Hastelloy C-22 Tubes – High Durability for Acidic & Oxidizing Environments

Hastelloy C-22 tubes are widely recognized for their superior resistance to corrosion in highly aggressive environments, including acidic and oxidizing conditions. Manufactured using a nickel-chromium-molybdenum alloy, these tubes offer exceptional mechanical strength and longevity, making them an ideal choice for industries such as chemical processing, power generation, and marine applications.

Material Overview

Hastelloy C-22 (UNS N06022) is a versatile and corrosion-resistant alloy composed primarily of nickel, chromium, molybdenum, and iron. This unique composition provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in a wide range of extreme environments.

Chemical Composition:

• Nickel (Ni): Balance

• Chromium (Cr): 20.0-22.5%

• Molybdenum (Mo): 12.5-14.5%

• Iron (Fe): 2.0-6.0%

• Cobalt (Co): ≤ 2.5%

• Tungsten (W): 2.5-3.5%

• Manganese (Mn): ≤ 0.5%

• Silicon (Si): ≤ 0.08%

• Carbon (C): ≤ 0.01%

• Sulfur (S): ≤ 0.02%

Applications of Hastelloy C-22 Tubes

Hastelloy C-22 tubes are widely used across multiple industries due to their exceptional resistance to both acidic and oxidizing media. Some key applications include:

1. Chemical Processing: Used in piping systems, heat exchangers, and reactors handling strong acids such as sulfuric, hydrochloric, and nitric acid.

2. Pharmaceutical & Food Processing: Ensures hygiene and contamination-free transportation of fluids in harsh processing conditions.

3. Power Plants: Applied in flue gas desulfurization systems and cooling circuits to withstand corrosive exhaust gases.

4. Marine & Offshore Industry: Offers excellent resistance to seawater corrosion, making it ideal for desalination plants and marine structural components.

5. Aerospace Industry: Used in fuel and hydraulic systems exposed to extreme temperatures and aggressive chemical environments.

Types of Hastelloy C-22 Tubes

Hastelloy C-22 tubes come in various types to suit different industrial requirements:

• Seamless Tubes: Manufactured without welding, ensuring superior strength and resistance to pressure.

• Welded Tubes: Cost-effective and suitable for applications where absolute structural integrity is not required.

• Heat Exchanger Tubes: Designed for efficient heat transfer in aggressive environments.

• Instrumentation Tubes: Used in high-precision applications requiring leak-proof performance.

Manufacturing Process

The production of Hastelloy C-22 tubes involves stringent quality control to ensure high durability and corrosion resistance:

1. Raw Material Selection: High-quality nickel alloy is used to ensure optimal chemical properties.

2. Tube Forming: Tubes are extruded or rolled into seamless or welded forms.

3. Heat Treatment: Solution annealing enhances corrosion resistance and mechanical strength.

4. Surface Finishing: Pickling and passivation are applied to improve cleanliness and longevity.

5. Quality Testing: Includes hydrostatic, eddy current, and ultrasonic testing to meet ASTM B622 and ASTM B619 standards.

User Demand & Market Trends

With increasing industrial demand for corrosion-resistant materials, Hastelloy C-22 tubes have become an essential component in various sectors. Key trends include:

• Customization Options: Available in different sizes, wall thicknesses, and lengths.

• Cost Efficiency: Bulk production and factory-direct supply ensure competitive pricing.

• Global Distribution: Reliable supply chains ensure fast and secure delivery worldwide.

• Compliance with International Standards: Ensures safety, performance, and durability in industrial applications.