In industrial manufacturing where mechanical strength and economic efficiency must be balanced, ductile iron components provide optimal solutions. Our China factory specializes in producing Custom Ductile Cast Iron Parts using QT500-7 grade material, delivering high-performance casting services that combine superior mechanical properties with cost-effective production for global clients across various sectors.
Premium Material: QT500-7 Ductile Iron
QT500-7 (Grade 500-7 per ISO 1083) represents an exceptional balance of strength and ductility in cast iron materials, characterized by:
Minimum tensile strength of 500 MPa and yield strength of 320 MPa
Elongation of 7% minimum, providing good impact resistance
Brinell hardness of 170-230 HB, ensuring excellent machinability
Fatigue strength approximately 225 MPa under rotating bending conditions
Enhanced pressure tightness and vibration damping capacity
The spheroidal graphite microstructure, achieved through controlled magnesium and cerium treatment, provides these superior properties while maintaining the casting fluidity necessary for complex geometries.
Advanced Manufacturing Process
Our integrated production system ensures consistent quality:
Foundry Technology
Resin sand molding with 3D printed patterns for rapid prototyping
Controlled pouring temperatures (1420-1480°C) with automated systems
In-mold and stream inoculation for consistent nodularization ≥85%
Real-time thermal analysis during solidification phases
Heat Treatment Process
Stress relieving at 550-600°C for dimensional stability
Normalizing at 900-925°C for refined pearlitic microstructure
Optional quenching and tempering for enhanced mechanical properties
Surface treatments including shot blasting and anti-corrosion coatings
Precision Machining Capabilities
Our comprehensive machining services include:
CNC turning and milling maintaining tolerances within ±0.05mm
Precision boring operations with positional accuracy ±0.01mm
Surface grinding achieving Ra 1.6-3.2 μm finishes
Coordinate measuring machine verification
Custom fixture design for complex part geometries
Performance Characteristics
QT500-7 ductile iron parts deliver:
Excellent strength-to-weight ratio compared to steel alternatives
Good corrosion resistance in various industrial environments
Superior impact resistance at ambient temperatures
Pressure tightness up to 40 bar without impregnation
Reduced manufacturing costs through near-net-shape production
Excellent wear resistance for moving components
Quality Assurance Protocol
Each casting undergoes rigorous validation:
Spectrochemical analysis for material certification
Ultrasonic testing for internal integrity assessment
Magnetic particle inspection for surface defect detection
Mechanical testing including tensile and impact tests
Dimensional inspection using CMM technology
Microstructure examination per ISO 945 standards
Technical Applications
Our QT500-7 ductile iron castings serve critical functions in:
Automotive components: Brackets, hubs, and structural parts
Hydraulic equipment: Valve bodies, pump housings, and cylinders
Machinery components: Gears, pulleys, and machine bases
Agricultural equipment: Transmission cases and implement parts
Industrial applications: Press frames and equipment supports
Our engineering team provides comprehensive technical support from design optimization through production, ensuring each customized casting meets exact performance requirements while maximizing manufacturing efficiency and cost-effectiveness. By combining advanced foundry technology with stringent quality control, we deliver ductile iron components that ensure reliable performance, extended service life, and reduced total cost of ownership across diverse industrial applications.
About Us
EN
