Jul 25 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
Hardening
Applications
Introduction
Pyromet CTX-909 alloy is a high-strength, precipitation hardenable superalloy that exhibits a low and relatively constant thermal expansion coefficient over a wide temperature range, good thermal fatigue resistance and high hot hardness. It offers excellent combination of tensile properties and stress rupture strength under the recrystallized condition.
The following datasheet will provide an overview of Pyromet CTX-909 alloy.
Chemical Composition
The chemical composition of Pyromet CTX-909 alloy is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
35 - 40 |
|
Cobalt, Co |
12-16 |
|
Niobium, Nb |
4.3 - 5.2 |
|
Chromium, Cr |
1 |
|
Manganese, Mn |
1 |
|
Copper, Cu |
0.5 |
|
Phosphorus, P |
0.015 |
|
Sulfur, S |
0.015 |
|
Boron, B |
0.012 |
|
Iron, F |
Balance |
Physical Properties
The following table shows the physical properties of Pyromet CTX-909 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.276 g/cm3 |
0.299 lb/in3 |
|
Melting point |
1370-1400°C |
743-760°F |
Mechanical Properties
The mechanical properties of Pyromet CTX-909 alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1158 MPa |
167954 psi |
|
Yield strength |
1034 MPa |
149969 psi |
|
Elongation at break |
15% |
42% |
Thermal Properties
The thermal properties of Pyromet CTX-909 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@25-93°C/77-200°F) |
8.1 µm/m°C |
4.5 µin/in°F |
|
Thermal conductivity |
16 W/mK |
110.93 BTU.in/hrft².°F |
Fabrication and Heat Treatment
Machinability
Conventional machining techniques that are used for machining iron-based alloys can be used.
Forming
Pyromet CTX-909 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 982°C (1800°F) and air cooled.
Forging
Forging of Pyromet CTX-909 alloy can be done at the temperature range of 1060 to 1121°C (1940 to 2050°F).
Hot Working
The alloy is hot-worked at 982 to 1038°C (1800 to 1900°F) and then air cooled.
Cold Working
Cold working of the alloy can be performed using standard tooling.
Hardening
Pyromet CTX-909 alloy can be hardened using cold working.
Applications
The following are the list of applications of Pyromet CTX-909 alloy:
-
Gas turbine shrouds
-
High temperature bolting
-
Gauge blocks.