2.4683sheet Suppliers In India

By Author: Kamal
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2.4683, also known as Alloy 188 or Haynes 188, is a cobalt-nickel-chromium-tungsten superalloy with excellent properties suitable for high-temperature applications. It demonstrates exceptional resistance to oxidizing environments up to 1095°C and offers excellent high-temperature strength, making it ideal for long-term use in demanding conditions. The alloy also boasts excellent resistance to hot corrosion, especially against sulphate deposits, molten chloride salts, and gaseous sulfidation.

Chemical Composition
Element Min (wt%) Max (wt%)
Chromium (Cr) 20.0 24.0
Nickel (Ni) 20.0 24.0
Cobalt (Co) - Balance
Tungsten (W) 13.0 16.0
Lanthanum (La) 0.02 0.12
Boron (B) - 0.015
Carbon (C) 0.05 0.15
Iron (Fe) - 3.0
Manganese (Mn) - 1.25
Silicon (Si) 0.20 0.50
Phosphorus (P) - 0.02
Sulfur (S) - 0.015
Physical Properties
Density: 9.14 g/cm³
Melting Point: 1300℃ - 1330℃
Mechanical Properties at Room Temperature
Alloy Status: Solution Treatment

Property Value
Tensile Strength (Rm) 963 N/mm²
Yield Strength ...
... (Rp0.2) 446 N/mm²
Elongation (A5) 55%
Key Properties
High-Temperature Resistance: Withstands temperatures up to 1095°C, making it suitable for high-temperature environments.
Hot Corrosion Resistance: Excellent resistance to hot corrosion by sulphate deposits and molten chloride salts.
Sulfidation Resistance: Good resistance to gaseous sulfidation.
Forming and Welding: Good ductility allows for easy forming by cold working. The alloy hardens quickly during machining, necessitating frequent intermediate annealing for complex shapes. Suitable for both manual and automatic welding methods.
Heat Treatment: Normally solution heat-treated at 1163-1191°C, followed by rapid cooling or water quenching. Annealing at lower temperatures can lead to carbide precipitation, which may affect material properties.
Applications
2.4683 / Alloy 188 / Haynes 188 is widely used in the aerospace industry and other high-temperature applications. Specific applications include:

Aerospace Industry:

Combustion boxes
Transition ducts
Afterburner components
Military and Commercial Gas Turbine Engines: Used extensively in both existing engines and new engine programs.

Fabrication and Processing
Manufacturing Techniques: Easily manufactured using conventional techniques. Due to quick work hardening during machining, frequent intermediate annealing may be required for complex shapes.
Heat Treatment: All hot or cold-worked parts must be annealed and rapidly cooled to maintain optimal properties. The standard solution heat treatment is performed at 1163-1191°C.
Welding: Compatible with both manual and automatic welding methods, ensuring versatility in fabrication.