Jul 12 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Forging
Welding
Annealing
Cold Working
Applications
Introduction
Super alloys provide high performance at high temperatures, excellent resistance to creep, good surface stability, and good corrosion and oxidation resistance. They are highly sought by the aircraft, automobile, medical, and defense sectors.
Super alloy Ametek 936 is a controlled nickel-iron expansion alloy that has an expansion rate of about 10 % that of standard carbon steels. The following sections will discuss in detail about super alloy Ametek 936.
Chemical Composition
The chemical composition of Ametek 936 is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
36 |
|
Iron, Fe |
Remainder |
Physical Properties
The physical properties of Ametek 936 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8.11 g/cm3 |
0.293 lb/in3 |
|
Melting point |
1426°C |
2600 °F |
Mechanical Properties
The following table shows mechanical properties of Ametek 936.
|
Properties |
Metric |
Imperial |
|
Tensile strength (@20°C/68°F) |
489 MPa |
71 ksi |
|
Yield strength (@20°C/68°F) |
241 MPA |
35 ksi |
Other Designations
Equivalent materials to Ametek 936 are tabulated below:
-
ASTM B388
-
DIN 1.3912
-
MIL I-16598
-
MIL I-23011 Class 7
Fabrication and Heat Treatment
Machinability
Ametek 936 can be machined using the traditional processes. It is recommended that slow speeds with positive and constant feeds will enable smooth and easy machining.
Forming
Ametek 936 can be readily formed using all the traditional methods. The material has to be fully annealed after any forming operations to optimize on its properties.
Forging
Forging can be performed by heating the material to 1176°C (2150°F), and then cooling rapidly after working.
Welding
Welding of Ametek 936 can be performed using all the traditional welding methods. Filler metal of similar composition alloy must be used.
Annealing
Annealing can be performed at 790°C (1450°F) for 30 min for every inch thickness. This should be followed by air cooling. In case maximum dimensional stability is required, the material has to be soaked at 815 °C (1500°F) and then water quenched.
Cold Working
Ametek 936 can be easily cold worked.
Applications
Ametek 899E is used in the following application areas:
-
Electronic equipment such as radios, laser systems and thermostats
-
Metal seals in electron tubes
-
Headlights
-
Glass