MONEL 400

Monel 400 Ni-Cu Corrosion-Resistant Bar

Proven Ni-Cu alloy for seawater, HF acid and alkalis

Ni-Cu solid-solution alloy resisting seawater, HF acid and alkalis; immune to chloride stress-corrosion cracking and non-magnetic (≤10 CGS) — a classic choice for seawater shaft parts and chemical equipment.

Technical Data

Material category: Ni-Cu Solid-Solution Corrosion-Resistant Alloy
Specification: ASTM B164-03
Delivery condition: Annealed + Cold Drawn
UNS: N04400
W.Nr.: 2.4360
Specification: Monel 400 / UNS N04400

Mechanical Properties

Tensile Rm	≥ 600 MPa
Yield Rp0.2	≥ 345 MPa
Elongation A	≥ 20 %
Reduction of Area	—
Hardness	HRB 87 ~ HRC 23
Service Temp.	-100 ~ 480 °C
Density	8.83 g/cm³
Condition	Annealed + Cold Drawn

Chemical Composition

Values in wt%, balance is the base element.

Nickel Ni	≥ 63.0
Copper Cu	28.0 – 34.0
Iron Fe	≤ 2.5
Manganese Mn	≤ 2.0
Carbon C	≤ 0.30
Silicon Si	≤ 0.50
Sulfur S	≤ 0.024

Technical Data

Tensile strength Rm: 600 MPa
Yield strength Rp0.2: 345 MPa
Elongation A: 20 %
Reduction of area Z: — %
Hardness: HRB 87 ~ HRC 23
Service temperature: -100 ~ 480 ℃
Density: 8.83 g/cm³

Material Characteristics

Ni-Cu solid-solution alloy; resists seawater, HF acid and alkalis; chloride-SCC immune and non-magnetic
Cu 28.0-34.0% with Ni ≥63.0% balances corrosion resistance and cold formability; C ≤0.30% avoids grain-boundary carbides
Cold-drawn yield far above the annealed condition (Rp0.2 495-610 MPa measured, heat SH20260801)
Excellent ductility and weldability when annealed; cold-drawn bar, rough-machined blanks and finished shafts

Typical Applications

Seawater shaft partsChemical heat exchangeMarine partsHF acid and alkali service

Inspection & Certification

UT to ASTM A388/A388M-2023, acceptance class AMS-STD-2154E, 0.8 mm FBH sensitivity (immersion line-focus probe); surface and dimensional inspection before release; EN 10204 3.1 certificate (3.2 available) with each lot. Magnetic field strength is also tested per report (≤10 CGS).