Name: Monel 401
Brand: Monel

Material Overview

Monel 401 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 401 is primarily specified for precision electrical and electronic applications requiring medium electrical resistivity, a very low temperature coefficient of resistance and stable performance over a broad temperature range. The alloy also provides useful corrosion resistance, good ductility, satisfactory brazing characteristics and reliable forming performance. It is commonly supplied as resistance wire, strip, foil, ribbon and custom profiles for wire-wound resistors, precision shunts, bimetal contacts, measuring instruments and electronic control components.

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 401 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 401
Copper	Cu	Balance	Forms the principal alloy matrix and contributes to electrical conductivity, corrosion resistance and ductility.
Nickel	Ni	40.0-45.0	Controls electrical resistivity, stabilizes resistance over temperature and improves corrosion resistance.
Manganese	Mn	2.25 max	Helps establish the required electrical resistance characteristics and supports solid-solution strengthening.
Iron	Fe	0.75 max	Controlled to maintain stable electrical and magnetic properties.
Cobalt	Co	0.25 max	Controlled because it can influence magnetic and electrical behavior.
Silicon	Si	0.25 max	Controlled minor element affecting processing, electrical properties and brazing behavior.
Carbon	C	0.10 max	Controlled to maintain ductility, forming performance and alloy cleanliness.
Sulfur	S	0.015 max	Controlled impurity affecting hot workability, surface quality and joining 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	8.91 g/cm3	0.321 lb/in3	Room temperature
Melting Point	Approx. 1280 °C	Approx. 2335 °F	Typical value
Electrical Resistivity	Approx. 0.498 µΩ·m	Approx. 294 ohm-cmil/ft	Approx. 21 °C
Temperature Coefficient of Resistance	Approx. ±20 ppm/°C	Very low resistance change with temperature	Typical controlled value
Thermal Conductivity	Approx. 21.0 W/m·°C	Approx. 133 Btu·in/ft2·h·°F	Approx. 21 °C
Modulus of Elasticity	Approx. 179 GPa	Approx. 26.0 x 10³ ksi	Room temperature
Mean Thermal Expansion	Approx. 13.7 x 10^-6/°C	Approx. 7.6 x 10^-6/°F	21-93 °C
Curie Temperature	Below -196 °C	Below -320 °F	Essentially non-magnetic at normal service temperatures

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
Hot rolled rod – annealed, typical	Approx. 441 MPa	Approx. 134 MPa	Approx. 51%	Approx. 43 HRB
Wire – annealed, typical capability	345-414 MPa	207-276 MPa	By diameter and specification	60-75 HRB
Strip and ribbon – annealed	Approx. 400-520 MPa	Approx. 115-275 MPa	30-50%	By thickness and temper
Strip and ribbon – cold worked	550-825 MPa	By temper and specification	Reduced with increasing cold work	By temper
Precision resistance wire	Adjusted to size and temper	By customer specification	By diameter	Controlled for winding and forming

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 401 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
Resistance Wire and Ribbon	ASTM B267	Round resistance wire, flat wire and precision ribbon	Electrical resistivity, temperature coefficient, dimensions and MTC
Wire	DIN 17471, ASTM B267 and customer specification	Round, flat, square, shaped and fine wire	Chemical analysis, resistivity, tensile test and dimensional inspection
Strip and Foil	ASTM B267 where applicable, DIN 17471 and customer specification	Cold rolled strip, foil, slit coil and precision ribbon	Resistivity, thickness, width, temper and surface inspection
Bar and Rod	Customer specification or drawing-based requirement	Round bar, rod, flat bar and machining stock	Chemical analysis, mechanical test, PMI and dimensional inspection
Custom Electrical Components	Customer drawing and electrical performance specification	Resistor elements, shunts, contacts, profiles and formed components	Resistance test, dimensional inspection and lot traceability
Joined Components	Qualified GTAW, resistance-welding or brazing procedure	Thin-section assemblies, contact parts and electrical subassemblies	Visual inspection, resistance test and joint inspection

Available Product Forms

Monel 401 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 diameter, wall thickness and length to drawing	Seamless or fabricated, annealed or cold worked	Special electrical assemblies, instrument components and custom conductive parts	View Pipe & Tube
Round Bar	Diameter 3-300 mm, custom cut lengths available	Hot rolled, cold drawn, annealed, ground or polished	Precision-machined terminals, contacts, shunts and instrument components	View Round Bar
Sheet & Plate	Thickness 0.2-50 mm, custom widths and lengths	Cold rolled or hot rolled, annealed or custom tempered	Electrical contact plates, shunts, laminated components and custom blanks	View Sheet & Plate
Strip & Foil	Thickness 0.01-3 mm, slit widths and coil dimensions to specification	Annealed, quarter hard, half hard, full hard or custom tempered	Precision resistors, strain gauges, bimetal contacts, shunts and measuring instruments	View Strip & Foil
Wire	Diameter 0.02-12 mm, round, flat, square or shaped profiles	Annealed, cold drawn, bare, plated, enamelled, coil or spool supplied	Wire-wound resistors, precision instruments, resistance elements and electronic controls	View Wire
Fasteners	Miniature and custom screws, nuts, studs, washers and electrical hardware	Cold formed, machined, annealed or custom tempered	Electronic instruments, terminal assemblies and corrosion-resistant electrical equipment	View Fasteners
Fittings	Custom dimensions manufactured to drawing	Formed, machined, annealed, brazed or welded	Instrument connections, sensor assemblies and specialized electrical systems	View Fittings
Flanges	Custom miniature and industrial dimensions to drawing	Cut, machined, annealed and inspected	Electrical feedthroughs, instrument housings and custom connection assemblies	View Flanges
Forgings	Discs, rings, blocks and custom electrical components to drawing	Forged, annealed, rough machined or finish machined	Special contacts, terminals, shunts and precision instrument components	View Forgings
Welding Wire	Diameter 0.5-4.0 mm, coil, spool or straight length	Clean bright finish, bare wire and controlled chemistry	Autogenous joining trials, thin-section fabrication and specialized electrical assemblies	View Welding Wire

Material Selection Guide

When to consider Monel 401

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 401 Helps	Common Product Form	Buyer Note
Stable electrical resistance over temperature	Its very low temperature coefficient minimizes resistance changes as operating temperature varies.	Fine wire, ribbon, strip and foil	Specify nominal resistivity, temperature range and permitted TCR tolerance.
Wire-wound precision resistors	Controlled resistivity, good ductility and consistent wire dimensions support accurate resistance winding.	Round wire, flat wire and enamelled wire	Confirm wire diameter, resistance per unit length, insulation and spool requirements.
Precision shunts and measuring instruments	The alloy combines stable resistance with useful formability and corrosion resistance.	Strip, ribbon, bar and machined components	Specify resistance value, current rating, temperature rise and dimensional tolerance.
Bimetal electrical contacts	Good brazing characteristics and controlled electrical properties support reliable contact assemblies.	Strip, foil, ribbon and formed contacts	Confirm the mating metal, brazing process and required contact resistance.
Non-magnetic electrical components	Its Curie temperature is below approximately -196 °C, making it essentially non-magnetic under normal conditions.	Wire, strip, bar and custom profiles	Confirm the required permeability and operating temperature with the order.
Cold-formed precision components	High ductility in the annealed condition allows drawing, rolling, stamping and forming into small electrical parts.	Wire, strip, foil and ribbon	Specify temper, bend radius, surface finish and final mechanical properties.
Brazed or resistance-welded assemblies	Alloy 401 has good brazing characteristics and can be joined effectively by resistance welding.	Strip, wire, contacts and formed components	Confirm filler metal, joint design and post-joining electrical requirements.

Why Choose Us

Supply and quality support for Monel 401

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 401 questions from buyers

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

Monel 401 is mainly used for wire-wound precision resistors, electrical shunts, bimetal contacts, measuring instruments, strain-sensitive components and specialized electrical or electronic assemblies requiring stable resistance over temperature.

Yes. UNS N04401 is the standardized UNS designation for Monel 401. Comparable electrical resistance alloy designations may include W.Nr. 2.0842 and CuNi44Mn1, subject to confirmation of the required chemistry and electrical properties.

Monel 401 contains substantially more copper and less nickel than Monel 400. It is designed primarily for controlled electrical resistance and a low temperature coefficient, while Monel 400 is more commonly selected for general marine and chemical corrosion service.

The typical electrical resistivity is approximately 0.498 µΩ·m, equivalent to about 294 ohm-cmil per foot at approximately 21 °C. Final resistance requirements should be specified for the ordered size and temper.

It combines medium electrical resistivity with a very low temperature coefficient of resistance, allowing resistor values to remain comparatively stable as temperature changes.

YSN128 can quote round wire, flat wire, shaped wire, strip, foil, ribbon, rod, bar and drawing-based components. Pipe, tube, fittings, forgings and other special forms can be discussed as project orders.

ASTM B267 is commonly used for round wire and ribbon intended for wire-wound resistance units. DIN 17471 and customer-specific electrical and dimensional requirements may also apply.

Yes. Thin sections can be autogenously welded using the gas-tungsten-arc process, and resistance welding is also suitable. The alloy has good brazing characteristics, but the joining procedure must preserve the required electrical properties.

Yes. Wire and strip can be supplied in annealed or cold-worked tempers with controlled dimensions, resistivity and resistance per unit length. Tight requirements should be agreed before production.

Please send the grade, product form, dimensions, quantity, temper, nominal resistivity or resistance per unit length, temperature coefficient tolerance, surface or coating requirement, spool or coil dimensions, certificate requirement and destination.

Monel 401