# Hastelloy C-4

*N06455 · NS3305*

> High-temperature stable Ni-Cr-Mo alloy free of intergranular precipitation for chemical equipment.

Hastelloy C-4 is a nickel-chromium-molybdenum alloy specifically designed to resist the formation of grain-boundary precipitates during welding and elevated-temperature exposure. This high-temperature stability makes it suitable for chemical process equipment operating in the as-welded condition without post-weld heat treatment.

## Key features

- No intergranular precipitation
- As-welded operation
- High-temperature microstructural stability
- Good general corrosion resistance
- Alternative to C-276 for specific media

## Applications

- Welded chemical vessels
- Pesticide production equipment
- Chlorinated organics processing
- Herbicide synthesis reactors
- Fine chemical manufacturing

## Standards

- ASTM B574
- ASTM B575
- ASTM B619