# Hastelloy C

*NS3303*

> Legacy Ni-Cr-Mo alloy for general wet corrosion service in chemical processing.

Hastelloy C is the original nickel-chromium-molybdenum alloy that established the corrosion-resistant alloy family. While largely superseded by C-276 and C22 in new construction, it remains in service in legacy chemical plants. For new projects, C-276 or C22 are recommended as upgraded alternatives.

## Key features

- Legacy Ni-Cr-Mo grade
- Good general corrosion resistance
- Maintenance replacement material
- Upgraded alternatives: C-276, C22
- Still available for existing plant MRO

## Applications

- Legacy chemical plant maintenance
- Pump and valve components
- Heat exchanger retubing
- Existing vessel repair matching
- Educational/reference

## Standards

- ASTM B574
- ASTM B575