Nickel Alloy 925 / Incoloy 925® Product Introduction
Nickel Alloy 925, commercially known as Incoloy 925®, is a nickel-iron-chromium alloy designed for high-strength applications in various industries. This article provides a comprehensive introduction to its chemical composition, mechanical properties, performance characteristics, industrial applications, shapes, sizes, production standards, international grades, welding considerations, processing methods, polishing techniques, heat treatment specifics, cold working capabilities, as well as an assessment of its advantages, disadvantages, and comparison with similar products.
Chemical Composition
The chemical composition of Nickel Alloy 925 is crucial for understanding its properties and suitability for specific applications. Below is a table detailing its composition:
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 42.0 – 46.0 |
| Iron (Fe) | 22.0 min |
| Chromium (Cr) | 19.5 – 22.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 1.9 – 2.4 |
| Aluminum (Al) | 0.1 – 0.5 |
| Silicon (Si) | 0.1 max |
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 0.01 max |
| Sulfur (S) | 0.01 max |
| Phosphorus (P) | 0.01 max |
Mechanical Properties
Nickel Alloy 925 exhibits excellent mechanical properties suitable for demanding environments. The following table outlines its typical mechanical properties:
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 810 min |
| Yield Strength (0.2% offset) (MPa) | 550 min |
| Elongation (%) | 30 min |
| Hardness (HV) | 255 max |
Performance at Different Temperatures
The performance of Nickel Alloy 925 varies with temperature, making it versatile for both high and low-temperature applications. Here are its typical characteristics:
| Temperature Range (°C) | Performance |
|---|---|
| Room Temperature | Excellent strength and ductility |
| Elevated Temperatures | Retains high strength and oxidation resistance |
| Cryogenic Temperatures | Maintains toughness and ductility |
Industry Applications
Nickel Alloy 925 finds extensive use in various industries due to its robust properties. Applications include:
- Oil and Gas: Downhole and surface applications, including wellhead components and valves.
- Aerospace: Engine components, landing gear, and structural parts.
- Chemical Processing: Equipment for corrosive environments.
- Marine: High-strength fasteners and fittings.
Shape, Size, and Production Standards
Nickel Alloy 925 is available in various forms such as round bars, sheets, plates, and pipes. Sizes range from small components to large structural parts. It conforms to industry standards such as ASTM B805 and AMS 5661.
Standards and Corresponding Grades
The alloy complies with international standards and has equivalent grades across different countries, ensuring global compatibility and availability.
Welding, Processing, Polishing, Heat Treatment, Cold Processing
| Process | Details |
|---|---|
| Welding | Weldable using conventional methods; preheating and post-weld heat treatment may be necessary. |
| Machining | Requires sharp tools and adequate cooling to minimize work hardening. |
| Polishing | Achieves a smooth finish suitable for aesthetic and corrosion resistance enhancement. |
| Heat Treatment | Annealing at specific temperatures enhances ductility and stress relief. |
| Cold Working | Cold drawing or rolling improves strength and dimensional accuracy. |
Advantages and Disadvantages
| Advantages | Disadvantages |
|---|---|
| High strength and toughness | Higher cost compared to standard stainless steels |
| Excellent corrosion resistance | Requires skilled handling during fabrication |
| Wide range of applications | Limited availability in some regions |
| Good weldability and machinability |
Similar Products
Comparable alloys include Inconel 718 and Hastelloy C-276, offering similar properties for specific applications.
Conclusion
Nickel Alloy 925 / Incoloy 925® combines high strength, excellent corrosion resistance, and versatile performance across diverse industrial applications. Its chemical composition, mechanical properties, and standards ensure reliability in demanding environments, making it a preferred choice for critical components in aerospace, oil and gas, and chemical processing sectors.
For further detailed specifications and applications, consulting technical datasheets and manufacturer guidelines is recommended.