Jul 25 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Welding
Forging
Hot Working
Cold Working
Annealing
Applications
Introduction
Super alloy VLX600 is a general purpose structural engineering material that is designed to suit high temperature environments where strength, durability and stability are crucial. VLX600 is also known to possess excellent corrosion resistance. The following sections will discuss super alloy VLX600 in detail.
Chemical Composition
The chemical composition of super alloy VLX600 is outlined in the following table.
|
Element |
Content (%) |
|
Chromium, Cr |
14 - 17 |
|
Iron, Fe |
6-10 |
|
Manganese, Mn |
1 max |
|
Copper, Cu |
0.5 max |
|
Silicon, Si |
0.5 max |
|
Carbon, C |
0.15 max |
|
Sulfur, S |
0.015 max |
|
Nickel, Ni |
Remainder |
Physical Properties
The physical properties of super alloy VLX600 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8.4 g/cm3 |
0.306 lb/in3 |
|
Melting point |
1399°C |
2550°F |
Other Designations
Equivalent materials to super alloy VLX600 are provided below.
|
AMS 5540 |
AMS 5580 |
AMS 5665 |
AMS 5687 |
|
ASTM B166 |
ASTM B167 |
ASTM B516 |
ASTM B517 |
|
ASTM B163 |
ASTM B168 |
ASTM B564 |
DIN 2.4816 |
|
MIL N-23228 |
MIL N-23229 |
MIL N-6710 |
MIL T-23227 |
|
QQ W390 |
|
|
|
Fabrication and Heat Treatment
Machinability
Super alloy VLX600 can be machined using the common processes applied to iron based alloys. This alloy does work-harden during machining and displays higher strength and "gumminess" unlike steels. It is recommended that heavy duty machining equipment and tooling should be used to reduce chatter or work-hardening of the alloy.
Any commercial coolants can be used during the machining operations; however water-based coolants are recommended for high-speed operations such as milling, turning, or grinding. Similarly, heavy lubricants are ideal for tapping, broaching, drilling, or boring.
Forming
Super alloy VLX600 can be formed using any of the conventional methods as it is very ductile. Powerful equipment is required to perform forming operations as this alloy is strong. It is recommended that heavy-duty lubricants be used while performing cold forming. It is important to clean all traces of lubricant after forming.
Welding
Welding of super alloy VLX600 can be performed using all the traditional welding methods. Matching alloy filler metal should be used. In case that is not available, it is advised that the nearest alloy closest to the chemical composition be used. The weld beads should be slightly convex, and preheating is not required. Surfaces to be welded have to be clean and free from oil, paint or crayon marking.
Forging
Forging should be performed in the temperature range of 1232-1037°C (2250-1900°F).
Hot Working
Hot working can be performed in the temperature range of 1232-871°C (2250-1600°F). Super alloy VLX600 has low ductility in the temperature range of 649-871°C (1200-1600°F) and hence working in that temperature range should be avoided.
Cold Working
Super alloy VLX600 can be cold formed using all the standard tools.
Annealing
Super alloy VLX600 can be solution annealed at 1010°C (1850°F) for 15 min and then air cooled.
Applications
Super alloy VLX600 is used in many application areas as listed below:
-
Heaters
-
Heat exchangers
-
Chemical process equipment
-
Heat treatment furnace components
-
Fixtures and gas turbine components.