Zirconium castings

Technical Detail

• Scale Capability: Max 3500kg single piece (ASTM B752 702C)
• Material: ASTM B752 702C/705C

Core Applications of Zirconium Castings in Acetic Acid Plants

1. Critical Defense in Extreme Corrosion Environments
Operational Challenges:
● Boiling acetic acid (99% HAc) with bromide catalysts (e.g., HBr)
● Temperature range: 120-200°C (local hotspots up to 230°C)
● Aggressive ions (Cl⁻, Fe³⁺) accelerating pitting and stress corrosion cracking (SCC)
2. Zirconium Solutions:
● R60702 Castings: Reactor vessels, agitator blades (corrosion rate <0.025 mm/yr)
● Zr-702C Enhanced Grade: Catalyst injection tubes (30% improvement in hydrogen cracking resistance)
● Zr-Ta Gradient Cladding: Weld zone protection (tantalum as sacrificial anode)

3.Comparison of Material Properties:
● The corrosion rate of Hastelloy C276 in boiling acetic acid: 0.45mm/yr
● The corrosion rate of Zirconium R60702 under the same working conditions: 0.018mm/yr