Nov 19 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Welding
Forging
Hot Working
Cold Working
Annealing
Aging
Hardening
Applications
Introduction
Super alloys or high performance alloys contain many elements in a variety of combinations to reach a desired result. These alloys are good for use in environments with high temperatures and severe mechanical stress, and also in cases where high surface stability is needed. Super alloys provide good creep and oxidation resistance.
Strengthening of super alloys is performed by work hardening, solid-solution hardening, and precipitation hardening methods.
HAYNES(r) 25 is cobalt-based wrought alloy that is resistant to oxidation and carburization coupled with excellent high temperature strength. Even in the work hardened state, it is non-magnetic.
The following datasheet will provide more details about HAYNES(r) 25.
Chemical Composition
The following table shows the chemical composition of HAYNES(r) 25.
|
Element |
Content (%) |
|
Cobalt, Co |
49.3 |
|
Chromium, Cr |
20 |
|
Tungsten, W |
15 |
|
Nickel, Ni |
10 |
|
Iron, Fe |
3 |
|
Manganese, Mn |
1.5 |
|
Silicon, Si |
1 |
|
Carbon, C |
0.15 |
|
Sulfur, S |
0.030 |
|
Phosphorous, P |
0.040 |
Physical Properties
The physical properties of HAYNES(r) 25 are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
9.13 g/cm³ |
0.33 lb/in³ |
|
Melting point |
1382°C |
2520°F |
Other Designations
Equivalent materials to HAYNES(r) 25 are:
-
AISI 670
-
AMS 5537
-
AMS 5759
-
AMS 5796
-
ASTM F90
-
GE B50T26
-
GE B50TF1
-
MIL C-24252 Comp 1
Fabrication and Heat Treatment
Machinability
Traditional machining methods and tooling such as carbide tools or high-speed steel tools can be used for HAYNES(r) 25. However it is not suitable to use carbide tools while milling, drilling or tapping. In these cases, it is better to use only high-speed steel tools
Forming
HAYNES(r) 25 can be formed by machining, cold working, welding, and forging.
Welding
HAYNES(r) 25 is weldable using metal-arc welding, gas-tungsten arc welding, and shielded metal-arc welding. It is not suitable to use submerged-arc welding method.
The surface to be welded should be clean and free from hydrocarbon products or grease.
Forging
HAYNES(r) is basically forged in the annealed condition for optimum properties.
Hot Working
Hot working of HAYNES(r) 25 can be performed if required.
Cold Working
HAYNES(r) 25 can be cold worked using conventional tooling.
Annealing
Solution annealing of HAYNES(r) 25 can be performed in case of extreme cold working at 1204°C (2200°F) and then followed by air cooling.
Aging
Age-hardening heat treatment can be performed on HAYNES(r) 25 at 482°C (900°F) after solution annealing heat treatment is completed.
Hardening
HAYNES(r) 25 can be hardened by cold working only. If required an aging heat treatment can be performed to slightly improve hardness and strength.
Applications
HAYNES(r) 25 can be used in gas turbine high temperature components and industrial furnace applications such as liners, muffles, and structural parts.