Dec 14 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Heat Treatment
Forging
Hot Working
Cold Working
Annealing
Hardening
Applications
Introduction
Super alloys are metallic alloys that function at high temperature environment where high surface stability and deformation resistance are mainly required. Three major classification of super alloys include iron-base, nickel-base and cobalt-base alloys. Based on its application and composition, nickel-base and cobalt-base super alloys may be cast or wrought. The iron-base super alloys are generally wrought alloys having stainless steel technology. Super alloys are commonly forged, rolled to sheet or produced in various shapes. However, highly alloyed compositions are produced as castings. These alloys contain different elements in various combinations in order to achieve the desired result.
HAYNES(r) HR-120(r) alloy has good strength, oxidation resistance and excellent creep strength at elevated temperatures.
The following datasheet will provide a detailed description of HAYNES(r) HR-120(r) alloy.
Chemical Composition
The following table shows the chemical composition of HAYNES(r) HR-120(r) alloy.
|
Elements |
Content (%) |
|
Nickel, Ni |
30 - 45 |
|
Chromium, Cr |
12 - 32 |
|
Cobalt, Co |
5 |
|
Molybdenum, Mo |
5 |
|
Columbium + Tantalum (Cb + Ta) |
4 |
|
Silicon, Si |
3 |
|
Manganese, Mn |
2 |
|
Carbon, C |
0.20 |
Physical Properties
The physical properties of HAYNES(r) HR-120(r) alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
8.05 g/cm³ |
0.291 lb/in³ |
|
Melting point |
1302ºC |
2375ºF |
Mechanical Properties
The mechanical properties of HAYNES(r) HR-120(r) alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
450 MPa |
65300 psi |
|
Yield strength |
240 MPa |
34800 psi |
|
Elongation at break |
25% |
25% |
Fabrication and Heat Treatment
Machinability
HAYNES(r) HR-120(r) alloy can be machined using conventional techniques employed for iron based alloys. The quality of the alloy can be improved with the utilization of water-base coolants. Heavy duty machining tools and equipment can be used prior to cutting in order to reduce chattering or work-hardening of the alloy.
Forming
As HAYNES(r) HR-120(r) alloy has good ductility, it can be formed using all conventional methods with the help of heavy-duty lubricants.
Welding
Welding of HAYNES(r) HR-120(r) alloy is performed through commonly used welding techniques like gas tungsten arc welding, shielded metal-arc welding, metal-arc welding and submerged-arc welding. However, an alloy filler metal that suits this alloy should be used.
Heat Treatment
HAYNES(r) HR-120(r) alloy is not subjected to hardening due to heat treatment.
Forging
HAYNES(r) HR-120(r) alloy can be forged due to its ductile property.
Hot Working
Hot working of HAYNES(r) HR-120(r) alloy can be performed due to its ductile nature.
Cold Working
HAYNES(r) HR-120(r) alloy can be cold worked using standard tooling methods. As plain carbon steels cause galling, they are not preferred for forming HAYNES(r) HR-120(r) alloy. Galling can be reduced with the help of heavy duty lubricants.
Annealing
Annealing of HAYNES(r) HR-120(r) alloy can be performed at 1204ºC (2200ºF) followed by rapid cooling of air and water quenching.
Hardening
HAYNES(r) HR-120(r) alloy can be hardened by cold working.
Applications
The following are the major applications of HAYNES(r) HR-120(r) alloy:
-
Muffles
-
Heat exchangers
-
Structural members