SS316 Water Pump Investment Casting Impeller​

Product Overview

This critical component converts rotational energy into fluid flow, powering water circulation in industrial, marine, and wastewater applications. Unlike traditional machining, investment casting creates complex blade geometries with smooth surfaces that minimize hydraulic loss and maximize pump efficiency. Our impellers are designed to withstand aggressive fluids, including seawater, chemicals, and high-temperature water, making them indispensable in environments where reliability and longevity are paramount.

Product Features

Superior Corrosion Resistance: 316 stainless steel, containing 10–14% nickel and 2–3% molybdenum, delivers 1,000+ hours of neutral salt fog resistance (ASTM B117) and resists pitting in chloride-rich environments (up to 10,000 ppm Cl⁻).

Aerodynamic Efficiency: Investment casting produces blades with streamlined profiles and surface finishes as smooth as Ra 0.8 μm, reducing turbulence and improving hydraulic efficiency by 5–10% compared to sand-cast alternatives.

High-Strength Performance: With a tensile strength of 580–750 MPa and yield strength of 205 MPa min, the impellers withstand rotational speeds up to 3,600 RPM without deformation.

Dimensional Precision: Investment casting achieves tolerances of ±0.02 mm on critical blade angles and diameters, ensuring balanced rotation and reduced vibration.

Applications

These impellers are integral to diverse pumping systems:

Marine & Offshore: Seawater cooling pumps, bilge pumps, and desalination plant impellers resist saltwater corrosion.

Industrial Processing: Chemical transfer pumps, boiler feed pumps, and wastewater treatment pumps handle acidic/alkaline fluids.

HVAC & Utilities: Chilled water pumps, fire suppression pumps, and irrigation systems benefit from efficient fluid movement.

Food & Pharmaceutical: Sanitary pumps for water purification and beverage processing meet 3-A Sanitary Standards with electropolished surfaces.

FAQ

Q: Why is 316 stainless steel preferred over 304 for water pump impellers?

A: 316’s molybdenum content enhances resistance to pitting corrosion in chloride environments, extending service life by 2–3x compared to 304 in marine or industrial applications.

Q: What is the maximum temperature rating of these impellers?

A: SS316 maintains mechanical properties up to 870°C, making the impellers suitable for high-temperature applications such as boiler feed pumps operating at 150–200°C.

Q: How are impellers balanced to prevent vibration?

A: Each impeller undergoes dynamic balancing to ISO 1940 Grade 6.3, ensuring residual unbalance below 0.02 g·mm/kg for smooth operation at maximum RPM.