Hastelloy C-22 Strips – Industrial-Grade Alloy with Maximum Corrosion Resistance

Introduction

Hastelloy C-22 is a nickel-based superalloy known for its exceptional corrosion resistance, making it a preferred choice in highly aggressive environments. When processed into strips, this alloy offers versatility and reliability for various industrial applications requiring high strength and durability.

Material Composition and Properties

Hastelloy C-22 is primarily composed of nickel, with significant additions of chromium, molybdenum, and iron. It also contains tungsten and cobalt, further enhancing its corrosion-resistant properties. Key attributes of Hastelloy C-22 strips include:

• Superior Corrosion Resistance: Highly resistant to pitting, crevice corrosion, and stress corrosion cracking in both oxidizing and reducing environments.

• High Thermal Stability: Maintains mechanical integrity even at elevated temperatures.

• Excellent Fabricability: Easily formed, welded, and machined for a variety of industrial uses.

• Chemical Inertness: Performs well in harsh chemical conditions, including acid processing environments.

Applications of Hastelloy C-22 Strips

The unique properties of Hastelloy C-22 strips make them suitable for numerous applications across different industries:

1. Chemical Processing Industry: Used in reactors, heat exchangers, and piping systems to handle aggressive chemicals.

2. Aerospace and Marine Engineering: Ideal for components exposed to high humidity, saline environments, and extreme temperatures.

3. Pharmaceutical and Food Industry: Applied in sterilization equipment and process tanks where hygiene and corrosion resistance are critical.

4. Flue Gas Scrubbing Systems: Utilized in pollution control devices to withstand highly acidic gases and harsh conditions.

5. Power Plants: Used in geothermal and nuclear plants where extreme environmental conditions require superior material performance.

Grades and Standards

Hastelloy C-22 is available in various international standards and specifications, ensuring its suitability for global industrial applications. Some key designations include:

• UNS Number: N06022

• ASTM Standards: ASTM B575 (Sheets and Strips), ASTM B622 (Seamless Pipes), ASTM B619/B626 (Welded Pipes & Tubes)

• EN/DIN Equivalent: 2.4602

Manufacturing Process

The production of Hastelloy C-22 strips involves multiple stages to achieve optimal performance:

1. Melting and Alloying: The raw materials are melted using vacuum induction melting (VIM) or electric arc furnace (EAF) to achieve the desired composition.

2. Hot and Cold Rolling: The alloy is processed through rolling mills to form strips of various thicknesses.

3. Annealing: Heat treatment is applied to enhance ductility and corrosion resistance.

4. Surface Treatment: Pickling and passivation are performed to maintain a clean, corrosion-resistant surface.

5. Quality Testing: Mechanical and chemical testing, including tensile strength, hardness, and corrosion resistance assessments, are conducted to ensure compliance with industry standards.

User Requirements and Customization

Industries utilizing Hastelloy C-22 strips often require tailored specifications to meet their operational needs. Common customization options include:

• Thickness and Width Variability: Precision cutting for specific industrial applications.

• Surface Finish Options: Available in polished, brushed, or mill finish.

• Formability and Weldability: Ensuring ease of fabrication into complex shapes and structures.

• Regulatory Compliance: Meeting ASTM, ASME, and other industry certifications for guaranteed safety and performance.