Nickel Alloy 400 (UNS N04400)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Machining
     Welding
     Cold Working
     Hot Working
Other Designations
Applications

Introduction

Nickel alloy 400 is a ductile nickel-copper alloy that exhibits excellent corrosion resistance under various conditions. The alloy is frequently used in mildly oxidizing environments to moderately reducing conditions. It has high strength and toughness, and is resistant to chloride stress corrosion cracking.

The following section will discuss in detail about nickel alloy 400.

Chemical Composition

The chemical composition nickel alloy 400 is outlined in the following table.

Element Content (%)
Nickel, Ni 63-70
Copper, Cu 28-34
Iron, Fe 2.5
Manganese, Mn 2
Silicon, Si 0.5
Carbon, C 0.3
Sulfur, S 0.024

Physical Properties

The following table shows the physical properties of nickel alloy 400.

Properties Metric Imperial
Density 8.80 g/cm3 0.318 lb/in3
Melting point 1300-1350°C 2370-2460°F

Mechanical Properties

The mechanical properties of nickel alloy 400 (hot-rolled) are displayed in the following table.

Properties Metric Imperial
Tensile strength (annealed) 517-655 MPa 75-95 ksi
Yield strength (annealed) 276-517 MPa 40-75 ksi
Elongation at break (annealed) 30-45% 30-45%
Brinell hardness 125-215 125-215
Rockwell B hardness 70-96 70-96

Thermal Properties

The thermal properties of nickel alloy 400 are given in the following table

Properties Metric Imperial
Thermal conductivity 22 W/mK 150 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machining

Nickel alloy 400 can be machined at standard rates using conventional machine tools.

Welding

The alloy can be welded using conventional welding techniques such as plasma arc welding, gas metal arc welding, gas tungsten arc welding and shielded metal arc welding.

Cold Working

The alloy can be cold-worked by all cold fabrication methods.

Hot Working

Hot forming of nickel alloy 400 can be performed at temperatures 649 - 1177°C (1200-2150°F).

Other Designations

Other designations that are equivalent to nickel alloy 400 include the following:

  • ASTM B127
  • ASME SB127
  • AMS 4544
  • QQ-N-281

Applications

The following are the list of applications of nickel alloy 400:

  • Steam generators
  • Crude petroleum stills
  • Marine components
  • Chemical processing equipment
  • Water treatment plant.

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