High-Performance Hastelloy C276 Nickel Alloy Pipe with Molybdenum ≥16% and Reduction of Area 40% min

High-Performance Nickel Alloy Pipes for Your Industrial Requirements

HC-276, commonly referred to as Hastelloy C-276, is a nickel-based superalloy celebrated for its exceptional corrosion resistance and robust performance across extreme environments. Below is a structured and detailed overview:

Chemical Composition

• Acids: Withstands strong reducing acids (e.g., sulfuric, hydrochloric, hydrofluoric) and mixed acids (e.g., sulfuric-hydrochloric blends), even at high concentrations and temperatures. For example, in 20% boiling hydrochloric acid, its annual corrosion rate is ≤0.1 mm/year, far outperforming 316L stainless steel.
• Chlorides: Resists pitting and crevice corrosion in chloride-rich solutions (e.g., seawater, brines) due to a high Pitting Resistance Equivalent Number (PREN ≈ 76).
• Alkalis: Performs well in concentrated alkaline solutions (e.g., sodium hydroxide) at moderate temperatures.
• Oxidizing Environments: Chromium content ensures stability in oxidizing media (e.g., nitric acid, hypochlorites) and high-temperature oxidation.
• Stress Corrosion Cracking (SCC): Shows minimal susceptibility to SCC in chloride or sulfide environments, a critical advantage over many stainless steels.

Fabrication and Processing

• Forming: Cold working (e.g., bending, rolling) is feasible but may require intermediate annealing to restore ductility. Hot working is performed at 1,040–1,175°C (1,900–2,150°F).
• Welding: Can be welded using processes like TIG (GTAW) or MIG (GMAW) with matching filler metals (e.g., ERNiCrMo-4). Post-weld annealing is not required due to low carbon content, simplifying processing.
• Machining: Machinability is moderate; tools with high-speed steel or carbide inserts are recommended, with coolants to prevent overheating.

Applications

• Chemical Processing: Reaction vessels, heat exchangers, and pipelines handling acids, solvents, and reactive chemicals.
• Oil & Gas: Downhole equipment, subsea pipelines, and offshore platforms exposed to brines, sulfides, and high pressures.
• Environmental Engineering: Flue gas desulfurization systems (FGD) and wastewater treatment equipment.
• Pharmaceuticals: Cleanroom components and reactor systems requiring high purity and resistance to sanitizing agents.
• Aerospace & Energy: Components in gas turbines and industrial furnaces operating at elevated temperatures.

Standards and Specifications

• ASTM B575 (sheet, plate, strip)
• ASTM B574 (bars, rods, forgings)
• ASME Section VIII (pressure vessel code)
• ISO 15156 (for oilfield equipment in sour service).