Super Alloy INCONEL Alloy 603XL

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Welding
     Annealing
Applications

Introduction

INCONEL alloy 603XL is a nickel-chromium alloy with the addition of molybdenum, silicon, and rare earth elements. The key characteristics of this alloy are its resistance to elevated temperature oxidation and nitridation.

INCONEL alloy 603XL is known to be resistant to oxide spalling thus making this alloy very useful in areas where oxide contamination cannot be tolerated such as electronics, ceramics, glass, and tableware industries.

The following sections will discuss in detail about super alloy INCONEL 603XL.

Chemical Composition

The chemical composition of INCONEL alloy 603XL is outlined in the following table.

Element Content (%)
Chromium, Cr 15-23
Molybdenum, Mo 4
Silicon, Si 2
Titanium, Ti 0.5 max
Aluminum, Al 0.5 max
Manganese, Mn 0.3 max
Carbon, C 0.3 max
Rare earths 0.1 max
Nickel. Ni Remainder

Physical Properties

The physical properties of INCONEL alloy 603XL are tabulated below.

Properties Metric Imperial
Density 8.54 g/cm3 0.308 lb/in3
Melting point 1380-1400°C 2516-2552°F

Mechanical Properties

The following table shows mechanical properties of INCONEL alloy 603XL alloy.

Properties Metric Imperial
Poisson’s ratio 0.33 0.33
Elastic modulus 218.6 GPa 31.8 psi
Shear modulus 81.9 GPa 11.9 psi

Thermal Properties

The thermal properties of INCONEL alloy 603XL are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@100°C/400°F) 12.87 µm/m°C 7.46 µin/in°F
Thermal conductivity(@23°C/200°F) 11 W/mK 74.453 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Welding

Weldability of INCONEL alloy 603XL is rated as good. The commonly used welding method is the gas tungsten arc welding method. Other methods such as the electron beam can also be used. The recommended filler metal is INCONEL Filler Metal 617.

Annealing

Annealing of INCONEL 603XL can be performed by heating between 1100 and 1175°C (2012 and 2147°F) and then air cooled.

Applications

INCONEL alloy 603XL is used in the following application areas:

  • Fixtures
  • Radiant tubes
  • Furnace muffles
  • Furnace mesh belts
  • Strand annealing tubes
  • Refractory anchors.

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