Core Advantages

1. Complex Shape & Flow Channel Design

   Casting easily forms intricate internal cavities, curved passages and multi-port structures that meet hydraulic and fluid control requirements, hard to achieve by forging or machining.

2. High Structural Integrity & Pressure Resistance

   Integral casting eliminates assembly gaps. Dense structure withstands medium and high working pressure, preventing leakage under long-term operation.

3. Cost-Efficiency for Mass Production

   Mature casting technology lowers overall production cost compared to fully machined parts, ideal for bulk orders and standard models.

4. Good Vibration Damping

   Cast iron variants absorb vibration and running noise, keeping valves and pumps operating smoothly.

5. Wide Material Selectivity

   Multiple metal options adapt to ordinary water, oil, high-temperature steam, corrosive chemicals and abrasive slurry.

Common Materials & Applications

1. Gray Iron (HT200 / HT250 / GG20 / GG25)

• Features: Low cost, strong rigidity, great vibration damping and machinability
• Use: General water pumps, circulating pumps, low-pressure water valves, HVAC fluid components

2. Ductile Iron (QT400 / QT500 / GGG40 / GGG50)

• Features: Higher strength, toughness and impact resistance than gray iron
• Use: Medium-pressure pumps, industrial control valves, mining slurry pumps, outdoor heavy-duty fluid parts

3. Carbon Steel Castings (ASTM A216 WCA / WCB / WCC)

• Features: High pressure & temperature resistance, good weldability
• Use: Oil & gas pipelines, boiler valves, high-temperature water/steam pumps, power plant fluid equipment

4. Alloy Steel Castings (ASTM A217 WC6 / WC9)

• Features: Excellent heat resistance and creep resistance
• Use: High-temperature process valves, furnace pumps, petrochemical high-pressure components

5. Stainless Steel Castings (304 / 316L / CF8 / CF8M)

• Features: Outstanding corrosion resistance against acid, alkali and seawater
• Use: Chemical pumps & valves, marine fluid equipment, food & pharmaceutical processing systems

Main Casting Processes

• Green Sand Casting: For large-size, standard castings, high output and low cost
• Resin Sand Casting: Better surface finish, higher dimensional accuracy, fewer defects for critical pressure parts
• Investment Casting: Ultra-precise for small, complex high-end valve and pump components
• Gravity Casting: Stable quality for medium-sized non-ferrous and steel cast housings

Production & Finishing Workflow

1. Molding, melting and pouring raw metal
2. Cooling, shakeout, riser and burr removal
3. Stress relief heat treatment to prevent deformation
4. CNC precision machining for sealing surfaces, flanges and mounting holes
5. Drilling, tapping and assembly processing
6. Non-destructive testing and hydraulic pressure leakage test
7. Surface treatment (painting, passivation) and final inspection

Quality Control Standards

• Chemical composition and mechanical property testing
• UT/MT/PT inspection to eliminate porosity, sand inclusions and cracks
• Strict dimensional tolerance control per drawings
• Hydrostatic pressure test to ensure zero leakage
• Compliant with ASTM, EN, ISO standards; complete MTC available

Typical Application Industries

• Water supply & drainage, sewage treatment
• Oil, gas and petrochemical engineering
• Thermal power, new energy power plants
• Mining, metallurgy and cement industry
• Chemical, marine and pharmaceutical equipment

Conclusion