Monel 400

High-Temp Steel

Monel 400

Nickel-copper alloy with excellent seawater corrosion resistance.

Chemical Composition (%)

NI63
CU28
FE2.5
MN2
C0.3
SI0.5

Mechanical Properties

Tensile(annealed):≥480 MPa;Yield(annealed):≥170 MPa;Elong:≥35%;Hardness:≤140 HB

Chinese Standard

ASTM B164

Equivalent Grades

UNS N04400 / DIN 2.4360 / EN 2.4360

Applications

Marine, valves, pumps, heat exchangers.

Available Forms

Bar, Rod

Uses

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.

Heat Treatment

Solution treated 1050–1250 °C and aged (≈700–900 °C) to precipitate γ′/γ″ strengtheners; processed via vacuum induction + VAR/ESR for cleanliness.

Precautions

Machining is difficult — use ceramic/PCBN tools, generous coolant and rigid setups. Keep clean (vacuum/inert melting) to avoid inclusions; avoid contamination by low-melting elements.

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