Duct Iron Pipes Market Size, Share & Industry Analysis, By Diameter Size (mm) (DN 80-300, DN 301-600, DN 601-1000, DN 1001-1200, DN 1201-2000, DN 2000 and above), By Application (Wastewater supply/management, Irrigation, Others (Pumping stations)), By End-Use Industry (Oil & Gas, Agriculture, Water Treatment, Mining, Others) and Regional Forecast, 2025-2032