We are using below material in production for transfromer radiator fin 1.Steel plate: We choose DC01 and DC03 Plain carbon steel according to related requirements of GB/T5213 or other plates accordant with equivalent requirements. 2.Steel thickness: we have 1.0mm and 1.2mm according to customer requirements. But when the central distance is 3000m or longer, then the thickness of 1.2mm should be applied. 3.We use oil Q215, Q235 or welded steel pipe for low pressure service with highter performance which are acocordant with related requirements of GB/T 3091; and Grade 20 seamless steel pipes for liquid service which is accordant with from GB/T8163. The bore diameter of oil header should be 88.9mm (3inch) * 114.3mm (4inch) * 4.5mm. 4.Flange, we use Q235 steel with class A or Class B, in low temperature area (-20℃), pleasse use classB or higher performance steel which should be accordant with JB/T 5213 and related requirements. Products Range: Plate width 310,480,520,535mm Center Spacing 500-4000mm Number of pieces 10-42 nos Steel thickness 1.0mm or 1.2mm Painting Oil base panint/paint / Galvanizing/ galvanzing+finsh coat Type PC/PG/ BB