Jul 9 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Forging
Hot Working
Cold Working
Annealing
Other Designations
Applications
Introduction
Pyromet 601 alloy is a nickel-chromium-iron alloy that has excellent oxidation resistance at high temperatures. It also possesses high temperature strength and corrosion resistance, which makes it suitable for applications where heat and corrosion resistance are the primary considerations.
The following section will discuss in detail about Pyromet 601 alloy.
Chemical Composition
The chemical composition of Pyromet 601 alloy is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
58 - 63 |
|
Chromium, Cr |
21-25 |
|
Aluminum, Al |
1-1.7 |
|
Manganese, Mn |
1 |
|
Copper, Cu |
1 |
|
Silicon, Si |
0.5 |
|
Carbon, C |
0.1 |
|
Sulfur, S |
0.015 |
Physical Properties
The following table shows the physical properties of Pyromet 601 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.11 g/cm3 |
0.293 lb/in3 |
|
Melting point |
1349°C |
2460°F |
Mechanical Properties
The mechanical properties of Pyromet 601 alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (Solution annealed) |
760 MPa |
110000 psi |
|
Yield strength (Solution annealed) |
450 MPa |
65300 psi |
|
Elongation at break (Solution annealed) |
42% |
42% |
Thermal Properties
The thermal properties of Pyromet 601 alloy are given in the following table
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
13.75 µm/m°C |
7.639 µin/in°F |
|
Thermal conductivity |
11.2 W/mK |
77.7 BTU.in/hrft².°F |
Fabrication and Heat Treatment
Machinability
Pyromet 601 alloy can be machined by all conventional machining techniques. The alloy tends to work-harden during machining.
Forming
The alloy can be readily formed by all conventional methods. It is necessary to clear all traces of lubricant after forming as embrittlement of the alloy may occur at high temperatures.
Welding
Pyromet 601 alloy can be welded using conventional welding techniques such as gas-tungsten arc welding, shielded metal-arc welding and submerged arc welding.
Forging
Forging of Pyromet 601 alloy can be carried out at temperatures from 1038 to 1232°C (1900 to 2250°F).
Hot Working
The alloy is hot worked at temperatures from 871 to 1232°C (1600 to 2250°F).
Cold Working
The alloy can be cold worked using standard tooling.
Annealing
Annealing of Pyromet 601 alloy is performed at 1149°C (2100°F) followed by rapid cooling to avoid thermal cracking.
Other Designations
Other designations that are equivalent to Pyromet 601 alloy include the following:
-
DIN 2.4851
-
ASTM B166
-
ASTM B167
-
ASTM B168
-
AMS 5715
-
AMS 5870
Applications
The following are the list of applications of Pyromet 601 alloy:
-
Annealing tubes
-
Flame shields
-
Muffles
-
Combustor components
-
Condenser tubes
-
Process heaters.