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    Monel 400 Chemical Composition - UNS N04400, Werkstoff 2.4360, DIN 17743 NiCu30Fe

    Monel 400 chemical composition (also Monel 400 material, Monel 400 material composition, composition of Monel 400, chemical composition of Monel 400, Monel metal composition, Monel chemical composition, Monel 400 alloy material) is the nickel-copper solid-solution nominal of 63 to 70 percent nickel and 28 to 34 percent copper, with iron 2.5 max, manganese 2.0 max, carbon 0.30 max, silicon 0.50 max and sulphur 0.024 max per ASTM B127, B164, B165, B564 and F468. The alloy registers as UNS N04400, Werkstoff 2.4360, DIN 17743 NiCu30Fe, BS 3076 NA13 and AFNOR NU30. Monel® is a trademark of Special Metals Corporation. The Monel 400 composition is single across all wrought forms (rod, bar, wire, plate, sheet, strip, pipe, tube, forgings, bolts, nuts); the spec number changes with the form. Free-machining Monel R-405 (UNS N04405) shares the bracket but carries sulphur at 0.025 to 0.060 percent for chip control.

    Monel 400 Chemistry per ASTM and DIN

    The Monel 400 chemistry is identical across ASTM B164 (rod, bar, wire), ASTM B127 (plate, sheet, strip), ASTM B165 (pipe, tube), ASTM B564 (forgings, flanges) and ASTM F468 (bolts). DIN 17743 NiCu30Fe (Werkstoff 2.4360) holds the same window inside a tighter carbon, iron and sulphur band. Cobalt is counted as nickel per ASTM B564 Note B.

    ElementASTM B127 / B164 / B564 / F468DIN 17743 NiCu30FeTypical
    Nickel + Cobalt63.0 - 70.063.0 min66.0
    Copper28.0 - 34.028.0 - 34.031.5
    Iron2.5 max1.0 - 2.51.5
    Manganese2.0 max2.0 max1.0
    Carbon0.30 max0.15 max0.15
    Silicon0.50 max0.50 max0.20
    Sulphur0.024 max0.020 max0.010
    Aluminium-0.50 max residual< 0.05

    The 63.0 percent nickel floor is the line below which the alloy ceases to behave as Monel 400. The 28.0 percent copper floor protects the HF and seawater corrosion envelope. The 2.5 percent iron cap is a residual ceiling, not a target.

    Role of Each Element in Monel 400

    Monel 400 is a single-phase FCC nickel-copper solid solution. Nickel and copper dissolve fully into one lattice; the minor elements act as deoxidisers or are residual from the melt. There is no chromium (and no aluminium or titanium); both omissions matter for service behaviour, the first against HF, the second against precipitation hardening.

    ElementRangeRole
    Ni63 to 70 percentFCC matrix; corrosion floor against alkalis, dilute reducing acids, seawater. Above 65 percent gives HF immunity across the alkylation band.
    Cu28 to 34 percentSolid-solution partner. Broadens resistance into seawater, brackish water, brine and crude oil.
    Fe2.5 maxResidual from the melt charge. Higher iron degrades HF and seawater performance.
    Mn2.0 maxDeoxidiser and sulphur sink (forms MnS). Widens the hot-working window above 1093 degrees Celsius.
    C0.30 maxSolid-solution strengthening. DIN 17743 tightens to 0.15 max.
    S0.024 max (Class A); 0.025 to 0.060 (Class B / R-405)Low for weldable Monel 400; raised in R-405 for free-machining MnS chip breakers.
    Si0.50 maxDeoxidiser used with manganese in melt.
    CrnoneAbsent by specification. Chromium oxide film fails in HF; the omission is the reason Monel 400 is the HF alkylation default. See HF acid resistance.
    Al, TinoneAdded only in Monel K-500 (UNS N05500) at Al 2.30 to 3.15 and Ti 0.35 to 0.85 to form Ni3(Al,Ti) precipitates during age-hardening.

    Monel 400 vs Monel R-405 vs Monel K-500 Chemistry Comparison

    The three Monel grades share the nickel-copper backbone but split on sulphur (R-405) or aluminium-titanium additions (K-500). Source: ASTM B564 Table 1 Nickel-Copper Alloys UNS N04400, N04405, N05500.

    ElementMonel 400 (N04400)Monel R-405 (N04405)Monel K-500 (N05500)
    Ni + Co63.0 - 70.063.0 - 70.063.0 - 70.0
    Cu28.0 - 34.028.0 - 34.0balance
    Fe2.5 max2.5 max2.0 max
    Mn2.0 max2.0 max1.5 max
    C0.30 max0.30 max0.25 max
    Si0.50 max0.50 max0.50 max
    S0.024 max0.025 - 0.0600.01 max
    Al--2.30 - 3.15
    Ti--0.35 - 0.85
    ConditionAnnealedAnnealedAge-hardened
    Yield (ksi)40 - 5040 - 5090 - 130

    International Equivalents and Trade Names

    The same Monel 400 chemistry is registered under nine national designations. Specify ASTM plus UNS on the purchase order to lock the chemistry; the rest are cross-references.

    SystemDesignationRegion
    Trade nameMonel 400 / Alloy 400USA
    UNSN04400International
    Werkstoff2.4360Germany
    DINDIN 17743 NiCu30FeGermany
    BSBS 3076 NA13UK
    AFNORNU30France
    JISNW4400Japan
    GOSTNMZhMts 28-2.5-1.5Russia
    ENNiCu30FeEurope

    Heat Traceability, MTC and PMI

    Every batch ships against a heat number stamped on the parent ingot, cross-referenced on the mill chemistry report. The EN 10204 type 3.1 MTC reports the actual cast analysis against the ASTM bracket; type 3.2 MTC adds independent witness verification for sour service and pressure equipment. On arrival, positive material identification (PMI) by handheld XRF or stationary OES confirms the heat: roughly 65 percent nickel, 31 percent copper, with chromium and aluminium below detection — the signature that separates Monel 400 from Monel K-500 (N05500) and Inconel 600 (N06600).

    Frequently Asked Questions

    What is Monel 400 made of? A nickel-copper solid-solution alloy of 63 to 70 percent nickel and 28 to 34 percent copper, with iron (2.5 max), manganese (2.0 max), carbon (0.30 max), silicon (0.50 max) and sulphur (0.024 max) per ASTM B164, B127, B564 and F468. UNS N04400.

    Does Monel 400 contain chromium? No. Monel 400 (UNS N04400) contains no chromium. ASTM B564 Table 1 lists chromium as not specified for N04400. Corrosion resistance comes from the nickel-copper solid solution, not from a chromium oxide film, which is why Monel 400 is specified in hydrofluoric acid service.

    Difference between Monel 400 and Monel K-500 composition? Monel 400 (N04400) is solid-solution with no Al or Ti. Monel K-500 (N05500) shares the 63 to 70 percent nickel range but adds 2.30 to 3.15 Al and 0.35 to 0.85 Ti for gamma-prime precipitation hardening. K-500 reaches 90 to 130 ksi yield; annealed Monel 400 reaches 40 to 50 ksi.

    What is UNS N04400? The Unified Numbering System designation for Monel 400. Cross-referenced to ASTM B164 (bar), B127 (plate), B165 (pipe), B564 (forgings), F467 (nuts), F468 (bolts), DIN 17743 NiCu30Fe and Werkstoff 2.4360.

    Does Monel 400 contain iron? Yes. Iron is a residual element at 2.5 percent maximum per ASTM B164, B127, B564 and F468 Table 1. Iron carries over from the melt charge.

    What is the Monel 400 carbon content? Carbon in Monel 400 is 0.30 percent maximum per ASTM B164, B127, B564 and F468 Table 1. Carbon is held low to keep the alloy weldable and to avoid carbide grain-boundary precipitation.

    Properties: mechanical properties, density, corrosion resistance, heat treatment, welding, machinability.

    Standards: ASTM B164, ASTM B127, ASTM B165, ASTM B564, ASTM F468, ASTM F467, UNS N04400, DIN 17743, Werkstoff 2.4360, NACE MR0175.

    Alloy comparison: Monel 400 vs Monel K-500, Monel vs stainless steel.

    Product forms: Monel 400 reference, fasteners, bolts, round bar, plate, sheet, tubing, seamless pipe, forging, wire, threaded rod.

    Request a Quote

    For Monel 400 material or any UNS N04400 product against a specific ASTM B164, B127, B564 or F468 chemistry brief, send drawing, quantity and certification class (EN 10204 type 3.1 or 3.2) to info@torqbolt.com or WhatsApp +91-22-66157017. Ex-Mumbai price plus heat-numbered MTC inside one working day. Domestic India 3 to 7 working days; export through JNPT.

    References

    • ASTM B127 Nickel-Copper Alloy (UNS N04400) Plate, Sheet, and Strip
    • ASTM B164 Nickel-Copper Alloy Rod, Bar, and Wire
    • ASTM B564 Nickel Alloy Forgings, Table 1, UNS N04400 Class A
    • ASTM F468 / F468M Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs
    • ASTM E1019 Carbon, Sulfur, Nitrogen, Oxygen in Steel, Iron, Nickel, Cobalt Alloys
    • ASTM E1086 Optical Emission Vacuum Spectrometric Analysis
    • ASTM E76 Chemical Analysis of Nickel-Copper Alloys (referee method)
    • DIN 17743 Wrought Nickel-Copper Alloys, NiCu30Fe, Werkstoff 2.4360
    • NACE MR0175 / ISO 15156-3 Materials for H2S-containing environments
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