Hastelloy C-22 Pump Parts Precision Investment Casting Foundry
Introduction
Hastelloy C-22 is a nickel-chromium-molybdenum alloy engineered for exceptional resistance to various corrosive environments, including oxidizing and reducing agents. At Neway AeroTech, we specialize in the precision investment casting of Hastelloy C-22 pump parts, ensuring outstanding corrosion performance, dimensional accuracy, and mechanical integrity required for demanding chemical processing, pharmaceutical, and marine applications.
By applying advanced vacuum investment casting techniques, Neway AeroTech delivers Hastelloy C-22 pump components with uniform microstructure, minimal defects, and superior operational reliability under the most aggressive fluid conditions.
Key Manufacturing Challenges for Hastelloy C-22 Pump Parts
Precise chemical composition control to maintain corrosion-resistant properties.
Defect-free solidification under vacuum to avoid inclusions and microporosity.
Dimensional precision within ±0.03 mm for critical pump assemblies.
Achieving excellent surface finishes (Ra ≤1.6 µm) to enhance hydraulic performance.
Precision Investment Casting Process for Hastelloy C-22 Pump Components
The manufacturing process for Hastelloy C-22 pump parts includes:
Wax Pattern Production: Injection molding of highly accurate wax models.
Shell Building: Application of ceramic slurries and fine sands to create a strong mold.
Dewaxing: Steam autoclaving (~150°C) to cleanly remove wax.
Vacuum Melting and Pouring: Hastelloy C-22 alloy melted and poured under high vacuum (<10⁻³ Pa) to prevent oxidation.
Controlled Solidification: Slow cooling (~5–7°C/min) promotes fine-grained, defect-free structure.
Shell Removal and Finishing: Shell removal, CNC machining, and final surface treatments to meet precise specifications.
Comparative Analysis of Pump Component Manufacturing Methods
Process | Surface Finish | Dimensional Precision | Corrosion Resistance | Strength Uniformity | Cost Level |
|---|---|---|---|---|---|
Precision Investment Casting | Excellent (Ra ≤1.6 µm) | Very High (±0.03 mm) | Superior | High | Moderate |
Equiaxed Crystal Casting | Good (Ra ~3 µm) | High (±0.05 mm) | Excellent | Good | Moderate |
Sand Casting | Moderate (Ra ~12 µm) | Moderate (±0.5 mm) | Good | Moderate | Low |
CNC Machining from Billet | Excellent (Ra ≤0.8 µm) | Very High (±0.01 mm) | Good | Excellent | High |
Pump Component Manufacturing Process Selection Strategy
Precision Investment Casting is ideal for Hastelloy C-22 pump parts needing complex geometries, tight tolerances, and superior corrosion resistance.
Equiaxed crystal casting offers cost-effective manufacturing for less critical applications.
Sand casting suits simple, low-precision pump bodies.
CNC Machining applies when extreme dimensional accuracy and surface finishes are required.
Hastelloy C-22 Material Performance Matrix
Material | Tensile Strength (MPa) | Max Temp (°C) | Corrosion Resistance | Primary Applications |
|---|---|---|---|---|
690 | 650 | Outstanding against oxidizing/reducing agents | Chemical pumps, reactors, valve bodies | |
750 | 1038 | Exceptional resistance to harsh chemicals | Process equipment, pump housings | |
760 | 650 | Excellent resistance to hydrochloric acid | Acid handling pumps | |
550 | 480 | Good resistance in seawater environments | Marine pumps, valves | |
930 | 980 | Outstanding seawater and oxidation resistance | Offshore pump systems | |
890 | 800 | Exceptional wear and corrosion resistance | Pump valve seats, trim components |
Rationale for Hastelloy C-22 Material Selection
Hastelloy C-22: Chosen for its unparalleled resistance to both oxidizing and reducing chemicals in pump applications.
Hastelloy C-276: Ideal for the most aggressive chemical environments.
Hastelloy B-3: Preferred where strong reducing media like hydrochloric acid are present.
Monel 400: Suitable for marine and mild chemical service at moderate temperatures.
Inconel 625: Selected for high-temperature and seawater service conditions.
Stellite 6: Used where high wear and corrosion are simultaneously present in pump trim parts.
Essential Post-processing Techniques
Hot Isostatic Pressing (HIP): Improves material density and mechanical reliability by eliminating microporosity at ~1160°C, 100 MPa.
Precision CNC Machining: Achieves tight dimensional tolerances (±0.01 mm) critical for pump assembly fit.
Surface Treatments: Enhance corrosion resistance and improve hydraulic efficiency.
Material Testing & Analysis: Verifies chemical composition, mechanical properties, and microstructural integrity.
Industry Applications and Case Study
Neway AeroTech’s Hastelloy C-22 pump parts are widely used in chemical manufacturing, pharmaceutical production, and pollution control systems. In one chemical plant handling mixed oxidizing and reducing agents, Hastelloy C-22 pump bodies operated reliably for over five years, outperforming standard stainless steel components by reducing maintenance frequency by more than 40%.
FAQs
What dimensional tolerances can Neway AeroTech achieve for Hastelloy C-22 pump parts?
Why is precision investment casting preferred for manufacturing Hastelloy C-22 pump components?
How does Hastelloy C-22 compare to Hastelloy C-276 in corrosion resistance?
Which industries typically use Hastelloy C-22 pump parts?
How does Neway AeroTech ensure material and structural integrity in Hastelloy C-22 pump castings?
