Hastelloy Alloy Pipe/Tube is a tubular product made from a family of nickel-based superalloys renowned for their exceptional and comprehensive corrosion resistance across the most aggressive chemical processing environments. Their high content of Molybdenum and Chromium allows them to resist virtually all corrosive media, including strong reducing acids, oxidizing acids, and wet chlorine, while offering superior resistance to pitting and stress-corrosion cracking. Hastelloy pipe is mandatory for critical components like reactor vessels, heat exchangers, and process lines in the chemical processing, pharmaceutical, and pollution control industries where severe service and maximum corrosion defense are required.

Hastelloy Alloy Pipe Description

HASTELLOY alloys, a proprietary trademark of Haynes International, are the leading family of nickel-based alloys designed specifically for ultimate resistance to the most aggressive corrosive media. HASTELLOY tube and pipe products are engineered for non-redundant, critical service in the chemical process industry (CPI), pollution control,

Core HASTELLOY Alloy Tube/Pipe Grades Comparison

The HASTELLOY portfolio is specialized, offering unparalleled resistance in distinct corrosive environments (C-Type for versatile corrosion, B-Type for reducing acids, G-Type for strong oxidizing acids).

General Performance Characteristics of HASTELLOY® Alloy Tube and Pipe

1. Corrosion Performance

Pitting and Crevice Resistance: The high Mo and W content provides exceptionally high Pitting Resistance Equivalent Number (PREN), making HASTELLOY tubing virtually immune to localized attack in chloride-rich solutions.

Weld Zone Integrity: Modern HASTELLOY grades (C-276, C-22, B-3, G-30) are designed with ultra-low carbon and controlled minor element additions to prevent detrimental phase formation (sensitization) in the heat-affected zone (HAZ), allowing them to be used in critical piping systems in the as-welded condition.

Multi-Acid Service: C-type alloys resist both highly reducing (e.g., concentrated HCl) and highly oxidizing (e.g., nitric acid mixtures) media, a feat few other materials can achieve.

2. Mechanical and Physical Properties

Strength: HASTELLOY tubing provides superior tensile and yield strength compared to standard stainless steels, allowing for thinner walls under high pressure, which is beneficial for heat transfer efficiency and cost.

Ductility: As solid solution alloys, they maintain excellent ductility and toughness, which is crucial for bending and cold-forming required in complex industrial piping layouts.

3. Fabrication and Installation

Forming: Although exhibiting high work hardening rates, HASTELLOY pipe can be readily cold-formed and bent using appropriate tooling, allowing for precise system fabrication.

Heat Treatment: Most HASTELLOY wrought products are solution-annealed. C-type and G-type pipes generally do not require post-weld heat treatment (PWHT) for corrosion resistance.

Application Value of HASTELLOY® Tube and Pipe

HASTELLOY tube and pipe are utilized in systems where extreme corrosivity necessitates the highest degree of material integrity and reliability:

Chemical Process Industry (CPI): Reactor coils, distillation column piping, transfer lines, and heat exchanger bundles handling boiling acids, aggressive solvents, and mixed halide media.

Pollution Control: Tubing and piping for scrubbers and stack liners in Flue Gas Desulfurization (FGD) systems to resist highly corrosive sulfurous/chloride condensate (C-276, C-22).

Pharmaceutical and Fine Chemicals: Equipment and piping where metallic contamination must be strictly avoided, often utilizing the low corrosion rate of C-22.

Acid Manufacturing: Piping and evaporators for concentrated Hydrochloric Acid (B-3) and Phosphoric Acid (G-30).