ASTM B161 UNS N02200 UNS N02201 Nickel Alloy Pipe Nickel Seamless Pipe And Tube For Aerospace
Introduction
Nickel alloy pipes and tubes are widely used in the aerospace industry due to their excellent corrosion resistance, high temperature strength, and exceptional mechanical properties. ASTM B161 UNS N02200 and UNS N02201 are two popular grades of nickel alloy pipes that are commonly used in aerospace applications. This article provides an overview of these materials, their specifications, key features, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades.
Material and Specification
ASTM B161 is the standard specification for nickel seamless pipe and tube. It covers both UNS N02200 and UNS N02201 grades. These grades are primarily differentiated by their carbon content, with UNS N02200 having a maximum carbon content of 0.15% and UNS N02201 having a maximum carbon content of 0.02%.
The standard specifies the dimensions, tolerances, and mechanical properties of the nickel alloy pipes and tubes. It also outlines the testing procedures and requirements for the materials.
Key Features
- Excellent corrosion resistance: Nickel alloy pipes exhibit exceptional resistance to various corrosive environments, including acids, alkalis, and seawater.
- High temperature strength: These pipes can withstand high temperatures without losing their mechanical properties, making them suitable for aerospace applications.
- Good weldability: Nickel alloy pipes can be easily welded using conventional methods, allowing for easy fabrication and installation.
- Low magnetic permeability: These materials have low magnetic permeability, making them suitable for applications where magnetic interference needs to be minimized.
Chemical Composition
| Element | UNS N02200 (%) | UNS N02201 (%) |
| Nickel | 99.0 min | 99.0 min |
| Carbon | 0.15 max | 0.02 max |
| Iron | 0.40 max | 0.40 max |
| Copper | - | - |
| Manganese | - | - |
| Silicon | - | - |
| Sulfur | - | - |
Mechanical Properties
| Property | UNS N02200 | UNS N02201 |
| Tensile Strength | 380-550 MPa | 380-550 MPa |
| Yield Strength | 105-275 MPa | 105-275 MPa |
| Elongation | 40% min | 40% min |
| Hardness | HRB 55-75 | HRB 55-75 |
Steel Grade
ASTM B161 UNS N02200 and UNS N02201 are the primary steel grades used for nickel alloy pipes and tubes in aerospace applications. These grades meet the stringent requirements of the aerospace industry and provide excellent performance in terms of corrosion resistance, strength, and durability.
Application
Nickel alloy pipes and tubes, conforming to ASTM B161 UNS N02200 and UNS N02201, find extensive use in aerospace applications. Some common applications include:
- Aircraft engine components
- Heat exchangers
- Exhaust systems
- Hydraulic systems
- Fuel lines
- Instrumentation tubing
Possible Alternative Grades
While ASTM B161 UNS N02200 and UNS N02201 are widely used in aerospace, there are alternative grades available for specific applications. Some possible alternative grades include:
- Inconel 600
- Inconel 625
- Hastelloy C276
- Monel 400
These alternative grades offer similar or enhanced properties compared to ASTM B161 grades and can be considered based on specific requirements and application conditions.
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