Jul 30 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Heat Treatment
Forging
Hot Working
Cold Working
Other Designations
Applications
Introduction
Nicrofer 7216 LC alloy is a special low-carbon steel that is characterized by excellent resistance to intergranular corrosion, virtual immunity to chloride-ion stress-corrosion cracking and good resistance to high-temperature corrosion in the presence of dry chlorine and hydrogen chloride.
The following datasheet will explain in detail about nicrofer 7216 LC alloy.
Chemical Composition
The chemical composition of nicrofer 7216 LC alloy is outlined in the following table.
|
Element |
Content (%) |
|
Chromium, Cr |
14-17 |
|
Iron, Fe |
6-10 |
|
Manganese, Mn |
1 |
|
Silicon, Si |
0.5 |
|
Copper, Cu |
0.5 |
|
Carbon, C |
0.15 |
|
Sulfur, S |
0.015 |
|
Nickel, Ni |
Balance |
Physical Properties
The following table shows the physical properties of nicrofer 7216 LC alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.4 g/cm3 |
0.30 lb/in3 |
|
Melting point |
1370-1425°C |
2500-2600°F |
Mechanical Properties
The mechanical properties of nicrofer 7216 LC alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (Annealed) |
550 MPa |
80 ksi |
|
Yield strength (0.2% Annealed) |
180 MPa |
26.1 ksi |
|
Elongation at break (Annealed) |
30% |
30% |
|
Brinell hardness |
≤195 |
≤195 |
Thermal Properties
The thermal properties of nicrofer 7216 LC alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@100°C /212°F) |
13.7 µm/m°C |
7.6 µin/in°F |
|
Thermal conductivity (@20°C/68°F) |
14.8 W/mK |
103 BTU.in/hrft².°F |
Fabrication and Heat Treatment
Machinability
Conventional machining techniques that are used for machining iron-based alloys can be used.
Forming
Nicrofer 7216 LC alloy has excellent ductility, and can be readily formed by all conventional techniques.
Welding
The alloy can be welded using commonly used welding techniques such as gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding and submerged-arc welding.
Heat Treatment
The alloy is heat-treated at 1010°C (1850°F) and air cooled.
Forging
Forging of nicrofer 7216 LC alloy can be done at the temperature range of 1038 to 1232°C (1900 to 2250°F).
Hot Working
The alloy is hot-worked at 871 to 1232°C (1600 to 2250°F).
Cold Working
Cold working of the alloy can be performed using standard tooling.
Other Designations
Other designations that are equivalent to nicrofer 7216 LC alloy include the following:
|
AMS 5540 |
ASTM B167 |
MIL N-23228 |
|
AMS 5580 |
ASTM B168 |
MIL N-23229 |
|
AMS 5665 |
ASTM B516 |
MIL N-6710 |
|
AMS 5687 |
ASTM B517 |
MIL T-23227 |
|
ASTM B163 |
ASTM B564 |
QQ W390 |
ASTM B166
|
DIN 2.4816
|
|
Applications
The following are the list of applications of nicrofer 7216 LC alloy:
-
Heaters and heat exchangers
-
Heat treat furnace components
-
Chemical process equipment
-
Gas turbine components
-
Fixtures