Hastelloy C-22 (UNS N06022): Round Bars, Seamless Tubes & Plates — Technical Data Sheet

Quick Answer: What Is Hastelloy C-22?

Hastelloy C-22 (UNS N06022 / W.Nr. 2.4602) is a premier nickel-chromium-molybdenum-tungsten superalloy formulated for service environments demanding high mechanical strength and exceptional corrosion resistance. Its high performance stems from the solid-solution strengthening from chromium (20.0–22.5%), molybdenum (12.5–14.5%), and tungsten (2.5–3.5%) within its stable nickel-chromium-molybdenum matrix. Its balanced chemistry provides outstanding resistance to both oxidizing and reducing environments while minimizing precipitation tendencies. Operating efficiently from cryogenic temperatures up to a maximum oxidation service of approximately 650°C (1200°F), Hastelloy C-22 is widely utilized in wet chlorine, hypochlorite, chlorine dioxide, and mixed oxidizing/reducing acid service.

Product Overview

At the atomic level, its face-centered cubic (FCC) austenitic matrix ensuring excellent ductility and toughness. Its primary advantage is superior resistance to oxidizing acids compared with C-276, while retaining excellent resistance to reducing media, which yields outstanding resistance to pitting, crevice corrosion, and stress-corrosion cracking, with excellent weldability in the as-welded condition.

Shanghai Hangbo Alloy Group Co., Ltd., established in 2012, stands as a top-tier global manufacturer and supplier of Hastelloy C-22. Operating under a certified ISO 9001:2015 quality management system, we command an export network covering 50+ countries. Our portfolio contains high-precision centerless ground round bars, heavy industrial plates, and high-pressure seamless tubing engineered for critical industrial applications. By managing carbon distribution and grain refinement during melting and forging, we ensure our material provides robust structural performance under severe stress. Every order comes with 100% material traceability and certified documentation, ensuring compliance with strict global engineering standards.

Executive Standards

Shanghai Hangbo Alloy Group Co., Ltd. manufactures Hastelloy C-22 in strict compliance with international technical specifications:

Note: Shanghai Hangbo executes 100% confirmation of chemical compliance using Optical Emission Spectroscopy (OES) for every melt lot.

Chemical Composition

The corrosion-resistant profile of Hastelloy C-22 depends on its exact chemical balance. Chromium ensures high-temperature oxidation resistance, while molybdenum safeguards against localized pitting in chloride environments.

Mechanical Properties

Hastelloy C-22 delivers excellent design allowable stresses. The data below outlines typical properties for annealed stock.

Room-Temperature Mechanical Properties

High-Temperature Performance: Strength Retention Analysis

Hastelloy C-22 retains remarkable mechanical properties under thermal stress, establishing its credentials as a critical superalloy:

How Hastelloy C-22 Is Produced

Round Bar & Forging

• 1. Double Melting (VIM + ESR): high purity and uniform chemistry.
• 2. Hot Forging: heavy deformation refines grain structure.
• 3. Solution Annealing: rapid quenching preserves single-phase solid solution.
• 4. Precision Grinding: centerless grinding to h8/h9 tolerances.

Seamless Tube & Pipe

• 1. Billet Piercing & Extrusion: forged rounds pierced into hollows.
• 2. Cold Pilgering: uniform wall thickness and concentricity.
• 3. Bright Annealing: oxide-free finish in hydrogen atmosphere.
• 4. Defect Testing: 100% ET and hydrostatic testing.

Sheet, Plate & Strip

• 1. Hot Rolling: controlled reduction on four-high mills.
• 2. Cold Rolling: ±0.05 mm gauge control.
• 3. Leveling: tension leveling for flatness.
• 4. Pickling: nitric-hydrofluoric bath for passive surface.

Industry Applications: Solving Engineering Challenges

Chemical Processing

C-22 is preferred for wet-chlorine, hypochlorite, and chlorine-dioxide service, as well as mixed nitric/sulfuric acid streams where C-276 may be borderline.

Pharmaceutical

Its cleanability and corrosion resistance make it suitable for high-purity process equipment.

Waste Treatment

Used in incinerator scrubbers and hazardous-waste neutralization systems.

Pulp & Paper

Handles aggressive bleaching chemicals with excellent resistance to localized corrosion.

Quality Assurance: 7-Stage Zero-Defect Inspection Protocol

Shanghai Hangbo Alloy Group Co., Ltd. deploys an intensive inspection matrix to support a zero-defect mandate across all production lines:

• 1. Chemical verification: OES analysis on every melt batch alongside handheld PMI validation on finished products ensures composition parameters match executive limits.
• 2. Ultrasonic Testing (UT): Performed per ASTM A388 standards across all bars and plates to confirm the absence of inner voids, seams, or gas inclusions.
• 3. Eddy Current Testing (ET): Applied 100% to tubes following ASTM E309 protocols to check surface and sub-surface continuity.
• 4. Hydrostatic Pressure Verification: Tubes undergo hydrostatic tests up to 10,000 PSI to verify wall integrity under high-pressure parameters.
• 5. Mechanical Destructive Testing: Tensile, offset yield, elongation, and Brinell hardness examinations are executed per heat lot to verify strength criteria.
• 6. Dimensional Metrology Check: Digital calipers and computerized laser sensors measure geometry, guaranteeing all diameter, wall, and length tolerances match orders.
• 7. Visual and Microstructure Audit: Surface quality checks are paired with metallographic microscope tests to evaluate grain size (ASTM E112) and phase homogeneity.

All items leave our facilities accompanied by ISO 9001:2015 certification and EN 10204 3.1 Mill Test Certificates. Third-party inspection options through SGS, TUV, or Bureau Veritas (BV) are organized upon customer request.

Frequently asked questions