ASTM B163 Nickel Alloy Pipes: UNS N08800 (Inconel 800), UNS N08810 (Incoloy 800H), UNS N08811 (Incoloy 800HT), UNS N08825 (Incoloy 825)

Nickel alloy pipes are essential components in various industrial applications, particularly in heat exchangers. This article delves into the specifics of ASTM B163 nickel alloy pipes, focusing on the grades UNS N08800 (Inconel 800), UNS N08810 (Incoloy 800H), UNS N08811 (Incoloy 800HT), and UNS N08825 (Incoloy 825).

Material Specification

ASTM B163 is a standard specification for seamless nickel and nickel alloy condenser and heat-exchanger tubes. These materials are known for their excellent resistance to oxidation, corrosion, and high-temperature environments.

Key Features

• High-Temperature Resistance: These alloys maintain strength and stability at elevated temperatures.
• Corrosion Resistance: Excellent resistance to oxidation and corrosion in various environments.
• Durability: High mechanical strength and toughness.
• Versatility: Suitable for a wide range of industrial applications.

Chemical Composition

Below is the chemical composition of these nickel alloys:

Mechanical Properties

The mechanical properties of these nickel alloys are as follows:

Steel Grade

• UNS N08800 (Inconel 800): Known for its excellent strength and resistance to oxidation and carburization.
• UNS N08810 (Incoloy 800H): Enhanced creep and stress rupture properties.
• UNS N08811 (Incoloy 800HT): Similar to 800H but with improved high-temperature properties.
• UNS N08825 (Incoloy 825): Offers excellent resistance to both reducing and oxidizing acids, stress-corrosion cracking, and localized attack.

Application

These nickel alloy pipes are widely used in:

• Heat exchangers
• Chemical processing
• Petrochemical industries
• Power generation
• Oil and gas extraction

Possible Alternative Grades

• UNS N06600 (Inconel 600): Offers good oxidation resistance at high temperatures.
• UNS N06625 (Inconel 625): Known for its high strength and resistance to corrosion and oxidation.
• UNS N10276 (Hastelloy C276): Excellent resistance to pitting and stress-corrosion cracking.

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