Alloy 400

Introduction

MONEL nickel alloy is a solid solution alloy that can be hardened by the process of cold working. MONEL is a trademark of Special Metals Corporation under which a series of nickel-copper alloys are grouped. Commercially there are many types of MONEL available, such as alloy 400, alloy 401, alloy R-405, Alloy K-500 and Monel 404. The Alloy 400 alloy is also known as super alloy monel. This alloy is available in some standard shapes such as hexagon, round, tube, pipe, plate, strip, sheet and wire. The proportions of copper and nickel used to make monel are the same as that found in the nickel ore found in Ontario mines. This alloy exhibits good corrosion resistance. This datasheet will look into the chemical composition, properties and applications of Alloy 400 alloy.

Equivalent Grades Of Alloy 255

Zeon Grade Alloy Name UNS EN / DIN / W Nr. Trademarks
Zeon400 Alloy 400 UNS N04400 2.4360/2.4361 Monel 400

Chemical Composition Of Alloy 400

Element Content (%)
Nickel, Ni Remainder
Copper, Cu 28-34
Iron, Fe 2.5 max
Manganese, Mn 2 max
Silicon, Si 0.5 max
Carbon, C 0.3 max
Sulphur, S 0.024

Physical Properties Of Alloy 400

Properties Metric Imperial
Density 8.8 gm/cm3 0.318 lb/in3

Mechanical Properties Of Alloy 400

Properties Metric Imperial
Tensile strength(annealed) 517-620 MPa 75-90 ksi
Yield strength 172-345 MPa 25-50 ksi
Modulus of elasticity 179 GPa 26000 ksi
Poisson’s ratio 0.32 0.32

Processing Alloy 400

Machinability The machinability of MONEL 400 is difficult as it work-hardens during machining. The conventional machining techniques used on iron alloys may be used for this alloy.
Welding: Welding methods including gas-arc welding, metal-arc welding, gas-metal-arc welding and submerged-arc welding are recommended on this alloy.
Forging Forging of this alloy is to be done by controlled procedures.
Hot Working Hot working on this alloy needs to be done by choosing proper temperatures. Typical temperatures for hot working range between 648-1176°C (1200-2150°F).
Cold Working Cold working may be done using soft die materials for better finishing.
Annealing Inconel X-750 alloy is annealed at 983 to 1038°C (1800 to 2000°F) followed by cooling.
Applications 1. Marine fixtures, pumps, valves and piping systems for sea water applications. 2. Chemical plant equipment. 3. Frames for eyeglasses. 4. Aerospace applications. 5. Musical instruments.