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    22May, 2026
    Precision Machined Gray Iron Castings
    Gray iron castings processed with precision machining serve as classic housing solutions for industrial pumps. Featuring stable mechanical performance, fine castability and cost merits, these finished casings fit water, chemical, slurry and oil pumps perfectly, securing steady fluid conveyance.

    Core Superior Properties

    • Strong vibration absorption

      Flaky graphite structure absorbs vibration and noise, keeping pumps run smoothly under continuous operation.

    • High structural rigidity

      Resist deformation under hydraulic pressure, guarantee stable assembly and tight sealing effect.

    • Excellent cast forming ability

      Easily manufacture complex inner flow passages and irregular shapes to match hydraulic design demands.

    • Superb machinability

      Smooth cutting performance enables precise processing of sealing faces, mounting holes and flange surfaces.

    • Moderate medium corrosion resistance

      Well adapt to water, oil and neutral industrial liquid working environments.

    • Economical practical material

      Lower cost than ductile iron and steel castings, ideal for mass industrial pump production.

    Regular Material Grades

    • HT200 / GG20: Standard grade for common industrial pump housings
    • HT250 / GG25: High-strength type for medium-pressure heavy-duty pumps
    • HT300 / GG300: Ultra-rigid grade for high-pressure large pump bodies

    Precision Machining Flow

    1. Blank trimming and deburring after casting
    2. Stress relief heat treatment to eliminate internal strain
    3. CNC rough machining and finish machining
    4. Drilling, tapping and positioning precision processing
    5. Flatness, dimension and tolerance full inspection
    6. Hydraulic leakage test before delivery

    Common Application Scenarios

    Circulating water pumps, sewage pumps, mining slurry pumps, fire pumps, chemical process pumps, hydraulic oil pump shells and HVAC pump components.

    Strict Quality Assurance

    • Chemical composition and hardness detection
    • Visual inspection and internal defect checking
    • Dimensional conformity verification per drawing
    • Pressure tightness test
    • Compliance with ISO and industrial manufacturing standards

    Summary

    Precision machined gray iron castings remain cost-effective and reliable housing choices for industrial pumps. Stable structure, low vibration and good sealing performance extend equipment service life and cut operational maintenance expenses.

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    20May, 2026
    Precision Machined Gray Iron Castings
    Precision machined gray iron castings are the most mainstream and reliable material choice for industrial pump housings. Manufactured via professional sand casting process and finished by strict CNC precision machining, these gray iron pump casings own outstanding structural rigidity, superior vibration absorption, stable pressure bearing capacity and affordable cost, widely used in water pumps, oil pumps, chemical pumps, slurry pumps and various industrial fluid transmission equipment.

    Core Advantages of Gray Iron Castings for Pump Housings

    1. Excellent Vibration & Noise Damping Capacity

      Flake graphite structure effectively absorbs mechanical vibration and fluid pulsation, greatly reducing running noise and improving pump operation stability.

    2. High Structural Rigidty & Deformation Resistance

      Good overall rigidity ensures the pump housing keeps stable shape under long-term hydraulic pressure, avoids assembly offset and sealing failure.

    3. Strong Pressure Resistance & Tight Sealing Performance

      Dense casting structure can bear medium and high working pressure, perfect for sealing surface machining, effectively prevent liquid leakage.

    4. Superior Castability for Complex Cavities

      Easy to form complex internal flow channels, curved passages and irregular pump body structures, meets various hydraulic design requirements.

    5. Great Machinability for High Precision Finishing

      Smooth cutting performance, easy to process precise mounting holes, flange faces, sealing surfaces and assembly positioning dimensions.

    6. Good Thermal Stability & Corrosion Resistance

      Stable performance under continuous temperature change, fine resistance to ordinary water, oil and neutral industrial medium erosion.

    7. Cost-Effective & Mature Application

      Lower material and production cost than ductile iron and steel castings, fully meet daily industrial pump long-term working demands.

    Common Gray Iron Material Grades

    • GG20 / HT200: Standard grade for general industrial pump housings
    • GG25 / HT250: High strength grade for medium-pressure, heavy-duty pump casings
    • GG30 / HT300: Super rigid grade for high-pressure large industrial pump bodies

    Strict Precision Machining Process

    1. Rough casting blank treatment, remove risers, burrs and surface defects
    2. Stress relief heat treatment to eliminate casting internal stress
    3. CNC rough machining to reserve fine machining allowance
    4. Precision finish machining for flange surface, installation datum, inner cavity and sealing surface
    5. Drilling, tapping and hole position precision processing
    6. Flatness, verticality and dimensional tolerance full inspection
    7. Pressure leakage test before delivery

    Main Application Fields of Gray Iron Pump Housings

    • Industrial circulating water pumps, booster pumps
    • Chemical process pumps and sewage treatment pumps
    • Mining slurry pumps and mineral processing transfer pumps
    • Fire-fighting pumps, agricultural irrigation pumps
    • HVAC system water circulation pump components
    • Hydraulic oil pump and lubrication pump shells

    Quality Control Standards

    • Raw material chemical composition inspection
    • Hardness and tensile strength mechanical test
    • Visual and surface defect inspection
    • Internal flaw detection to avoid shrinkage hole and sand inclusion
    • Strict dimensional tolerance control per drawing
    • Hydraulic pressure test to ensure no leakage
    • ISO and industry standard compliance

    Conclusion

    Precision machined gray iron castings remain the preferred solution for mass-produced and general heavy-duty industrial pump housings. With stable structure, low vibration, easy processing and economic benefits, they ensure smooth fluid delivery, reliable sealing and long service life for all kinds of industrial pump equipment.

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