BS2789 Grade 500-7 SG Iron, also known as Spheroidal Graphite Iron (SG Iron) or Ductile Iron, is a high-strength cast iron widely used in industries requiring toughness, wear resistance, and excellent machinability. This grade is specified under the British Standard BS2789 and offers an ideal balance of strength and ductility, making it suitable for heavy-duty engineering applications.

What is SG Iron (Spheroidal Graphite Iron)?

Spheroidal Graphite Iron (SG Iron), also known as Ductile Iron, is a form of cast iron where the graphite is present in a spherical (nodular) form. This gives the material:

• Higher tensile strength compared to grey cast iron.
• Superior elongation and ductility, making it less brittle.
• Better shock absorption and impact resistance.
• Improved machinability and corrosion resistance.

The 500-7 designation refers to:

• 500 MPa minimum tensile strength.
• 7% minimum elongation after fracture.

Chemical Composition (Typical) 

Mechanical Properties of BS2789 Grade 500-7 SG Iron

These properties make 500-7 SG Iron both strong and ductile, suitable for dynamic load-bearing applications.

Applications of BS2789 500-7 SG Iron

BS2789 Grade 500-7 SG Iron is widely used across industries, including:

• Automotive Components – crankshafts, camshafts, gears, hubs, brake drums, wheel hubs.
• Heavy Engineering – machine bases, press frames, hydraulic components.
• Piping & Valves – pressure pipes, valve bodies, pump housings.
• Oil & Gas Industry – pipeline fittings, flanges, couplings.
• Construction & Mining – wear-resistant parts, crusher components, lifting equipment.
• General Machinery – gearboxes, couplings, shafts, spindles

Standards & Specifications

• British Standard: BS2789 Grade 500-7
• International Equivalents:
• EN-GJS-500-7 (EN 1563)
• GGG50 (DIN 1693)
• ASTM A536 70-50-05 (USA)

Forms Available: Bars, castings, machined parts, flanges, and custom components.

Advantages of BS2789 Grade 500-7 SG Iron

✔ Excellent balance of strength and ductility
✔ High wear resistance under dynamic loads
✔ Better corrosion resistance than grey cast iron
✔ Cost-effective compared to steel in many applications
✔ Superior machinability and castability
✔ Suitable for heat treatment for enhanced performance

Why Choose Nifty Alloys for BS2789 SG Iron in UAE?

At Nifty Alloys, we are a leading supplier of BS2789 Grade 500-7 SG Iron in Dubai, UAE.

• Wide stock availability in multiple forms (bars, castings, machined components).
• Custom sizes and machining services.
• Export supply to Middle East, GCC, and African markets.
• Competitive pricing with quality certification.
• Technical expertise to help clients choose the right grade.

Conclusion

BS2789 Grade 500-7 SG Iron offers an excellent combination of strength, toughness, and cost-effectiveness, making it the preferred choice for industries ranging from automotive to oil & gas. At Nifty Alloys, we provide high-quality SG Iron products with international standards compliance, ensuring reliable performance in demanding applications.

Contact our sales team today at +971 45 85 1015 or sales@niftyalloys.com to get a quote on BS2789 Grade 500-7 SG Iron.