Hastelloy G3

Hastelloy G3 is a nickel-chromium-molybdenum-iron alloy specifically designed to deliver exceptional resistance to both oxidizing and reducing corrosive environments. This alloy stands out for its superior resistance to pitting, crevice corrosion, and stress corrosion cracking, even in harsh media containing chloride ions, sulfuric acid, and phosphoric acid—making it ideal for applications involving highly aggressive chemicals. Hastelloy G3 boasts excellent weldability and formability, enabling fabrication into complex-shaped components for diverse industrial scenarios. Its ability to maintain stable performance across a wide temperature range (from ambient to approximately 1040 °C / 1900°F) and its reliable corrosion resistance make it a preferred choice in industries dealing with extreme operating conditions.

Behaviour that matters in service

• Dual-Environment Corrosion Resistance — Excels in both oxidizing (e.g., nitric acid, hypochlorite solutions) and reducing (e.g., sulfuric acid, hydrochloric acid) environments, with strong resistance to chloride-induced pitting and crevice corrosion—ideal for mixed-acid process streams.
• High-Temperature Stability — Maintains excellent mechanical strength and corrosion resistance at elevated temperatures (up to 1040 °C), suitable for high-heat industrial applications like furnace components and heat exchangers.
• Superior Weldability — Compatible with common welding processes (TIG, MIG, SMAW) without requiring pre-heating; welded joints retain high corrosion resistance and mechanical strength, avoiding post-weld cracking risks.
• Good Fabricability — Easily processed via cold rolling, forging, and machining (with appropriate tooling); post-fabrication heat treatment (e.g., annealing at 1150 – 1180 °C followed by rapid cooling) optimizes its corrosion resistance and ductility.

Typical applications

• Chemical Processing — Equipment such as reactors, heat exchangers, and storage tanks for handling mixed acids (e.g., sulfuric-nitric acid blends), phosphoric acid, and chloride-containing solutions.
• Pharmaceuticals — Stainless steel-compatible machinery (e.g., mixing vessels, transfer pipes) for drug synthesis, where high purity and resistance to organic/inorganic corrosive reagents are critical.
• Oil and Gas — Downhole tools, wellhead components, and pipeline systems for sour gas (containing hydrogen sulfide) and high-chloride brine environments, ensuring long-term service in offshore and onshore extraction.
• Environmental Technologies — Components for flue gas desulfurization (FGD) systems, wastewater treatment equipment, and landfill leachate processing units—resisting corrosion from acidic and chloride-rich waste streams.
• Mining and Metallurgy — Acid leaching tanks, electrolytic cells, and slurry pumps for mineral processing (e.g., copper, nickel extraction), where aggressive acidic media and solid particle erosion are common.