Nickel Alloy 276 (UNS N10276)

Topics Covered

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

Introduction

Nickel alloy 276 is a nickel-molybdenum-chromium-iron-tungsten alloy which is one of the most corrosion-resistant alloy available today. The high molybdenum content in its composition imparts corrosion resistance. However, the low carbon content in turn reduces carbide precipitation during welding in order to maintain resistance to intergranular attack in heat affected zones.

The following section will provide an overview of nickel alloy 276.

Chemical Composition

The chemical composition nickel alloy 276 is outlined in the following table.

Element Content (%)
Molybdenum, Mo 15-17
Chromium, Cr 14.5-16.5
Iron, Fe 4-7
Tungsten, W 3-4.5
Cobalt, Co 2.5
Manganese, Mn 1
Vanadium, V 0.35
Silicon, Si 0.08
Phosphorus, P 0.04
Sulfur, S 0.03
Carbon, C 0.01
Nickel, Ni Balance

Physical Properties

The following table shows the physical properties of nickel alloy 276.

Properties Metric Imperial
Density 8.89 g/cm3 0.321 lb/in3
Melting point 1325-1370°C 2415-2500°F

Mechanical Properties

The mechanical properties of nickel alloy 276 are displayed in the following table.

Properties Metric Imperial
Tensile strength 690 MPa 100,000 psi
Yield strength 283 MPa 41,000 psi
Elongation at break 40% 40%

Thermal Properties

The thermal properties of nickel alloy 276 are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@93°C/200°F) 12.24 µm/m°C 6.8 µin/in°F
Thermal conductivity 9.8 W/m°C 67.9 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machining

Nickel alloy 276 should be preferably machined in the annealed condition. Low cutting speeds are required to be employed as this alloy is prone to work– hardening.

Welding

Nickel alloy 276 can be readily welded using techniques such as gas tungsten arc welding, gas metal arc welding and shielded metal arc welding.

Cold Forming

The alloy 276 is cold-worked under annealed condition, as it has higher work-hardening rate than the austenitic stainless steels.

Hot Forming

The hot-working temperature of this alloy is 870 – 1230°C (1600 – 2250°F), followed by water quenching and heat treatment to ensure maximum corrosion resistance.

Other Designations

Other designations that are equivalent to nickel alloy 276 include the following:

  • ASTM B575
  • ASME SB 575

Applications

The following are the list of applications of nickel alloy 276:

  • Chemical processing equipment
  • Bleaching vessels and digesters
  • Waste treatment incinerators
  • Reactor vessels
  • Flue gas desulfurization systems
  • Oil and gas production industry

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