1.Product Name:DN125 Twin Layer Boom Pipe,Concrete Pump Twin Layer Pipe 2.Material: ST52 /45mn2 3. Size: 4-8 inch 4. Standard: DN125 *4.5mm*3m/2m/1m,sk/zx/fm/HD/sided flange, wall thickness and length are customized 5.Painting and Welding:Electrostatic Spraying Epoxy Paint.Smooth Welding between straight pipes and flanges. Type Size Thickness Length(mm) Service time   ST52 Steel Pipe   DN125 (5”) 4.0mm