Super Alloy Nicrofer 6020 (UNS N06625)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Forging
     Cold Working
     Annealing
Other Designations
Applications

Introduction

Nicrofer 6020 alloy is a nickel-chromium-molybdenum wrought alloy that shows excellent resistance to a variety of corrosive media. It possesses high strength at elevated temperatures, and has excellent corrosion resistance to many acids and resists intergranular attack and stress-corrosion cracking.

The following datasheet will provide an overview of nicrofer 6020 alloy.

Chemical Composition

The chemical composition of nicrofer 6020 alloy is outlined in the following table.

Element Content (%)
Chromium, Cr 20-23
Molybdenum, Mo 8-10
Iron, Fe 5
Niobium, Nb 3.15-4.15
Cobalt, Co 1
Manganese, Mn 0.5
Silicon, Si 0.5
Titanium, Ti 0.4
Aluminum, Al 0.4
Carbon, C 0.1
Phosphorus, P 0.015
Sulfur, S 0.015
Nickel, Ni Balance

Physical Properties

The following table shows the physical properties of nicrofer 6020 alloy.

Properties Metric Imperial
Density 8.44 g/cm3 0.305 lb/in3
Melting point 1290-1350°C 2350-2460°F

Mechanical Properties

The mechanical properties of nicrofer 6020 alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength (Annealed) 880 MPa 128000 psi
Yield strength (Annealed) 460 MPa 66700 psi
Elongation at break (Annealed) 50% 50%

Thermal Properties

The thermal properties of nicrofer 6020 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 12.8 µm/m°C 7.11 µin/in°F
Thermal conductivity 9.8 W/mK 68 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machinability

Nicrofer 6020 alloy can be machined by conventional means. It can be performed using rigid tooling to avoid chatter and work hardening in front of the tool edge.

Forming

Nicrofer 6020 alloy can be cold formed by conventional means and tooling to improve its strength.

Welding

The alloy can be readily welded by conventional welding techniques with the help of matching alloy filler metal.

Heat Treatment

The alloy is heat-treated at 1177°C (2150°F) and then air cooled.

Forging

The alloy can be subjected to hot forging at 1149 to 1177°C (2100 to 2150°F).

Cold Working

The alloy can be cold formed by conventional methods and tooling.

Annealing

Nicrofer 6020 alloy can be annealed at 982 to 1093°C (1800 to 2000°F) and air cooled.

Other Designations

Other designations that are equivalent to nicrofer 6020 alloy include the following:

  • AMS 5581
  • AMS 5599
  • AMS 5666
  • AMS 5837
  • AMS 5879
  • ASTM B366
  • ASTM B443
  • ASTM B444
  • ASTM B446
  • ASTM B704
  • ASTM B705
  • DIN 2.4856
  • GE B50TF133
  • MIL E-21562 (RN625)

Applications

The following are the list of applications of nicrofer 6020 alloy:

  • Chemical processing
  • Aerospace and marine engineering
  • Pollution-control equipment
  • Nuclear reactors

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