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Cast Iron Parts for Precision CNC Machining

Gray Cast Iron:
Gray cast iron typically contains:

Carbon (C): 2.5%-4.0%

Silicon (Si): 1.0%-3.0%

Manganese (Mn): 0.5%-1.4%

Phosphorus (P): <0.3%

Sulfur (S): <0.15%

Key properties:

Density: 7.2-7.3g/cm³

Thermal expansion coefficient: (10.4-11.6)×10⁻⁶/°C

Thermal conductivity: 40-50W/(m·K)

Microstructure: Flake graphite in metallic matrix (pearlite, ferrite, or mixed)

Tensile strength: 100-400MPa

Hardness: HB170-241

Grade examples: HT100 (≥100MPa), HT300 (≥300MPa)

Ductile Cast Iron:
Composition includes:

Carbon: 3.5%-4.0%

Silicon: 2.0%-3.0%

Manganese: <0.5%

Phosphorus: <0.08%

Sulfur: <0.03%

Magnesium (Mg) and rare earth elements for spheroidization

Key properties:

Density: 7.0-7.2g/cm³

Thermal expansion: (10.2-11.8)×10⁻⁶/°C

Thermal conductivity: 30-40W/(m·K)

Microstructure: Spheroidal graphite in metallic matrix (ferrite, pearlite, or bainite)

Superior mechanical properties:

Tensile strength: 400-900MPa

Elongation: 2%-20%

Grade examples: QT400-18 (400MPa, 18% elongation), QT700-2 (700MPa, 2% elongation)

[Zhuchuang Machinery] - Your Trusted Machining Partner
We specialize in:

Precision CNC machining services

Professional cast iron parts processing

High-quality aluminum casting production

Precision stamped parts manufacturing

Custom mechanical components fabrication

CNC punching services

Sand casting technology solutions

Small aluminum structural castings

One-stop machining services

Expert cast iron processing techniques

Our comprehensive capabilities cover:
• CNC machining of cast iron and aluminum components
• Secondary processing for improved dimensional accuracy
• Surface treatment and finishing services
• Quality inspection and testing

Whether you require standard gray cast iron parts, high-strength ductile iron components, or complex aluminum castings with CNC machining, we deliver precision-engineered solutions with competitive lead times and strict quality control.