The Versatile Upgrade for Oxidizing Environments

Hastelloy C-22 is an enhanced nickel-chromium-molybdenum-tungsten alloy designed to provide even better overall corrosion resistance than the industry-standard C-276. It offers exceptional protection against pitting, crevice corrosion, and stress-corrosion cracking.

• Superior Oxidizing Resistance: With higher chromium content, C-22 provides outstanding resistance to oxidizing aqueous media, including wet chlorine and mixtures containing nitric acid.

• Weld Zone Stability: Its unique chemistry ensures excellent thermal stability, minimizing the precipitation of grain-boundary carbides during welding.

• Broad Versatility: It is the "go-to" alloy when a process stream involves both reducing and oxidizing conditions, offering a broader range of protection.

• Core Applications: Extensively used in pharmaceutical manufacturing (clean-in-place systems), chemical processing reactors, and waste-water treatment.

Hastelloy Alloy Comparison: C-276, C-22, B-3, and X

1. Chemical Composition (Nominal Weight %)

This table illustrates the unique metallurgical profiles of different Hastelloy grades, highlighting the balance of Nickel, Chromium, and Molybdenum.

2. Mechanical & Physical Properties (Typical Values)

3. Application & Corrosion Resistance Guide

Each grade is optimized for specific industrial challenges. Choosing the right one ensures longevity and safety.

• Hastelloy C-276: The "Workhorse." Best for mixed acid environments, flue gas desulfurization (FGD), and pulp/paper production.

• Hastelloy C-22: Superior resistance to oxidizing aqueous media and better thermal stability during welding than C-276.

• Hastelloy B-3: Specifically engineered for Hydrochloric Acid (HCl) at all concentrations and temperatures. It has improved thermal stability over B-2.

• Hastelloy X: Known for excellent oxidation resistance and strength at high temperatures (up to 1200°C). Ideal for gas turbines and furnace parts.

• Hastelloy C-2000: The most versatile alloy for mixed acid systems containing both oxidizing and reducing agents.