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Nickel Alloy Grade Data Sheet

Monel 400

Monel 400 is commonly specified when a combination of strength, toughness and corrosion resistance is required in seawater, steam, salt solutions, caustic media and selected reducing acids. The alloy retains useful mechanical properties over a wide temperature range and remains tough at very low temperatures. It is supplied in plate, sheet, strip, bar, pipe, tube, wire, forging and fitting forms for marine equipment, chemical processing systems, pumps, valves, heat exchangers, pressure vessels, shafts, fasteners and industrial piping.

 

 

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Material Overview

Monel 400 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 400 is commonly specified when a combination of strength, toughness and corrosion resistance is required in seawater, steam, salt solutions, caustic media and selected reducing acids. The alloy retains useful mechanical properties over a wide temperature range and remains tough at very low temperatures. It is supplied in plate, sheet, strip, bar, pipe, tube, wire, forging and fitting forms for marine equipment, chemical processing systems, pumps, valves, heat exchangers, pressure vessels, shafts, fasteners and industrial piping.

 

 

Monel 400

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 400 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 400
Nickel plus Cobalt Ni + Co 63.0 min Forms the corrosion-resistant matrix and provides toughness, ductility and resistance to stress corrosion cracking.
Copper Cu 28.0-34.0 Provides resistance to seawater, reducing acids, salt solutions and many industrial chemicals.
Iron Fe 2.5 max Contributes to strength and helps balance the nickel-copper solid-solution matrix.
Manganese Mn 2.0 max Supports solid-solution strengthening and assists deoxidation during melting.
Carbon C 0.30 max Controlled to maintain ductility, toughness and fabrication performance.
Silicon Si 0.50 max Controlled minor element used for deoxidation and metallurgical processing.
Sulfur S 0.024 max Controlled impurity affecting hot workability, weldability and surface quality.

 

 

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. 7.7 x 10-6/°F 21-100 °C
Poisson’s Ratio Approx. 0.32 Dimensionless Room temperature
Curie Temperature 21-49 °C 70-120 °F Magnetic response varies with composition and temperature

 

 

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 517-620 MPa 172-345 MPa 35-60% 110-149 HB / 60-80 HRB
Plate – hot rolled and annealed 482-586 MPa 193-345 MPa 35-50% 110-140 HB / 60-76 HRB
Sheet – annealed 482-586 MPa 207-310 MPa 35-45% 65-80 HRB
Strip – cold rolled and annealed 482-586 MPa 172-310 MPa 35-55% 68 HRB max
Seamless pipe and tube – cold drawn and annealed 482-586 MPa 172-310 MPa 35-50% 75 HRB max
Wire – cold drawn and annealed 482-655 MPa 207-379 MPa 25-45% By diameter and specification
Wire – full hard or spring temper 1000-1241 MPa 862-1172 MPa 2-5% By diameter and 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 400 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
Plate, Sheet and Strip ASTM B127 / ASME SB127, AMS 4544, DIN 17750 Hot rolled plate, cold rolled sheet, strip, coil and cut blanks EN10204 3.1, chemical analysis and mechanical test
Rod, Bar and Wire ASTM B164 / ASME SB164, AMS 4675, AMS 4730, AMS 4731, DIN 17752, DIN 17753 Round bar, rod, flat bar, hexagonal bar, wire and ribbon MTC, PMI, dimensional inspection and mechanical test
Seamless Pipe and Tube ASTM B165 / ASME SB165, ASTM B163 / ASME SB163, AMS 4574, DIN 17751 Seamless pipe, process tube and condenser or heat exchanger tube Hydrostatic test, eddy current test, PMI and MTC
Welded Pipe ASTM B725 / ASME SB725, ASTM B775 / ASME SB775 Longitudinally welded pipe and large-diameter fabricated pipe Radiographic or penetrant testing, hydrotest and MTC
Welded Tube ASTM B730 / ASME SB730, ASTM B751 / ASME SB751 Welded process tube, heat exchanger tube and condenser tube Eddy current, hydrostatic or pneumatic testing and MTC
Forgings and Flanges ASTM B564 / ASME SB564, AMS 4675, DIN 17754 Rings, discs, blocks, shafts and forged flanges Heat-treatment record, UT, PMI and dimensional inspection
Fittings ASTM B366 / ASME SB366 Elbows, tees, reducers, caps and drawing-based fittings PMI, dimensional inspection, NDT and MTC
Welding Products AWS A5.14 ERNiCu-7, AWS A5.11 ENiCu-7 Matching welding wire, welding rod and covered electrodes Mill certificate, controlled chemistry and dimensional inspection

 

 

Available Product Forms

Monel 400 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 OD 6-1219 mm, wall thickness or schedule to specification Seamless or welded, annealed, stress relieved, descaled and pickled Seawater systems, chemical piping, heat exchangers, condensers and feedwater heaters View Pipe & Tube
Round Bar Diameter 3-600 mm, custom cut lengths available Hot finished, cold drawn, annealed, stress relieved, ground or polished Pump shafts, propeller shafts, valve stems, fasteners and machined components View Round Bar
Sheet & Plate Thickness 0.5-100 mm, custom widths and lengths Hot rolled or cold rolled, annealed, descaled, pickled or polished Process vessels, tanks, heat exchangers, marine equipment and industrial liners View Sheet & Plate
Strip & Foil Thickness 0.02-3 mm, slit widths and coil dimensions to specification Annealed, quarter hard, half hard, full hard or spring temper Springs, diaphragms, electrical components, seals and precision formed parts View Strip & Foil
Wire Diameter 0.1-12 mm, coil, spool or straight-length supply Annealed, cold drawn, spring temper, bright or pickled Springs, mesh, marine fasteners, electrical components and welding-product manufacture View Wire
Fasteners Standard and custom bolts, nuts, screws, studs and washers from M3 to M100 Cold formed, machined, rolled thread, annealed or custom finished Marine equipment, chemical plants, pumps, valves and seawater systems View Fasteners
Fittings NPS 1/2-48 in, ASME, EN and custom drawing dimensions Seamless, welded or fabricated, annealed, pickled and machined Seawater piping, chemical process lines, heat exchangers and industrial fluid systems View Fittings
Flanges NPS 1/2-48 in, ASME B16.5, ASME B16.47, EN or custom specifications Forged or cut from plate, annealed, machined and inspected Marine piping, process vessels, valves, pumps and chemical-transfer systems View Flanges
Forgings Rings, discs, blocks, shafts and drawing-based components to project dimensions Forged, annealed, rough machined or finish machined Propeller shafts, pump parts, valve bodies, pressure components and marine hardware View Forgings
Welding Wire Diameter 0.8-4.0 mm, spool, coil or straight welding rod Clean bright finish, precision drawn and controlled chemistry Joining Monel 400, dissimilar-metal welding, repair and corrosion-resistant overlay View Welding Wire

 

 

Material Selection Guide

When to consider Monel 400

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 400 Helps Common Product Form Buyer Note
Seawater and marine service The nickel-copper composition provides excellent resistance to flowing seawater and many marine environments. Pipe, tube, bar, fasteners, forgings and fittings Confirm water velocity, aeration, temperature, deposits and galvanic contact.
Caustic and alkaline solutions Alloy 400 provides useful resistance to many caustic soda and alkaline process conditions. Plate, pipe, tube, valves and pump components Check concentration, temperature and the presence of oxidizing contaminants.
Deaerated hydrochloric and hydrofluoric acid The alloy performs well in selected reducing-acid conditions when oxygen and oxidizing salts are controlled. Pipe, tube, plate, fittings and valve parts Confirm aeration, acid concentration, temperature and impurities.
Steam and boiler feedwater equipment Good corrosion resistance, thermal conductivity and mechanical strength support long-term service. Tube, pipe, plate, fittings and heat-exchanger components Specify pressure, temperature, water chemistry and inspection requirements.
Low-temperature service Alloy 400 retains excellent toughness and does not undergo a conventional ductile-to-brittle transition at cryogenic temperatures. Plate, bar, pipe, tube and forgings Confirm the design code, impact-testing requirement and minimum temperature.
Pump, valve and shaft components The alloy combines corrosion resistance, toughness and useful strength with good fabrication capability. Round bar, forgings, fasteners and machined components Specify fluid chemistry, mechanical load, tolerance and surface finish.
Cold-worked high-strength components Monel 400 can be strengthened substantially by cold working without precipitation heat treatment. Wire, strip, sheet, bar and tube Specify temper, tensile strength, hardness and forming requirements.

 

 

Why Choose Us

Supply and quality support for Monel 400

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 400 questions from buyers

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

Monel 400 is used for marine equipment, seawater piping, pumps, valves, propeller and pump shafts, heat exchangers, boiler feedwater heaters, chemical-processing equipment, pressure vessels, tanks, springs, fasteners and electrical components.

Yes. UNS N04400 is the standardized UNS designation for Monel 400. The alloy may also be identified as Alloy 400, Nickel Alloy 400, W.Nr. 2.4360, W.Nr. 2.4361 or NiCu30Fe.

Yes. Monel 400 provides excellent resistance to many flowing seawater and marine environments. Water velocity, aeration, deposits, crevices and galvanic contact should still be considered during material selection.

Monel 400 performs well in selected hydrochloric and hydrofluoric acid environments, particularly under reducing or deaerated conditions. Oxidizing contaminants and aeration can significantly affect corrosion performance.

Monel R-405 is the free-machining version of Monel 400. R-405 contains controlled additional sulfur for improved chip breaking, while Monel 400 is preferred for broader fabrication, forming and forging applications.

YSN128 can quote plate, sheet, strip, round bar, rod, wire, seamless or welded pipe and tube, forgings, flanges, fittings, fasteners and matching welding products. Custom cutting, machining allowance and drawing-based supply can be discussed.

Common standards include ASTM B127 for plate, sheet and strip, ASTM B164 for rod, bar and wire, ASTM B165 for seamless pipe and tube, ASTM B163 for heat exchanger tube, ASTM B725 for welded pipe, ASTM B730 for welded tube, ASTM B564 for forgings and ASTM B366 for fittings.

Yes. Monel 400 can be welded using conventional nickel-alloy procedures. Common matching welding products include AWS A5.14 ERNiCu-7 filler wire and AWS A5.11 ENiCu-7 covered electrodes.

Yes. EN10204 3.1 material certificates can be supplied on request, including heat number, chemical composition, mechanical properties, heat-treatment condition and applicable inspection results.

Please send the grade or UNS number, product form, dimensions, quantity, applicable standard, delivery condition, temper, certificate requirements, destination and service conditions. Drawings and additional inspection requirements are also welcome.

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