Jul 25 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Welding
Forging
Cold Working
Annealing
Aging
Applications
Introduction
Super alloy Pyrotool A is an iron based high temperature, high strength alloy. It is also a type of austenitic precipitation hardenable alloy. It has good ductility at temperatures up to 649°C (1200°F).
Pyrotool A provides medium strength and oxidation resistance at reasonably low cost and at temperatures that are greater than that of stainless steels. The following sections will discuss in detail about super alloy Pyrotool A.
Chemical Composition
The chemical composition of Pyrotool A is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
25 |
|
Chromium, Cr |
14.5 |
|
Titanium, Ti |
2.2 |
|
Molybdenum, Mo |
1.5 |
|
Manganese, Mn |
1.2 |
|
Silicon, Si |
0.5 |
|
Carbon, C |
0.04 |
|
Iron, Fe |
Remainder |
Physical Properties
The physical properties of Pyrotool A are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
7.9 g/cm3 |
0.286 lb/in3 |
|
Melting point |
1399°C |
2550°F |
Other Designations
Equivalent materials to Pyrotool A are provided below.
|
AMS 5525 |
AMS 5858 |
GE B50T1181 |
GE B50T12 |
|
AMS 5732 |
AMS 5804 |
DIN 1.4944 |
GE B50T81 |
|
AMS 5731 |
AMS 5853 |
DIN 1.4943 |
SPS M250 |
|
AISI 662 |
AMS 5805 |
ASTM A638 Grade 660 |
|
|
AMS 5726 |
AMS 5737 |
ASTM A453 Grade 660 |
|
|
AISI 660 |
AMS 5734 |
AMS 5895 |
|
Fabrication and Heat Treatment
Machinability
Super alloy Pyrotool A can be machined using all the common processes. Cemented carbide tools are recommended for use during turning operations.
Forming
Super alloy Pyrotool A can be cold and hot formed using any of the conventional methods.
Welding
Welding processes of super alloy Pyrotool A are similar to that of stainless steels. The area to be welded has to be properly cleaned. Preheating or post welding heat treatment is not required.
Forging
Light forging can be performed in the temperature range of 871-1010°C (1600-1850°F). Heavy forging can be done in the temperature range of 1010-1204°C (1850-2200°F).
Cold Working
Pyrotool A can be cold formed.
Annealing
Pyrotool A can be solution annealed at 982°C (1800°F) and oil quenched, which should be followed by holding at 718°C (1325°F) for 16 h and air cooling. This treatment enhances high strength for the alloy.
Aging
This super alloy can be aged at 718°C (1325°F) for 16 h and air cooled to gain high strength. Prior to aging the alloy should solution heat treated.
Applications
Super alloy Pyrotool A is used in many application areas as listed below:
-
Rings
-
Liners
-
Holders
-
Mandrels
-
Forging dies
-
Dummy blocks
-
Extrusion dies
-
High-temperature tooling.