Superior Quality Gray Cast Iron Alloys
Unlike ductile iron, gray iron contains carbon in the form of long, narrow flakes. This is the main reason why gray iron is a little bit more breakable. Produce with 2.5% to 4% carbon, it can be alloy with other elements to produce specific alloys.
Common applications: mechanical components, housings, industrial molded parts, municipal equipment.
Advantages of Gray Cast Iron
- Good abrasion resistance depending the grade
- Dissipates heat quickly and evenly
- Excellent machinability
- Dissipates vibrations very well
- More cost-effective
Properties and Composition of Gray Cast Iron
Gray iron stands out for its excellent machinability depending of the grade. While it has lower impact resistance than ductile iron, it offers high compressive strength and abrasion resistance, making it suitable for industrial applications requiring precision and durability.
Gray Cast iron Mechanical Properties Table
| ASTM-A48 | Tensile Strength (psi) |
| 20 | 20 000 |
| 25 | 25 000 |
| 30 | 30 000 |
| 35 | 35 000 |
| 40 | 40 000 |
| 50 | 50 000 |
Gray Cast Iron Standards Equivalency Table
| American Norms | European Norms | |
| ASTM-A48 Cl20 | EN-GJL-150 | GG-15 |
| ASTM-A48 Cl25 | EN-GJL-200 | GG-20 |
| ASTM-A48 Cl30 | EN-GJL-250 | GG-25 |
| ASTM-A48 Cl35 | EN-GJL-300 | GG-30 |
| ASTM-A48 Cl40 | EN-GJL-350 | GG-35 |
| ASTM-A48 Cl50 | EN-GJL-400 | GG-40 |
Local Expertise and Personalized service
Produced and machined in Quebec, our gray iron combines local know-how with international standards.
- In-house certified quality control
- Technical guidance on alloy selection for your applications
- Fast delivery and support across the Canadian market
FAQ
What’s the difference between gray iron and ductile iron?
Gray iron has lower impact resistance but excellent machinability, whereas ductile iron offers higher ductility and crack resistance.
What are the main applications of gray iron?
complex industrial parts, mechanical, housing, casing, pumpe and municipal equipment.
Which ASTM standards apply to gray iron?
ASTM A-48 for grades CL 25 to CL 50, with DIN, EN, and ISO equivalents.
