Nov 16 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Welding
Heat Treatment
Forging
Hot Working
Cold Working
Annealing
Hardening
Applications
Introduction
Super alloys have good creep and oxidation resistance. They are formed in different shapes, and consist of number of elements in a variety of combinations to achieve the desired result. They have the capacity to function at very high temperatures and severe mechanical stress, and also where high surface stability is required.
Nicrofer 7520 Ti™ is a nickel-chromium alloy. It is added with aluminum and titanium to increase its strength. The following datasheet will discuss about Nicrofer 7520 Ti™ .
Chemical Composition
The chemical composition of Nicrofer 7520 Ti™ is outlined in the following table.
|
Elements |
Content (%) |
|
Chromium, Cr |
18-21 |
|
Iron. Fe |
3 max |
|
Titanium, Ti |
1.8-2.7 |
|
Aluminum, Al |
1-1.8 |
|
Manganese, Mn |
1 max |
|
Silicon, Si |
1 max |
|
Phosphorus, P |
0.045 max |
|
Cobalt. Co |
0.2 max |
|
Copper, Cu |
0.2 max |
|
Carbon, C |
0.1 max |
|
Sulfur, S |
0.015 max |
|
Boron, B |
0.008 max |
|
Nickel, Ni |
Remainder |
Physical Properties
The physical properties of Nicrofer 7520 Ti™ are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
8.1 g/cm³ |
0.295 lb/in³ |
|
Melting point |
1343°C |
2450°F |
Other Designations
Other designations that are equivalent to Nicrofer 7520 Ti™ include:
-
ASTM B637
-
DIN 2.4631
-
DIN 2.4952
Fabrication and Heat Treatment
Machinability
Nicrofer 7520 Ti™ can be machined using conventional techniques which are used for iron-based alloys. Machining operations are performed using commercial coolants. High-speed operations such as grinding, milling, or turning, are performed using water-based coolants. Heavy lubricants are used for tapping, drilling, boring or broaching.
Forming
Nicrofer 7520 Ti™ can be formed using all conventional techniques.
Welding
Nicrofer 7520 Ti™ is welded using shielded metal-arc welding, gas-tungsten arc welding, gas metal-arc welding, and submerged-arc welding methods.
Heat Treatment
Nicrofer 7520 Ti™ is heat treated by annealing at 1080°C (1975°F) for 8 h followed by cooling.
Forging
Nicrofer 7520 Ti™ is forged at 983 to 1177°C (1800 to 2150°F).
Hot Working
Nicrofer 7520 Ti™ is hot worked at 983 to 1177°C (1800 to 2150°F).
Cold Working
Nicrofer 7520 Ti™ can be cold worked using standard tooling.
Annealing
Nicrofer 7520 Ti™ is annealed at 1080°C (1975°F) for 8 h followed by
Hardening
Nicrofer 7520 Ti™ is hardened by cold working.
Applications
Nicrofer 7520 Ti™ is used in gas turbine hot section components.