Jul 25 2013
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