Super Alloy VLX600 (UNS N06600)

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.

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