MS Pipe vs DI Pipe — Comparison Guide

Mild Steel (MS) pipes and Ductile Iron (DI) pipes are both widely used for water transmission and distribution infrastructure. Each has distinct material properties, cost profiles, installation methods, and long-term maintenance characteristics that influence which is better suited for a specific project.

Key Differences

• Corrosion resistance: DI pipes have better inherent corrosion resistance; MS pipes need protective coatings
• Weight: MS pipes are lighter than DI for equivalent pressure ratings
• Cost: MS is generally less expensive than DI for large diameters above 500mm
• Availability: MS pipes available up to 2000mm; DI typically up to 1200mm
• Jointing: DI uses push-in rubber ring joints (faster); MS uses welded joints