Gray Iron Casting
Foundry & Manufacturer
Supplying high-density gray iron (cast iron) castings with optimized thermal conductivity, damping properties, and superior machinability for industrial OEMs.
Metallurgical Specs
- Flake Type: Type A Graphite
- Damping: Excellent Vibration Absorption
- Hardness: 170 - 240 HBW
- Standards: EN 1561 / ASTM A48
High-Density Class Gray Iron Castings
Gray Cast Iron is characterized by its flake graphite microstructure. These flakes act as internal acoustic dampers, giving gray iron a remarkable capacity to absorb mechanical vibrations and damp noise, making it the premier choice for machine tool bases, gearboxes, flywheels, and compressor housings.
At Asian Technocast LLP, we utilize medium-frequency induction furnaces to melt raw materials with precise control over carbon, silicon, manganese, sulfur, and phosphorus. Our sand preparation plant maintains optimal moisture and permeability in green sand molds to prevent gas porosity, ensuring high-density internal soundness in every casting.
Thermal Conductivity
Excellent heat dissipation properties for brake discs and drums.
High Machinability
Free graphite flakes act as natural chip breakers during CNC milling.
Common Gray Iron Grades & Standards
| EN Standard | ASTM Equivalent | Tensile Strength | Typical Applications |
|---|---|---|---|
| EN-GJL-150 | Class 20 / 25 | 150 MPa | Manifold covers, pulleys, brackets |
| EN-GJL-200 | Class 30 | 200 MPa | Pump housings, valve bodies, gearboxes |
| EN-GJL-250 | Class 35 | 250 MPa | Heavy machine frames, cylinder heads |
| EN-GJL-300 | Class 40 / 45 | 300 MPa | High-stress gear casing, structural bases |
Gray Iron Casting Questions Answered
We cast standard gray iron grades including EN-GJL-150, EN-GJL-200, EN-GJL-250, and EN-GJL-300, corresponding to ASTM Class 25, Class 30, Class 35, and Class 40. These grades offer excellent machinability and vibration damping properties.
Gray iron is selected for its superior thermal conductivity, excellent vibration damping capacity, high compressive strength, and cost-effectiveness. It is ideal for components like engine blocks, pump casings, and brake discs.
Our sand molding lines can accommodate gray iron castings ranging from 5 kg up to 150 kg per piece, depending on the dimensional envelope and tooling layout.
We manage the carbon equivalent (CE) value, cooling rates, and inoculants to control graphite flake size and distribution (Type A flakes are preferred). Every melt is verified using wedge tests and tensile test bars.
Our shot-blasting and surface preparation processes meet ISO 8501-1 Sa 2.5 standards, ensuring a clean, scale-free surface ready for primer coating or machining.
Ready to Discuss Your
Casting Requirement?
Submit your drawings, CAD files, or technical specifications. Our engineering team reviews parting lines, gating flow paths, and metallurgical tolerances to return a comprehensive manufacturing proposal.
CAD & Drawing Review
Gating simulation feedback included with all technical proposals.
Material Grade Consultation
Expert support selecting optimal Gray or Spheroidal S.G. Iron grades.
Fast Technical Response
Full engineering-backed quotes delivered within 48 hours.