chemical Composition

Monel 405 composition range

The following table shows common limiting composition values for Alloy 625 / UNS N06625. Actual product chemistry is reported by heat on the material test certificate.

Element	Symbol	Typical Requirement	Role in Alloy R-405
Nickel plus Cobalt	Ni + Co	63.0 min	Forms the corrosion-resistant matrix and provides resistance to caustic solutions, seawater and reducing environments.
Copper	Cu	28.0-34.0	Supports corrosion resistance in marine environments, reducing acids and many industrial chemicals.
Iron	Fe	2.5 max	Controlled alloying element that contributes to strength and balances the nickel-copper matrix.
Manganese	Mn	2.0 max	Contributes to solid-solution strengthening and assists metallurgical processing.
Carbon	C	0.30 max	Controlled to balance strength, ductility and machining performance.
Silicon	Si	0.50 max	Controlled minor element affecting processing and deoxidation.
Sulfur	S	0.025-0.060	Forms chip-breaking sulfide inclusions that substantially improve automatic machining performance.

Physical Properties

Key physical and thermal data

These values help customers compare density, thermal behavior, magnetic response and conductivity during early material selection.

Property	Metric Value	Imperial / Notes	Condition
Density	8.80 g/cm3	0.318 lb/in3	Room temperature
Melting Range	1300-1350 °C	2370-2460 °F	Typical range
Specific Heat	427 J/kg·°C	0.102 Btu/lb·°F	Approx. 21 °C
Thermal Conductivity	22.0 W/m·°C	151 Btu·in/ft2·h·°F	Approx. 21 °C
Electrical Resistivity	51.1 µΩ·cm	Approx. 307 ohm-cmil/ft	Annealed, approx. 21 °C
Modulus of Elasticity	Approx. 179 GPa	Approx. 26.0 x 10³ ksi	Room temperature
Mean Thermal Expansion	Approx. 14.2 x 10^-6/°C	Approx. 7.6 x 10^-6/°F	21-100 °C
Poisson’s Ratio	Approx. 0.32	Dimensionless	Room temperature
Curie Temperature	21-49 °C	70-120 °F	Composition dependent

Mechanical Properties

Room-temperature mechanical properties

Mechanical properties vary with product form, size, processing route and heat treatment. The table below summarizes commonly referenced nominal values for material selection.

Product Form / Condition	Tensile Strength	Yield Strength, 0.2%	Elongation	Hardness
Rod and bar – annealed	483-586 MPa	172-276 MPa	35-50%	110-140 HB / 60-76 HRB
Rod and bar – hot finished	517-621 MPa	241-414 MPa	30-45%	130-170 HB / 72-86 HRB
Rod and bar – cold drawn, as drawn	586-793 MPa	345-724 MPa	15-35%	160-245 HB
Cold drawn and stress equalized	Approx. 655 MPa	By size and reduction	By specification	By specification
Wire – cold worked	By diameter and temper	By diameter and temper	By specification	By specification

For pressure equipment, aerospace parts or project-specific acceptance, use the minimum requirements in the specified ASTM, ASME, AMS, EN or customer drawing rather than nominal values.

Standards & Specifications

Common Monel 405 standards by product form

YSN128 can quote Alloy 625 products according to ASTM, ASME, AMS, EN, DIN, ISO or customer drawing requirements. Certificate scope can be matched to the purchase order.

Product Form	Common Standards	Typical Supply Item	Certificate / Inspection
Rod and Bar	ASTM B164 / ASME SB164	Round bar, rod, hexagonal bar, square bar and automatic screw-machine stock	EN10204 3.1, chemical analysis, mechanical test and dimensional inspection
Wire	ASTM B164 / ASME SB164 and customer specification	Cold drawn wire, straightened wire and converter-produced specialty wire	Chemical analysis, tensile test, dimensions and surface inspection
Aerospace and Industrial Bar	SAE AMS 4674, SAE AMS 7234	Machining bar, precision rod and application-specific stock	Lot traceability, chemical and mechanical test certificate
Federal and Military Supply	Federal QQ-N-281, MIL-N-894 where contractually applicable	Rod, bar and machining stock	Contract inspection, traceability and test reports
Oil and Gas Components	NACE MR0175 / ISO 15156 when specifically qualified	Valve parts, fasteners, fittings and machined components	Hardness verification, MTC, PMI and project inspection
Custom Machined Components	Customer drawing and project specification	Valve seats, stems, nuts, screws, meter parts and precision-turned components	Dimensional report, PMI, surface inspection and MTC
Welding Products	AWS A5.14 ERNiCu-7, AWS A5.11 ENiCu-7 where applicable	Nickel-copper welding wire, rod and covered electrodes	Mill certificate, controlled chemistry and welding inspection

Available Product Forms

Monel 405 supply range

Review available product forms, size ranges, standards and delivery options for this alloy.

Form	Common Size Range	Delivery Condition	Typical Applications	Page Link
Pipe & Tube	Custom OD, wall thickness and length to specification	Seamless, fabricated or machined from hollow stock, subject to mill confirmation	Instrument parts, valve sleeves, bushings and custom corrosion-resistant components	View Pipe & Tube
Round Bar	Diameter 3-600 mm, custom cut lengths available	Hot finished, cold drawn, annealed, ground, polished or turned	Automatic screw-machine stock, valve stems, shafts, nuts and precision-turned parts	View Round Bar
Sheet & Plate	Custom thickness, width and length subject to project production	Hot rolled, cold rolled or converted to customer specification	Special machined blanks, wear plates and drawing-based components	View Sheet & Plate
Strip & Foil	Custom thickness and slit width subject to converter capability	Cold rolled, annealed or custom tempered	Machined contacts, small formed parts and specialized industrial components	View Strip & Foil
Wire	Diameter 0.2-12 mm, coil, spool or straight-length supply	Cold drawn, annealed, bright, ground or custom finished	Fastener production, pins, small shafts, valve parts and screw-machine components	View Wire
Fasteners	Standard and custom bolts, nuts, screws, studs and washers from M3 to M100	Machined, cold formed, rolled thread or custom finished	Marine equipment, chemical plants, pumps, valves and industrial machinery	View Fasteners
Fittings	Custom threaded and machined fittings to ASME, EN or customer drawings	Machined from bar or fabricated, annealed and inspected	Instrumentation, valve systems, chemical-processing lines and marine equipment	View Fittings
Flanges	Custom compact and industrial dimensions to drawing	Machined from bar or plate, drilled and inspected	Instrument connections, valve assemblies and drawing-based process equipment	View Flanges
Forgings	Custom dimensions subject to technical review	Special-order only; Alloy R-405 is generally not recommended for forging	Use only where the forming route and final properties have been qualified	View Forgings
Welding Wire	Diameter 0.8-4.0 mm, spool, coil or straight welding rod	Compatible ERNiCu-7 filler with clean bright finish	Joining R-405 components, nickel-copper repair welding and corrosion-resistant overlay	View Welding Wire

Material Selection Guide

When to consider Monel 405

This guide helps buyers connect service conditions with the typical advantage of Alloy 625. Final selection should consider medium concentration, temperature, pressure, fabrication, availability and budget.

Service Requirement	Why Alloy R-405 Helps	Common Product Form	Buyer Note
Automatic screw machining	Controlled sulfur forms sulfide inclusions that act as chip breakers and improve machining productivity.	Round bar, rod, hexagonal bar and wire	Specify machine type, finished dimensions, tolerance and surface requirements.
High-volume precision-turned parts	Improved chip control supports faster machining of nuts, screws, valve parts and instrument components.	Cold drawn bar, ground bar and screw-machine stock	Confirm straightness, diameter tolerance and required bar finish.
Marine and seawater components	The nickel-copper matrix provides corrosion resistance similar to Monel 400 in many seawater environments.	Bar, fasteners, shafts and machined fittings	Confirm water velocity, aeration, galvanic contact and service temperature.
Caustic and alkaline service	Alloy R-405 provides useful resistance to many alkaline and caustic solutions.	Valve parts, fasteners, bar and machined components	Review concentration, temperature and possible oxidizing contaminants.
Reducing acid environments	The alloy resists selected hydrochloric and hydrofluoric acid conditions, particularly when the media are deaerated.	Valve components, fittings, bar and fasteners	Check aeration, concentration, temperature and process impurities.
Pump and valve components	Corrosion resistance and good machinability support economical production of complex precision parts.	Round bar, hexagonal bar and finished components	Specify pressure, fluid chemistry, tolerances and inspection requirements.
Forged structural components	The sulfide inclusions that improve machining make the alloy less suitable for forging operations.	Alternative alloy selection is normally recommended	Consider Monel 400 or another forging-grade nickel-copper alloy.

Why Choose Us

Supply and quality support for Monel 405

For ranking traffic, buyers need more than a data sheet. This section gives clear trust signals for procurement, engineering and quality teams.

STASTM / ASME / AMS / EN

Quotation can be matched to project standards and product form specifications.

MTEN10204 3.1 MTC

Heat number, chemistry, mechanical properties and inspection records can be supplied.

QCPMI & Inspection

PMI, UT, dimensional inspection, visual inspection and packing check are available.

CSCustom Size

Cutting, machining allowance, rough machining and drawing-based supply can be arranged.

EPExport Packing

Wooden case, bundle, waterproof protection and international shipping documents.

RFFast Technical Reply

Send grade, size, standard, quantity and destination for a practical quotation route.

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FAQ

Monel 405 questions from buyers

Find practical answers about procurement, standards, fabrication and industrial applications.

Monel R-405 is mainly used as automatic screw-machine stock for fasteners, valve components, meter parts, pump components, instrument fittings, nuts, screws, shafts and other precision-machined parts requiring nickel-copper corrosion resistance.

Yes. Monel 405 commonly refers to Monel R-405. Its standardized UNS designation is N04405, and it may also be identified as Alloy R-405, W.Nr. 2.4363 or NiCu30FeS.

Monel R-405 is the free-machining version of Monel 400. Its sulfur content is controlled between approximately 0.025% and 0.060%, producing sulfide inclusions that improve chip breaking during machining.

Monel R-405 has essentially the same general corrosion resistance as Monel 400 in many marine, alkaline and reducing environments. Actual suitability should still be confirmed against the complete service conditions.

The additional sulfur forms nickel-copper sulfide inclusions that act as chip breakers. This improves chip control and makes the alloy suitable for automatic screw machines and high-volume turning operations.

YSN128 can quote round bar, rod, hexagonal bar, square bar, wire, fasteners and finished machined components. Other forms can be discussed as custom project orders, subject to production-route confirmation.

The principal product standard is ASTM B164 or ASME SB164 for rod, bar and wire. Other referenced specifications include SAE AMS 4674, SAE AMS 7234, Federal QQ-N-281 and project-specific requirements.

Yes. Monel R-405 can be joined by standard welding, brazing and soldering methods using procedures similar to those used for Monel 400. Compatible filler metals commonly include ERNiCu-7 wire and ENiCu-7 covered electrodes.

Monel R-405 is generally not recommended for forging because its sulfide inclusions are optimized for machining rather than extensive hot deformation. Monel 400 is usually a more appropriate choice for forged components.

Please send the grade or UNS number, bar shape, diameter or across-flats dimension, length, quantity, applicable standard, delivery condition, dimensional tolerance, surface finish, certificate requirements and destination. Drawings are recommended for finished machined components.

Monel 405